SIST EN 300 175-8 V2.9.1:2022
(Main)Digital Enhanced Cordless Telecommunications (DECT) - Common Interface (CI) - Part 8: Speech and audio coding and transmission
General Information
- Abstract
The present document is one of the parts of the specification of the Digital Enhanced Cordless Telecommunications
(DECT) Common Interface (CI).
This part of the DECT CI specifies the speech and audio coding and transmission requirements.
In order to ensure satisfactory interworking of different portable and fixed units, it is necessary to specify the
transmission performance of the analog information over the digital link. This requires not only use of a common
speech algorithm, but also standardization of frequency responses, reference speech levels (or loudness) at the air
interface and various other parameters.
The present document applies to DECT equipment which includes all the necessary functions to provide real-time
two-way speech conversation and stereo audio transmission. Several speech services are defined in the present
document, including conventional 3,1 kHz telephony, wideband 7 kHz voice transmission, super-wideband 14 kHz and
fullband 20 kHz service. DECT Fixed part providing such services may be connected to the public circuit switched
(PSTN/ISDN) network, to private networks or to the Voice over Internet Protocol (VoIP) network.
Tethered fixed point local loop applications are not required to comply with the requirements of the present document.
For the DECT systems which connect to the Public Switched Telephone Network (PSTN) via an analog interface, the
additional requirements, which are implemented in the FP, have as much as possible been aligned with ETSI
TBR 038 [29].
A summary of the control and the use of the DECT echo control functions, to guide on need for options to
manufacturers and installers, is found in annex A.
Information concerning test methods can be found in ETSI EN 300 176-1 [9] and ETSI EN 300 176-2 [10] (previously
covered by ETSI TBR 010 [i.5]). The test methods take into account that DECT is a digital system.
The present document includes New Generation DECT, a further development of the DECT standard introducing
wideband speech, improved data services, new slot types and other technical enhancements.
In addition, the present document includes DECT Evolution, providing SWB and FB speech and audio capabilities and
a new speech coding algorithm for NB and WB allowing to increase the audio quality of the NB and WB speech service
and improve bandwidth efficiency.
The latest update for DECT Evolution includes the support of ultra-band, high resolution, low-latency speech and audio
coding, and additional PP types supported with LC3plus coding. An application profile using these new PP types can be
found in ETSI TS 103 706 [i.28].
- Status
- Published
- Public Enquiry End Date
- 22-Mar-2022
- Publication Date
- 05-Apr-2022
- Technical Committee
- MOC - Mobile Communications
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 04-Apr-2022
- Due Date
- 09-Jun-2022
- Completion Date
- 06-Apr-2022
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ETSI EN 300 175-8 V2.8.5 (2021-12) - Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 8: Speech and audio coding and transmission
ETSI EN 300 175-8 V2.9.1 (2022-03) - Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 8: Speech and audio coding and transmission
Overview
SIST EN 300 175-8 V2.9.1:2022 focuses on the Digital Enhanced Cordless Telecommunications (DECT) - Common Interface (CI) - Part 8: Speech and Audio Coding and Transmission. Published by SIST, this standard specifies the requirements for speech and audio coding, as well as transmission, within DECT systems. The document forms a key component in ensuring interoperability, quality, and performance of speech and audio services among various DECT portable and fixed units.
This part outlines the necessary parameters for transmission performance of analog information across a digital DECT link. It ensures that all DECT equipment supporting real-time two-way speech conversation and stereo audio transmission adheres to specified criteria for successful operation in professional and consumer environments.
Key Topics
Speech and Audio Codec Standardization: The standard prescribes various codecs and algorithms to guarantee consistent speech and audio quality. It addresses conventional narrowband telephony (3.1 kHz), wideband (7 kHz), super-wideband (14 kHz), and fullband (20 kHz) services, ensuring devices can support a wide range of quality levels.
Transmission and Frequency Response Requirements: SIST EN 300 175-8 sets the frequency response and reference loudness levels at the DECT air interface. This standardization is crucial for cross-device compatibility and maintaining high audio performance.
Interworking with Networks: The standard supports DECT systems that connect to public switched telephone networks (PSTN/ISDN), private networks, and Voice over Internet Protocol (VoIP) networks, ensuring adaptable deployment scenarios.
Audio Types and Device Profiles: It defines various device profiles for portable parts (PP) such as handsets, headsets, and handsfree units, as well as fixed parts (FP) with multiple network interfaces. The standard covers enhanced audio device types, including those supporting advanced low-latency or ultra-band (high resolution) codecs.
DECT Evolution and New Generation DECT: The document incorporates new technical enhancements such as wideband, super-wideband, and fullband audio, improved data services, additional slot types, and advanced speech coding algorithms.
Best Practices and Echo Control: Annexes provide guidance for manufacturers and installers on implementing and controlling DECT echo management functions.
Applications
SIST EN 300 175-8 is applicable to:
DECT Handsets, Headsets, and Base Stations: Manufacturers designing equipment for residential, business, or industrial applications benefit from consistent audio quality and robust interoperability.
Voice Communication Systems: Ensures that DECT-based systems, whether standalone or integrated with PSTN, ISDN, or VoIP networks, provide high-quality two-way speech and stereo audio.
Advanced Audio Devices: Supports development of devices requiring wideband, super-wideband, fullband, or ultra-band audio for use in conferencing, telemedicine, broadcast, or handsfree communication.
Cross-Network Interconnectivity: Facilitates the reliable operation of DECT devices across diverse digital and analog infrastructures, supporting both legacy and modern telecommunication environments.
Related Standards
- ETSI EN 300 175 Series: The broader suite of DECT Common Interface standards, detailing physical and protocol layers for the DECT air interface.
- ETSI TBR 038: Requirements aligned with analog interface connections to PSTN.
- ETSI EN 300 176-1 & EN 300 176-2: Define test methods for verifying DECT speech and audio equipment compliance, considering DECT’s digital nature.
- ETSI TS 103 706: Provides application profiles for devices adopting new DECT profiles, including support for advanced codecs like LC3plus.
Keywords: DECT, digital cordless, speech codec, audio transmission, wideband, super-wideband, fullband, ultra-band, handsfree, telephony, VoIP, interoperability, codec standard, audio quality, SIST, ETSI, fixed part, portable part.
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ETSI EN 300 175-8 V2.8.5 (2021-12) - Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 8: Speech and audio coding and transmission
ETSI EN 300 175-8 V2.9.1 (2022-03) - Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 8: Speech and audio coding and transmission
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Frequently Asked Questions
SIST EN 300 175-8 V2.9.1:2022 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Digital Enhanced Cordless Telecommunications (DECT) - Common Interface (CI) - Part 8: Speech and audio coding and transmission". This standard covers: The present document is one of the parts of the specification of the Digital Enhanced Cordless Telecommunications (DECT) Common Interface (CI). This part of the DECT CI specifies the speech and audio coding and transmission requirements. In order to ensure satisfactory interworking of different portable and fixed units, it is necessary to specify the transmission performance of the analog information over the digital link. This requires not only use of a common speech algorithm, but also standardization of frequency responses, reference speech levels (or loudness) at the air interface and various other parameters. The present document applies to DECT equipment which includes all the necessary functions to provide real-time two-way speech conversation and stereo audio transmission. Several speech services are defined in the present document, including conventional 3,1 kHz telephony, wideband 7 kHz voice transmission, super-wideband 14 kHz and fullband 20 kHz service. DECT Fixed part providing such services may be connected to the public circuit switched (PSTN/ISDN) network, to private networks or to the Voice over Internet Protocol (VoIP) network. Tethered fixed point local loop applications are not required to comply with the requirements of the present document. For the DECT systems which connect to the Public Switched Telephone Network (PSTN) via an analog interface, the additional requirements, which are implemented in the FP, have as much as possible been aligned with ETSI TBR 038 [29]. A summary of the control and the use of the DECT echo control functions, to guide on need for options to manufacturers and installers, is found in annex A. Information concerning test methods can be found in ETSI EN 300 176-1 [9] and ETSI EN 300 176-2 [10] (previously covered by ETSI TBR 010 [i.5]). The test methods take into account that DECT is a digital system. The present document includes New Generation DECT, a further development of the DECT standard introducing wideband speech, improved data services, new slot types and other technical enhancements. In addition, the present document includes DECT Evolution, providing SWB and FB speech and audio capabilities and a new speech coding algorithm for NB and WB allowing to increase the audio quality of the NB and WB speech service and improve bandwidth efficiency. The latest update for DECT Evolution includes the support of ultra-band, high resolution, low-latency speech and audio coding, and additional PP types supported with LC3plus coding. An application profile using these new PP types can be found in ETSI TS 103 706 [i.28].
The present document is one of the parts of the specification of the Digital Enhanced Cordless Telecommunications (DECT) Common Interface (CI). This part of the DECT CI specifies the speech and audio coding and transmission requirements. In order to ensure satisfactory interworking of different portable and fixed units, it is necessary to specify the transmission performance of the analog information over the digital link. This requires not only use of a common speech algorithm, but also standardization of frequency responses, reference speech levels (or loudness) at the air interface and various other parameters. The present document applies to DECT equipment which includes all the necessary functions to provide real-time two-way speech conversation and stereo audio transmission. Several speech services are defined in the present document, including conventional 3,1 kHz telephony, wideband 7 kHz voice transmission, super-wideband 14 kHz and fullband 20 kHz service. DECT Fixed part providing such services may be connected to the public circuit switched (PSTN/ISDN) network, to private networks or to the Voice over Internet Protocol (VoIP) network. Tethered fixed point local loop applications are not required to comply with the requirements of the present document. For the DECT systems which connect to the Public Switched Telephone Network (PSTN) via an analog interface, the additional requirements, which are implemented in the FP, have as much as possible been aligned with ETSI TBR 038 [29]. A summary of the control and the use of the DECT echo control functions, to guide on need for options to manufacturers and installers, is found in annex A. Information concerning test methods can be found in ETSI EN 300 176-1 [9] and ETSI EN 300 176-2 [10] (previously covered by ETSI TBR 010 [i.5]). The test methods take into account that DECT is a digital system. The present document includes New Generation DECT, a further development of the DECT standard introducing wideband speech, improved data services, new slot types and other technical enhancements. In addition, the present document includes DECT Evolution, providing SWB and FB speech and audio capabilities and a new speech coding algorithm for NB and WB allowing to increase the audio quality of the NB and WB speech service and improve bandwidth efficiency. The latest update for DECT Evolution includes the support of ultra-band, high resolution, low-latency speech and audio coding, and additional PP types supported with LC3plus coding. An application profile using these new PP types can be found in ETSI TS 103 706 [i.28].
SIST EN 300 175-8 V2.9.1:2022 is classified under the following ICS (International Classification for Standards) categories: 33.070.30 - Digital Enhanced Cordless Telecommunications (DECT); 35.040.40 - Coding of audio, video, multimedia and hypermedia information. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 300 175-8 V2.9.1:2022 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
Draft ETSI EN 300 175-8 V2.8.5 (2021-12)
EUROPEAN STANDARD
Digital Enhanced Cordless Telecommunications (DECT);
Common Interface (CI);
Part 8: Speech and audio coding and transmission
2 Draft ETSI EN 300 175-8 V2.8.5 (2021-12)
Reference
REN/DECT-00358
Keywords
7 kHz, audio, broadband, codec, DECT, handsfree,
IMT-2000, loudspeaking, mobility, narrowband,
quality, radio, speech, TDD, TDMA, telephony,
terminal
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ETSI
3 Draft ETSI EN 300 175-8 V2.8.5 (2021-12)
Contents
Intellectual Property Rights . 17
Foreword . 17
Modal verbs terminology . 17
1 Scope . 18
2 References . 18
2.1 Normative references . 18
2.2 Informative references . 20
3 Definition of terms, symbols and abbreviations . 22
3.1 Terms . 22
3.2 Symbols . 24
3.3 Abbreviations . 24
4 Configurations . 26
4.1 Reference configuration . 26
4.1.1 Basic configuration . 26
4.1.2 Portable Part (PP) . 27
4.1.2.1 Functional organization . 27
4.1.2.2 Volume control . 28
4.1.3 Fixed Part (FP) . 28
4.1.3.1 Digital interface . 28
4.1.3.2 Analog interface . 29
4.1.3.3 FP adaptive volume control . 30
4.1.3.4 Voice over IP (VoIP) interface . 30
4.2 Test configurations . 31
5 Encoding . 31
5.0 General . 31
5.1 32 kbit/s full term (ADPCM) G.726 . 31
5.1.1 Algorithm . 31
5.1.2 Bit sequence . 31
5.1.3 Characteristics of G.726 ADPCM codec . 31
5.2 64 kbit/s PCM G.711 . 32
5.2.1 Algorithm . 32
5.2.2 Bit sequence . 32
5.2.3 Characteristics of G.711 PCM codec . 32
5.2.4 Automatic detection of FAX/modem tone and switch to G.711 . 32
5.3 Wideband speech codec G.722 at 64 kbit/s . 32
5.3.0 General . 32
5.3.1 Algorithm . 32
5.3.2 Bit sequence . 33
5.3.3 Characteristics of G.722 wideband codec . 33
5.3.4 Optional Packet Loss Concealment algorithm (PLC) . 33
5.4 Wideband speech codec G.729.1 up to 32 kbit/s . 34
5.4.1 Algorithm . 34
5.4.2 Bit sequence . 34
5.4.3 Characteristics of G.729.1 codec . 34
5.4.4 Packet Loss Concealment algorithm (PLC) . 34
5.4.5 Supported bit rate in DECT . 35
5.5 Super-wideband MPEG-4 speech and audio coding . 35
5.5.1 Algorithm . 35
5.5.2 64 kbit/s, MPEG-4 ER AAC-LD codec . 35
5.5.3 32 kbit/s, MPEG-4 ER AAC-LD codec . 36
5.6 Narrowband, wideband, super-wideband, fullband, FBHR and ultra-band LC3plus speech and audio
coding . 36
5.6.1 Algorithm . 36
5.6.2 NB mode at 32 kbit/s gross bit rate and 10 ms frame size . 37
ETSI
4 Draft ETSI EN 300 175-8 V2.8.5 (2021-12)
5.6.3 WB mode at 32 kbit/s gross bit rate and 10 ms frame size . 37
5.6.4 SWB mode at 64 kbit/s gross bit rate and 10 ms frame size . 38
5.6.5 FB mode at 64 kbit/s gross bit rate and 10 ms frame size . 38
5.6.6 FB mode at 96 kbit/s gross bit rate and 10 ms frame size . 38
5.6.7 FB mode at 128 kbit/s gross bit rate and 10 ms frame size . 39
5.6.8 FB mode at 128 kbit/s gross bit rate and 5 ms frame size . 39
5.6.9 FB mode at 160 kbit/s gross bit rate and 5 ms frame size . 39
5.6.10 FB mode at 192 kbit/s gross bit rate and 5 ms frame size . 40
5.6.11 FB mode at 128 kbit/s gross bit rate and 2,5 ms frame size . 40
5.6.12 FB mode at 256 kbit/s gross bit rate and 2,5 ms frame size . 40
5.6.13 FBLFE mode at 32 kbit/s gross bit rate and 10 ms frame size . 40
5.6.14 FBLFE mode at 64 kbit/s gross bit rate and 5 ms frame size . 41
5.6.15 FB stereo mode at 128 kbit/s gross bit rate and 10 ms frame size . 41
5.6.16 FB stereo mode at 256 kbit/s gross bit rate and 5 ms frame size . 41
5.6.17 FB stereo mode at 320 kbit/s gross bit rate and 2,5 ms frame size . 41
5.6.18 FB stereo mode at 512 kbit/s gross bit rate and 2,5 ms frame size . 42
5.6.19 FBHR mode at 128 kbit/s gross bit rate and 10 ms frame size . 42
5.6.20 FBHR mode at 160 kbit/s gross bit rate and 10 ms frame size . 42
5.6.21 FBHR mode at 192 kbit/s gross bit rate and 10 ms frame size . 42
5.6.22 UBHR mode at 160 kbit/s gross bit rate and 10 ms frame size. 43
5.6.23 UBHR mode at 192 kbit/s gross bit rate and 10 ms frame size. 43
5.6.24 UBHR mode at 256 kbit/s gross bit rate and 10 ms frame size. 43
5.6.25 UBHR mode at 320 kbit/s gross bit rate and 10 ms frame size. 43
6 Transmission aspects . 44
6.1 Relative level . 44
6.2 Acoustic reference level . 44
6.3 Volume control . 44
7 Audio specifications . 44
7.1 Overall description . 44
7.1.1 Introduction to DECT audio specifications . 44
7.1.2 Introduction to the audio types . 44
7.1.3 List of Audio types . 45
7.1.4 Audio types for Portable Parts . 46
7.1.5 Audio types for Fixed Parts . 47
7.1.6 Complete DECT system . 47
7.1.7 Structure of the specification of the audio types . 48
7.1.8 Audio Types and codecs . 56
7.1.9 Audio Types and physical interfaces . 56
7.2 Audio types applicable to Portable Parts . 56
7.2.0 General . 56
7.2.1 Performance levels of DECT Portable Parts (handsets). 56
7.2.2 Type 0: Reference PP (RePP) . 58
7.2.3 PP Type 1a: "Classic" GAP narrowband handset . 58
7.2.3.1 Introduction . 58
7.2.3.2 Compatible services and codecs . 58
7.2.3.3 Specification. 58
7.2.4 PP Type 1b: "Improved" GAP narrowband handset . 59
7.2.4.1 Introduction . 59
7.2.4.2 Compatible services and codecs . 59
7.2.4.3 Specification. 59
7.2.5 PP Type 1c: HATS-tested "standard" narrowband handset . 59
7.2.5.1 Introduction . 59
7.2.5.2 Compatible services and codecs . 59
7.2.5.3 Specification. 59
7.2.6 PP Type 1d: HATS-tested "improved" narrowband handset . 60
7.2.6.1 Introduction . 60
7.2.6.2 Compatible services and codecs . 60
7.2.6.3 Specification. 60
7.2.7 PP Type 3a: HATS tested narrowband "standard" loudspeaking handsfree . 60
7.2.7.1 Introduction . 60
ETSI
5 Draft ETSI EN 300 175-8 V2.8.5 (2021-12)
7.2.7.2 Compatible services and codecs . 61
7.2.7.3 Specification. 61
7.2.8 PP Type 3b: HATS tested narrowband "improved" loudspeaking handsfree . 61
7.2.8.1 Introduction . 61
7.2.8.2 Compatible services and codecs . 61
7.2.8.3 Specification. 61
7.2.9 PP Type 2a: P.311-tested wideband handset. 61
7.2.9.1 Introduction . 61
7.2.9.2 Compatible services and codecs . 61
7.2.9.3 Specification. 61
7.2.10 PP Type 2b: HATS-tested "standard" wideband handset or headset . 62
7.2.10.1 Introduction . 62
7.2.10.2 Compatible services and codecs . 62
7.2.10.3 Specification. 62
7.2.11 PP Type 2c: HATS tested "improved" wideband handset or headset . 62
7.2.11.1 Introduction . 62
7.2.11.2 Compatible services and codecs . 62
7.2.11.3 Specification. 62
7.2.12 PP Type 4a: HATS tested wideband "standard" loudspeaking handsfree . 63
7.2.12.1 Introduction . 63
7.2.12.2 Compatible services and codecs . 63
7.2.12.3 Specification. 63
7.2.13 PP Type 4b: HATS tested wideband "improved" loudspeaking and handsfree . 63
7.2.13.1 Introduction . 63
7.2.13.2 Compatible services and codecs . 63
7.2.13.3 Specification. 63
7.2.14 PP Type 5a: super-wideband 14 kHz handset or headset. 64
7.2.14.1 Introduction . 64
7.2.14.2 Compatible services and codecs . 64
7.2.14.3 Specification. 64
7.2.15 PP Type 5b: super-wideband 14 kHz loudspeaking handsfree . 64
7.2.15.1 Introduction . 64
7.2.15.2 Compatible services and codecs . 64
7.2.15.3 Specification. 64
7.2.16 PP Type 6: PPs with external 2 wire, 3,1 kHz telephony interface . 64
7.2.16.1 Introduction . 64
7.2.16.2 Compatible services and codecs . 64
7.2.16.3 Specification. 64
7.2.17 PP Type 7a: fullband 20 kHz handset or headset . 64
7.2.17.1 Introduction . 64
7.2.17.2 Compatible services and codecs . 65
7.2.17.3 Specification. 65
7.2.18 PP Type 7b: fullband 20 kHz loudspeaking handsfree . 65
7.2.18.1 Introduction . 65
7.2.18.2 Compatible services and codecs . 65
7.2.18.3 Specification. 65
7.2.19 PP Type 7c, d, e, f: fullband 20 kHz stereo audio device . 65
7.2.19.1 Introduction . 65
7.2.19.2 Compatible services and codecs . 65
7.2.19.3 Specification. 65
7.2.20 PP Type 7g: FBHR 24 kHz headset device . 66
7.2.20.1 Introduction . 66
7.2.20.2 Compatible services and codecs . 66
7.2.20.3 Specification. 66
7.2.21 PP Type 7h: FBHR 24 kHz loudspeaking device . 66
7.2.21.1 Introduction . 66
7.2.21.2 Compatible services and codecs . 66
7.2.21.3 Specification. 66
7.2.22 PP Type 7i: FBLFE 250 Hz loudspeaking device . 66
7.2.22.1 Introduction . 66
7.2.22.2 Compatible services and codecs . 66
7.2.22.3 Specification. 66
ETSI
6 Draft ETSI EN 300 175-8 V2.8.5 (2021-12)
7.2.23 PP Type 7j: fullband 20 kHz low-latency microphone device . 66
7.2.23.1 Introduction . 66
7.2.23.2 Compatible services and codecs . 66
7.2.23.3 Specification. 67
7.2.24 PP type 8a: ultra-band 48 kHz headset device . 67
7.2.24.1 Introduction . 67
7.2.24.2 Compatible services and codecs . 67
7.2.24.3 Specification. 67
7.2.25 PP type 8b: ultra-band 48 kHz loudspeaking device . 67
7.2.25.1 Introduction . 67
7.2.25.2 Compatible services and codecs . 67
7.2.25.3 Specification. 67
7.3 Audio transmission types applicable to Fixed Parts . 67
7.3.0 General . 67
7.3.1 FP Type 0: Reference FP (ReFP) . 68
7.3.2 FP Type 1a: "classical" Fixed Part for ISDN Network . 68
7.3.2.1 Introduction . 68
7.3.2.2 Compatible services and codecs . 68
7.3.2.3 Specifications . 69
7.3.2.3.1 Transcoding and equalization . 69
7.3.2.3.2 PP type detection . 69
7.3.2.3.3 Activation of audio processing functions . 69
7.3.2.3.4 Transmission specification . 69
7.3.3 FP Type 1b: Fixed Part for ISDN Network . 70
7.3.3.1 Introduction . 70
7.3.3.2 Compatible services and codecs . 70
7.3.3.3 Specification. 70
7.3.3.3.1 Transcoding and equalization . 70
7.3.3.3.2 PP type detection . 70
7.3.3.3.3 Activation of audio processing functions . 71
7.3.3.3.4 Transmission specification . 71
7.3.4 FP Type 2: FP with analog 2-wire interface, 3,1 kHz service . 71
7.3.4.1 Introduction . 71
7.3.4.2 Compatible services, physical interfaces and codecs . 71
7.3.4.3 Specification. 72
7.3.4.3.1 Transcoding, equalization and conversion . 72
7.3.4.3.2 PP type detection and activation of audio processing functions . 72
7.3.4.3.3 Transmission specification . 72
7.3.5 FP Type 3: VoIP narrowband Fixed Part . 72
7.3.5.1 Introduction . 72
7.3.5.2 Compatible services, physical interfaces and codecs . 72
7.3.5.3 Specification. 73
7.3.5.3.1 Transcoding and equalization . 73
7.3.5.3.2 PP type detection . 73
7.3.5.3.3 Activation of audio processing functions . 74
7.3.5.3.4 Transmission specification . 74
7.3.6 FP Type 4: ISDN wideband Fixed Part . 74
7.3.6.1 Introduction . 74
7.3.6.2 Compatible services and codecs . 74
7.3.6.3 Specification. 75
7.3.6.3.1 Transcoding and equalization . 75
7.3.6.3.2 PP type detection . 75
7.3.6.3.3 Activation of audio processing functions . 75
7.3.6.3.4 Transmission specification . 75
7.3.7 FP Type 5: VoIP wideband, super-wideband, FBHR, fullband or ultra-band Fixed Part . 76
7.3.7.1 Introduction . 76
7.3.7.2 Compatible services, physical interfaces and codecs . 76
7.3.7.3 Specification. 76
7.3.7.3.1 Transcoding and equalization . 76
7.3.7.3.2 PP type detection . 77
7.3.7.3.3 Activation of audio processing functions . 77
7.3.7.3.4 Transmission specification . 77
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7 Draft ETSI EN 300 175-8 V2.8.5 (2021-12)
7.3.8 FP Type 6a: FP handling an Internal call inside a DECT FP (any service) . 78
7.3.8.1 Introduction . 78
7.3.8.2 Compatible services, physical interfaces and codecs . 78
7.3.8.3 Specification. 78
7.3.9 FP Type 6b: FP handling an n-party conference inside a DECT FP (any service) . 78
7.3.9.1 Introduction . 78
7.3.9.2 Compatible services, physical interfaces and codecs . 78
7.3.9.3 Specification for the conference bridge. 78
7.3.10 FP Type 7: DECT Repeater Part (REP) . 79
7.3.10.1 Introduction . 79
7.3.10.2 Compatible services, physical interfaces and codecs . 79
7.3.10.3 Specification. 79
7.4 Additional features . 79
7.4.1 Introduction. 79
7.4.2 Echo canceller in Fixed Part . 80
7.4.3 Echo suppressor in Fixed Part. 80
7.5 Transmission characteristics for Portable Parts . 81
7.5.1 Transmission characteristics for Portable Part type 1a ("Classic GAP" handset) . 81
7.5.1.1 PP frequency responses . 81
7.5.1.1.1 Sending . 81
7.5.1.1.2 Receiving . 81
7.5.1.2 PP sending and receiving loudness ratings . 82
7.5.1.2.1 Nominal values . 82
7.5.1.2.2 User-controlled volume control in PP . 82
7.5.1.2.3 PP adaptive volume control . 83
7.5.1.3 Sidetone . 83
7.5.1.3.1 Talker sidetone . 83
7.5.1.3.2 Listener sidetone . 83
7.5.1.4 Terminal coupling loss . 84
7.5.1.4.1 Weighted T
...
EUROPEAN STANDARD
Digital Enhanced Cordless Telecommunications (DECT);
Common Interface (CI);
Part 8: Speech and audio coding and transmission
2 ETSI EN 300 175-8 V2.9.1 (2022-03)
Reference
REN/DECT-00358
Keywords
7 kHz, audio, broadband, codec, DECT, handsfree,
IMT-2000, loudspeaking, mobility, narrowband,
quality, radio, speech, TDD, TDMA, telephony,
terminal
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE
Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16
Siret N° 348 623 562 00017 - APE 7112B
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° w061004871
Important notice
The present document can be downloaded from:
http://www.etsi.org/standards-search
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the prevailing version of an ETSI
deliverable is the one made publicly available in PDF format at www.etsi.org/deliver.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
https://portal.etsi.org/TB/ETSIDeliverableStatus.aspx
If you find errors in the present document, please send your comment to one of the following services:
https://portal.etsi.org/People/CommiteeSupportStaff.aspx
If you find a security vulnerability in the present document, please report it through our
Coordinated Vulnerability Disclosure Program:
https://www.etsi.org/standards/coordinated-vulnerability-disclosure
Notice of disclaimer & limitation of liability
The information provided in the present deliverable is directed solely to professionals who have the appropriate degree of
experience to understand and interpret its content in accordance with generally accepted engineering or
other professional standard and applicable regulations.
No recommendation as to products and services or vendors is made or should be implied.
In no event shall ETSI be held liable for loss of profits or any other incidental or consequential damages.
Any software contained in this deliverable is provided "AS IS" with no warranties, express or implied, including but not
limited to, the warranties of merchantability, fitness for a particular purpose and non-infringement of intellectual property
rights and ETSI shall not be held liable in any event for any damages whatsoever (including, without limitation, damages
for loss of profits, business interruption, loss of information, or any other pecuniary loss) arising out of or related to the use
of or inability to use the software.
Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.
© ETSI 2022.
All rights reserved.
ETSI
3 ETSI EN 300 175-8 V2.9.1 (2022-03)
Contents
Intellectual Property Rights . 16
Foreword . 16
Modal verbs terminology . 16
1 Scope . 17
2 References . 17
2.1 Normative references . 17
2.2 Informative references . 19
3 Definition of terms, symbols and abbreviations . 21
3.1 Terms . 21
3.2 Symbols . 23
3.3 Abbreviations . 23
4 Configurations . 25
4.1 Reference configuration . 25
4.1.1 Basic configuration . 25
4.1.2 Portable Part (PP) . 26
4.1.2.1 Functional organization . 26
4.1.2.2 Volume control . 27
4.1.3 Fixed Part (FP) . 27
4.1.3.1 Digital interface . 27
4.1.3.2 Analog interface . 28
4.1.3.3 FP adaptive volume control . 29
4.1.3.4 Voice over IP (VoIP) interface . 29
4.2 Test configurations . 30
5 Encoding . 30
5.0 General . 30
5.1 32 kbit/s full term (ADPCM) G.726 . 30
5.1.1 Algorithm . 30
5.1.2 Bit sequence . 30
5.1.3 Characteristics of G.726 ADPCM codec . 30
5.2 64 kbit/s PCM G.711 . 31
5.2.1 Algorithm . 31
5.2.2 Bit sequence . 31
5.2.3 Characteristics of G.711 PCM codec . 31
5.2.4 Automatic detection of FAX/modem tone and switch to G.711 . 31
5.3 Wideband speech codec G.722 at 64 kbit/s . 31
5.3.0 General . 31
5.3.1 Algorithm . 31
5.3.2 Bit sequence . 32
5.3.3 Characteristics of G.722 wideband codec . 32
5.3.4 Optional Packet Loss Concealment algorithm (PLC) . 32
5.4 Wideband speech codec G.729.1 up to 32 kbit/s . 33
5.4.1 Algorithm . 33
5.4.2 Bit sequence . 33
5.4.3 Characteristics of G.729.1 codec . 33
5.4.4 Packet Loss Concealment algorithm (PLC) . 33
5.4.5 Supported bit rate in DECT . 34
5.5 Super-wideband MPEG-4 speech and audio coding . 34
5.5.1 Algorithm . 34
5.5.2 64 kbit/s, MPEG-4 ER AAC-LD codec . 34
5.5.3 32 kbit/s, MPEG-4 ER AAC-LD codec . 35
5.6 Narrowband, wideband, super-wideband, fullband, FBHR and ultra-band LC3plus speech and audio
coding . 35
5.6.1 Algorithm . 35
5.6.2 NB mode at 32 kbit/s gross bit rate and 10 ms frame size . 36
ETSI
4 ETSI EN 300 175-8 V2.9.1 (2022-03)
5.6.3 WB mode at 32 kbit/s gross bit rate and 10 ms frame size . 36
5.6.4 SWB mode at 64 kbit/s gross bit rate and 10 ms frame size . 37
5.6.5 FB mode at 64 kbit/s gross bit rate and 10 ms frame size . 37
5.6.6 FB mode at 96 kbit/s gross bit rate and 10 ms frame size . 37
5.6.7 FB mode at 128 kbit/s gross bit rate and 10 ms frame size . 38
5.6.8 FB mode at 128 kbit/s gross bit rate and 5 ms frame size . 38
5.6.9 FB mode at 160 kbit/s gross bit rate and 5 ms frame size . 38
5.6.10 FB mode at 192 kbit/s gross bit rate and 5 ms frame size . 39
5.6.11 FB mode at 128 kbit/s gross bit rate and 2,5 ms frame size . 39
5.6.12 FB mode at 256 kbit/s gross bit rate and 2,5 ms frame size . 39
5.6.13 FBLFE mode at 32 kbit/s gross bit rate and 10 ms frame size . 39
5.6.14 FBLFE mode at 64 kbit/s gross bit rate and 5 ms frame size . 40
5.6.15 FB stereo mode at 128 kbit/s gross bit rate and 10 ms frame size . 40
5.6.16 FB stereo mode at 256 kbit/s gross bit rate and 5 ms frame size . 40
5.6.17 FB stereo mode at 320 kbit/s gross bit rate and 2,5 ms frame size . 40
5.6.18 FB stereo mode at 512 kbit/s gross bit rate and 2,5 ms frame size . 41
5.6.19 FBHR mode at 128 kbit/s gross bit rate and 10 ms frame size . 41
5.6.20 FBHR mode at 160 kbit/s gross bit rate and 10 ms frame size . 41
5.6.21 FBHR mode at 192 kbit/s gross bit rate and 10 ms frame size . 41
5.6.22 UBHR mode at 160 kbit/s gross bit rate and 10 ms frame size. 42
5.6.23 UBHR mode at 192 kbit/s gross bit rate and 10 ms frame size. 42
5.6.24 UBHR mode at 256 kbit/s gross bit rate and 10 ms frame size. 42
5.6.25 UBHR mode at 320 kbit/s gross bit rate and 10 ms frame size. 42
6 Transmission aspects . 43
6.1 Relative level . 43
6.2 Acoustic reference level . 43
6.3 Volume control . 43
7 Audio specifications . 43
7.1 Overall description . 43
7.1.1 Introduction to DECT audio specifications . 43
7.1.2 Introduction to the audio types . 43
7.1.3 List of Audio types . 44
7.1.4 Audio types for Portable Parts . 45
7.1.5 Audio types for Fixed Parts . 46
7.1.6 Complete DECT system . 46
7.1.7 Structure of the specification of the audio types . 47
7.1.8 Audio Types and codecs . 55
7.1.9 Audio Types and physical interfaces . 55
7.2 Audio types applicable to Portable Parts . 55
7.2.0 General . 55
7.2.1 Performance levels of DECT Portable Parts (handsets). 55
7.2.2 Type 0: Reference PP (RePP) . 57
7.2.3 PP Type 1a: "Classic" GAP narrowband handset . 57
7.2.3.1 Introduction . 57
7.2.3.2 Compatible services and codecs . 57
7.2.3.3 Specification. 57
7.2.4 PP Type 1b: "Improved" GAP narrowband handset . 58
7.2.4.1 Introduction . 58
7.2.4.2 Compatible services and codecs . 58
7.2.4.3 Specification. 58
7.2.5 PP Type 1c: HATS-tested "standard" narrowband handset . 58
7.2.5.1 Introduction . 58
7.2.5.2 Compatible services and codecs . 58
7.2.5.3 Specification. 58
7.2.6 PP Type 1d: HATS-tested "improved" narrowband handset . 59
7.2.6.1 Introduction . 59
7.2.6.2 Compatible services and codecs . 59
7.2.6.3 Specification. 59
7.2.7 PP Type 3a: HATS tested narrowband "standard" loudspeaking handsfree . 59
7.2.7.1 Introduction . 59
ETSI
5 ETSI EN 300 175-8 V2.9.1 (2022-03)
7.2.7.2 Compatible services and codecs . 60
7.2.7.3 Specification. 60
7.2.8 PP Type 3b: HATS tested narrowband "improved" loudspeaking handsfree . 60
7.2.8.1 Introduction . 60
7.2.8.2 Compatible services and codecs . 60
7.2.8.3 Specification. 60
7.2.9 PP Type 2a: P.311-tested wideband handset. 60
7.2.9.1 Introduction . 60
7.2.9.2 Compatible services and codecs . 60
7.2.9.3 Specification. 60
7.2.10 PP Type 2b: HATS-tested "standard" wideband handset or headset . 61
7.2.10.1 Introduction . 61
7.2.10.2 Compatible services and codecs . 61
7.2.10.3 Specification. 61
7.2.11 PP Type 2c: HATS tested "improved" wideband handset or headset . 61
7.2.11.1 Introduction . 61
7.2.11.2 Compatible services and codecs . 61
7.2.11.3 Specification. 61
7.2.12 PP Type 4a: HATS tested wideband "standard" loudspeaking handsfree . 62
7.2.12.1 Introduction . 62
7.2.12.2 Compatible services and codecs . 62
7.2.12.3 Specification. 62
7.2.13 PP Type 4b: HATS tested wideband "improved" loudspeaking and handsfree . 62
7.2.13.1 Introduction . 62
7.2.13.2 Compatible services and codecs . 62
7.2.13.3 Specification. 62
7.2.14 PP Type 5a: super-wideband 14 kHz handset or headset. 63
7.2.14.1 Introduction . 63
7.2.14.2 Compatible services and codecs . 63
7.2.14.3 Specification. 63
7.2.15 PP Type 5b: super-wideband 14 kHz loudspeaking handsfree . 63
7.2.15.1 Introduction . 63
7.2.15.2 Compatible services and codecs . 63
7.2.15.3 Specification. 63
7.2.16 PP Type 6: PPs with external 2 wire, 3,1 kHz telephony interface . 63
7.2.16.1 Introduction . 63
7.2.16.2 Compatible services and codecs . 63
7.2.16.3 Specification. 63
7.2.17 PP Type 7a: fullband 20 kHz handset or headset . 63
7.2.17.1 Introduction . 63
7.2.17.2 Compatible services and codecs . 64
7.2.17.3 Specification. 64
7.2.18 PP Type 7b: fullband 20 kHz loudspeaking handsfree . 64
7.2.18.1 Introduction . 64
7.2.18.2 Compatible services and codecs . 64
7.2.18.3 Specification. 64
7.2.19 PP Type 7c, d, e, f: fullband 20 kHz stereo audio device . 64
7.2.19.1 Introduction . 64
7.2.19.2 Compatible services and codecs . 64
7.2.19.3 Specification. 64
7.2.20 PP Type 7g: FBHR 24 kHz headset device . 65
7.2.20.1 Introduction . 65
7.2.20.2 Compatible services and codecs . 65
7.2.20.3 Specification. 65
7.2.21 PP Type 7h: FBHR 24 kHz loudspeaking device . 65
7.2.21.1 Introduction . 65
7.2.21.2 Compatible services and codecs . 65
7.2.21.3 Specification. 65
7.2.22 PP Type 7i: FBLFE 250 Hz loudspeaking device . 65
7.2.22.1 Introduction . 65
7.2.22.2 Compatible services and codecs . 65
7.2.22.3 Specification. 65
ETSI
6 ETSI EN 300 175-8 V2.9.1 (2022-03)
7.2.23 PP Type 7j: fullband 20 kHz low-latency microphone device . 65
7.2.23.1 Introduction . 65
7.2.23.2 Compatible services and codecs . 65
7.2.23.3 Specification. 66
7.2.24 PP type 8a: ultra-band 48 kHz headset device . 66
7.2.24.1 Introduction . 66
7.2.24.2 Compatible services and codecs . 66
7.2.24.3 Specification. 66
7.2.25 PP type 8b: ultra-band 48 kHz loudspeaking device . 66
7.2.25.1 Introduction . 66
7.2.25.2 Compatible services and codecs . 66
7.2.25.3 Specification. 66
7.3 Audio transmission types applicable to Fixed Parts . 66
7.3.0 General . 66
7.3.1 FP Type 0: Reference FP (ReFP) . 67
7.3.2 FP Type 1a: "classical" Fixed Part for ISDN Network . 67
7.3.2.1 Introduction . 67
7.3.2.2 Compatible services and codecs . 67
7.3.2.3 Specifications . 68
7.3.2.3.1 Transcoding and equalization . 68
7.3.2.3.2 PP type detection . 68
7.3.2.3.3 Activation of audio processing functions . 68
7.3.2.3.4 Transmission specification . 68
7.3.3 FP Type 1b: Fixed Part for ISDN Network . 69
7.3.3.1 Introduction . 69
7.3.3.2 Compatible services and codecs . 69
7.3.3.3 Specification. 69
7.3.3.3.1 Transcoding and equalization . 69
7.3.3.3.2 PP type detection . 69
7.3.3.3.3 Activation of audio processing functions . 70
7.3.3.3.4 Transmission specification . 70
7.3.4 FP Type 2: FP with analog 2-wire interface, 3,1 kHz service . 70
7.3.4.1 Introduction . 70
7.3.4.2 Compatible services, physical interfaces and codecs . 70
7.3.4.3 Specification. 71
7.3.4.3.1 Transcoding, equalization and conversion . 71
7.3.4.3.2 PP type detection and activation of audio processing functions . 71
7.3.4.3.3 Transmission specification . 71
7.3.5 FP Type 3: VoIP narrowband Fixed Part . 71
7.3.5.1 Introduction . 71
7.3.5.2 Compatible services, physical interfaces and codecs . 71
7.3.5.3 Specification. 72
7.3.5.3.1 Transcoding and equalization . 72
7.3.5.3.2 PP type detection . 72
7.3.5.3.3 Activation of audio processing functions . 73
7.3.5.3.4 Transmission specification . 73
7.3.6 FP Type 4: ISDN wideband Fixed Part . 73
7.3.6.1 Introduction . 73
7.3.6.2 Compatible services and codecs . 73
7.3.6.3 Specification. 74
7.3.6.3.1 Transcoding and equalization . 74
7.3.6.3.2 PP type detection . 74
7.3.6.3.3 Activation of audio processing functions . 74
7.3.6.3.4 Transmission specification . 74
7.3.7 FP Type 5: VoIP wideband, super-wideband, FBHR, fullband or ultra-band Fixed Part . 75
7.3.7.1 Introduction . 75
7.3.7.2 Compatible services, physical interfaces and codecs . 75
7.3.7.3 Specification. 75
7.3.7.3.1 Transcoding and equalization . 75
7.3.7.3.2 PP type detection . 76
7.3.7.3.3 Activation of audio processing functions . 76
7.3.7.3.4 Transmission specification . 76
ETSI
7 ETSI EN 300 175-8 V2.9.1 (2022-03)
7.3.8 FP Type 6a: FP handling an Internal call inside a DECT FP (any service) . 77
7.3.8.1 Introduction . 77
7.3.8.2 Compatible services, physical interfaces and codecs . 77
7.3.8.3 Specification. 77
7.3.9 FP Type 6b: FP handling an n-party conference inside a DECT FP (any service) . 77
7.3.9.1 Introduction . 77
7.3.9.2 Compatible services, physical interfaces and codecs . 77
7.3.9.3 Specification for the conference bridge. 77
7.3.10 FP Type 7: DECT Repeater Part (REP) . 78
7.3.10.1 Introduction . 78
7.3.10.2 Compatible services, physical interfaces and codecs . 78
7.3.10.3 Specification. 78
7.4 Additional features . 78
7.4.1 Introduction. 78
7.4.2 Echo canceller in Fixed Part . 79
7.4.3 Echo suppressor in Fixed Part. 79
7.5 Transmission characteristics for Portable Parts . 80
7.5.1 Transmission characteristics for Portable Part type 1a ("Classic GAP" handset) . 80
7.5.1.1 PP frequency responses . 80
7.5.1.1.1 Sending . 80
7.5.1.1.2 Receiving . 80
7.5.1.2 PP sending and receiving loudness ratings . 81
7.5.1.2.1 Nominal values . 81
7.5.1.2.2 User-controlled volume control in PP . 81
7.5.1.2.3 PP adaptive volume control . 82
7.5.1.3 Sidetone . 82
7.5.1.3.1 Talker sidetone . 82
7.5.1.3.2 Listener sidetone . 82
7.5.1
...
SLOVENSKI STANDARD
01-maj-2022
Digitalne izboljšane brezvrvične telekomunikacije (DECT) - Skupni vmesnik (CI) - 8.
del: Kodiranje in prenos govora in zvoka
Digital Enhanced Cordless Telecommunications (DECT) - Common Interface (CI) - Part
8: Speech and audio coding and transmission
Ta slovenski standard je istoveten z: ETSI EN 300 175-8 V2.9.1 (2022-03)
ICS:
33.070.30 Digitalne izboljšane Digital Enhanced Cordless
brezvrvične telekomunikacije Telecommunications (DECT)
(DECT)
35.040.40 Kodiranje avdio, video, Coding of audio, video,
multimedijskih in multimedia and hypermedia
hipermedijskih informacij information
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
Digital Enhanced Cordless Telecommunications (DECT);
Common Interface (CI);
Part 8: Speech and audio coding and transmission
2 ETSI EN 300 175-8 V2.9.1 (2022-03)
Reference
REN/DECT-00358
Keywords
7 kHz, audio, broadband, codec, DECT, handsfree,
IMT-2000, loudspeaking, mobility, narrowband,
quality, radio, speech, TDD, TDMA, telephony,
terminal
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE
Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16
Siret N° 348 623 562 00017 - APE 7112B
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° w061004871
Important notice
The present document can be downloaded from:
http://www.etsi.org/standards-search
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the prevailing version of an ETSI
deliverable is the one made publicly available in PDF format at www.etsi.org/deliver.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
https://portal.etsi.org/TB/ETSIDeliverableStatus.aspx
If you find errors in the present document, please send your comment to one of the following services:
https://portal.etsi.org/People/CommiteeSupportStaff.aspx
If you find a security vulnerability in the present document, please report it through our
Coordinated Vulnerability Disclosure Program:
https://www.etsi.org/standards/coordinated-vulnerability-disclosure
Notice of disclaimer & limitation of liability
The information provided in the present deliverable is directed solely to professionals who have the appropriate degree of
experience to understand and interpret its content in accordance with generally accepted engineering or
other professional standard and applicable regulations.
No recommendation as to products and services or vendors is made or should be implied.
In no event shall ETSI be held liable for loss of profits or any other incidental or consequential damages.
Any software contained in this deliverable is provided "AS IS" with no warranties, express or implied, including but not
limited to, the warranties of merchantability, fitness for a particular purpose and non-infringement of intellectual property
rights and ETSI shall not be held liable in any event for any damages whatsoever (including, without limitation, damages
for loss of profits, business interruption, loss of information, or any other pecuniary loss) arising out of or related to the use
of or inability to use the software.
Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.
© ETSI 2022.
All rights reserved.
ETSI
3 ETSI EN 300 175-8 V2.9.1 (2022-03)
Contents
Intellectual Property Rights . 16
Foreword . 16
Modal verbs terminology . 16
1 Scope . 17
2 References . 17
2.1 Normative references . 17
2.2 Informative references . 19
3 Definition of terms, symbols and abbreviations . 21
3.1 Terms . 21
3.2 Symbols . 23
3.3 Abbreviations . 23
4 Configurations . 25
4.1 Reference configuration . 25
4.1.1 Basic configuration . 25
4.1.2 Portable Part (PP) . 26
4.1.2.1 Functional organization . 26
4.1.2.2 Volume control . 27
4.1.3 Fixed Part (FP) . 27
4.1.3.1 Digital interface . 27
4.1.3.2 Analog interface . 28
4.1.3.3 FP adaptive volume control . 29
4.1.3.4 Voice over IP (VoIP) interface . 29
4.2 Test configurations . 30
5 Encoding . 30
5.0 General . 30
5.1 32 kbit/s full term (ADPCM) G.726 . 30
5.1.1 Algorithm . 30
5.1.2 Bit sequence . 30
5.1.3 Characteristics of G.726 ADPCM codec . 30
5.2 64 kbit/s PCM G.711 . 31
5.2.1 Algorithm . 31
5.2.2 Bit sequence . 31
5.2.3 Characteristics of G.711 PCM codec . 31
5.2.4 Automatic detection of FAX/modem tone and switch to G.711 . 31
5.3 Wideband speech codec G.722 at 64 kbit/s . 31
5.3.0 General . 31
5.3.1 Algorithm . 31
5.3.2 Bit sequence . 32
5.3.3 Characteristics of G.722 wideband codec . 32
5.3.4 Optional Packet Loss Concealment algorithm (PLC) . 32
5.4 Wideband speech codec G.729.1 up to 32 kbit/s . 33
5.4.1 Algorithm . 33
5.4.2 Bit sequence . 33
5.4.3 Characteristics of G.729.1 codec . 33
5.4.4 Packet Loss Concealment algorithm (PLC) . 33
5.4.5 Supported bit rate in DECT . 34
5.5 Super-wideband MPEG-4 speech and audio coding . 34
5.5.1 Algorithm . 34
5.5.2 64 kbit/s, MPEG-4 ER AAC-LD codec . 34
5.5.3 32 kbit/s, MPEG-4 ER AAC-LD codec . 35
5.6 Narrowband, wideband, super-wideband, fullband, FBHR and ultra-band LC3plus speech and audio
coding . 35
5.6.1 Algorithm . 35
5.6.2 NB mode at 32 kbit/s gross bit rate and 10 ms frame size . 36
ETSI
4 ETSI EN 300 175-8 V2.9.1 (2022-03)
5.6.3 WB mode at 32 kbit/s gross bit rate and 10 ms frame size . 36
5.6.4 SWB mode at 64 kbit/s gross bit rate and 10 ms frame size . 37
5.6.5 FB mode at 64 kbit/s gross bit rate and 10 ms frame size . 37
5.6.6 FB mode at 96 kbit/s gross bit rate and 10 ms frame size . 37
5.6.7 FB mode at 128 kbit/s gross bit rate and 10 ms frame size . 38
5.6.8 FB mode at 128 kbit/s gross bit rate and 5 ms frame size . 38
5.6.9 FB mode at 160 kbit/s gross bit rate and 5 ms frame size . 38
5.6.10 FB mode at 192 kbit/s gross bit rate and 5 ms frame size . 39
5.6.11 FB mode at 128 kbit/s gross bit rate and 2,5 ms frame size . 39
5.6.12 FB mode at 256 kbit/s gross bit rate and 2,5 ms frame size . 39
5.6.13 FBLFE mode at 32 kbit/s gross bit rate and 10 ms frame size . 39
5.6.14 FBLFE mode at 64 kbit/s gross bit rate and 5 ms frame size . 40
5.6.15 FB stereo mode at 128 kbit/s gross bit rate and 10 ms frame size . 40
5.6.16 FB stereo mode at 256 kbit/s gross bit rate and 5 ms frame size . 40
5.6.17 FB stereo mode at 320 kbit/s gross bit rate and 2,5 ms frame size . 40
5.6.18 FB stereo mode at 512 kbit/s gross bit rate and 2,5 ms frame size . 41
5.6.19 FBHR mode at 128 kbit/s gross bit rate and 10 ms frame size . 41
5.6.20 FBHR mode at 160 kbit/s gross bit rate and 10 ms frame size . 41
5.6.21 FBHR mode at 192 kbit/s gross bit rate and 10 ms frame size . 41
5.6.22 UBHR mode at 160 kbit/s gross bit rate and 10 ms frame size. 42
5.6.23 UBHR mode at 192 kbit/s gross bit rate and 10 ms frame size. 42
5.6.24 UBHR mode at 256 kbit/s gross bit rate and 10 ms frame size. 42
5.6.25 UBHR mode at 320 kbit/s gross bit rate and 10 ms frame size. 42
6 Transmission aspects . 43
6.1 Relative level . 43
6.2 Acoustic reference level . 43
6.3 Volume control . 43
7 Audio specifications . 43
7.1 Overall description . 43
7.1.1 Introduction to DECT audio specifications . 43
7.1.2 Introduction to the audio types . 43
7.1.3 List of Audio types . 44
7.1.4 Audio types for Portable Parts . 45
7.1.5 Audio types for Fixed Parts . 46
7.1.6 Complete DECT system . 46
7.1.7 Structure of the specification of the audio types . 47
7.1.8 Audio Types and codecs . 55
7.1.9 Audio Types and physical interfaces . 55
7.2 Audio types applicable to Portable Parts . 55
7.2.0 General . 55
7.2.1 Performance levels of DECT Portable Parts (handsets). 55
7.2.2 Type 0: Reference PP (RePP) . 57
7.2.3 PP Type 1a: "Classic" GAP narrowband handset . 57
7.2.3.1 Introduction . 57
7.2.3.2 Compatible services and codecs . 57
7.2.3.3 Specification. 57
7.2.4 PP Type 1b: "Improved" GAP narrowband handset . 58
7.2.4.1 Introduction . 58
7.2.4.2 Compatible services and codecs . 58
7.2.4.3 Specification. 58
7.2.5 PP Type 1c: HATS-tested "standard" narrowband handset . 58
7.2.5.1 Introduction . 58
7.2.5.2 Compatible services and codecs . 58
7.2.5.3 Specification. 58
7.2.6 PP Type 1d: HATS-tested "improved" narrowband handset . 59
7.2.6.1 Introduction . 59
7.2.6.2 Compatible services and codecs . 59
7.2.6.3 Specification. 59
7.2.7 PP Type 3a: HATS tested narrowband "standard" loudspeaking handsfree . 59
7.2.7.1 Introduction . 59
ETSI
5 ETSI EN 300 175-8 V2.9.1 (2022-03)
7.2.7.2 Compatible services and codecs . 60
7.2.7.3 Specification. 60
7.2.8 PP Type 3b: HATS tested narrowband "improved" loudspeaking handsfree . 60
7.2.8.1 Introduction . 60
7.2.8.2 Compatible services and codecs . 60
7.2.8.3 Specification. 60
7.2.9 PP Type 2a: P.311-tested wideband handset. 60
7.2.9.1 Introduction . 60
7.2.9.2 Compatible services and codecs . 60
7.2.9.3 Specification. 60
7.2.10 PP Type 2b: HATS-tested "standard" wideband handset or headset . 61
7.2.10.1 Introduction . 61
7.2.10.2 Compatible services and codecs . 61
7.2.10.3 Specification. 61
7.2.11 PP Type 2c: HATS tested "improved" wideband handset or headset . 61
7.2.11.1 Introduction . 61
7.2.11.2 Compatible services and codecs . 61
7.2.11.3 Specification. 61
7.2.12 PP Type 4a: HATS tested wideband "standard" loudspeaking handsfree . 62
7.2.12.1 Introduction . 62
7.2.12.2 Compatible services and codecs . 62
7.2.12.3 Specification. 62
7.2.13 PP Type 4b: HATS tested wideband "improved" loudspeaking and handsfree . 62
7.2.13.1 Introduction . 62
7.2.13.2 Compatible services and codecs . 62
7.2.13.3 Specification. 62
7.2.14 PP Type 5a: super-wideband 14 kHz handset or headset. 63
7.2.14.1 Introduction . 63
7.2.14.2 Compatible services and codecs . 63
7.2.14.3 Specification. 63
7.2.15 PP Type 5b: super-wideband 14 kHz loudspeaking handsfree . 63
7.2.15.1 Introduction . 63
7.2.15.2 Compatible services and codecs . 63
7.2.15.3 Specification. 63
7.2.16 PP Type 6: PPs with external 2 wire, 3,1 kHz telephony interface . 63
7.2.16.1 Introduction . 63
7.2.16.2 Compatible services and codecs . 63
7.2.16.3 Specification. 63
7.2.17 PP Type 7a: fullband 20 kHz handset or headset . 63
7.2.17.1 Introduction . 63
7.2.17.2 Compatible services and codecs . 64
7.2.17.3 Specification. 64
7.2.18 PP Type 7b: fullband 20 kHz loudspeaking handsfree . 64
7.2.18.1 Introduction . 64
7.2.18.2 Compatible services and codecs . 64
7.2.18.3 Specification. 64
7.2.19 PP Type 7c, d, e, f: fullband 20 kHz stereo audio device . 64
7.2.19.1 Introduction . 64
7.2.19.2 Compatible services and codecs . 64
7.2.19.3 Specification. 64
7.2.20 PP Type 7g: FBHR 24 kHz headset device . 65
7.2.20.1 Introduction . 65
7.2.20.2 Compatible services and codecs . 65
7.2.20.3 Specification. 65
7.2.21 PP Type 7h: FBHR 24 kHz loudspeaking device . 65
7.2.21.1 Introduction . 65
7.2.21.2 Compatible services and codecs . 65
7.2.21.3 Specification. 65
7.2.22 PP Type 7i: FBLFE 250 Hz loudspeaking device . 65
7.2.22.1 Introduction . 65
7.2.22.2 Compatible services and codecs . 65
7.2.22.3 Specification. 65
ETSI
6 ETSI EN 300 175-8 V2.9.1 (2022-03)
7.2.23 PP Type 7j: fullband 20 kHz low-latency microphone device . 65
7.2.23.1 Introduction . 65
7.2.23.2 Compatible services and codecs . 65
7.2.23.3 Specification. 66
7.2.24 PP type 8a: ultra-band 48 kHz headset device . 66
7.2.24.1 Introduction . 66
7.2.24.2 Compatible services and codecs . 66
7.2.24.3 Specification. 66
7.2.25 PP type 8b: ultra-band 48 kHz loudspeaking device . 66
7.2.25.1 Introduction . 66
7.2.25.2 Compatible services and codecs . 66
7.2.25.3 Specification. 66
7.3 Audio transmission types applicable to Fixed Parts . 66
7.3.0 General . 66
7.3.1 FP Type 0: Reference FP (ReFP) . 67
7.3.2 FP Type 1a: "classical" Fixed Part for ISDN Network . 67
7.3.2.1 Introduction . 67
7.3.2.2 Compatible services and codecs . 67
7.3.2.3 Specifications . 68
7.3.2.3.1 Transcoding and equalization . 68
7.3.2.3.2 PP type detection . 68
7.3.2.3.3 Activation of audio processing functions . 68
7.3.2.3.4 Transmission specification . 68
7.3.3 FP Type 1b: Fixed Part for ISDN Network . 69
7.3.3.1 Introduction . 69
7.3.3.2 Compatible services and codecs . 69
7.3.3.3 Specification. 69
7.3.3.3.1 Transcoding and equalization . 69
7.3.3.3.2 PP type detection . 69
7.3.3.3.3 Activation of audio processing functions . 70
7.3.3.3.4 Transmission specification . 70
7.3.4 FP Type 2: FP with analog 2-wire interface, 3,1 kHz service . 70
7.3.4.1 Introduction . 70
7.3.4.2 Compatible services, physical interfaces and codecs . 70
7.3.4.3 Specification. 71
7.3.4.3.1 Transcoding, equalization and conversion . 71
7.3.4.3.2 PP type detection and activation of audio processing functions . 71
7.3.4.3.3 Transmission specification . 71
7.3.5 FP Type 3: VoIP narrowband Fixed Part . 71
7.3.5.1 Introduction . 71
7.3.5.2 Compatible services, physical interfaces and codecs . 71
7.3.5.3 Specification. 72
7.3.5.3.1 Transcoding and equalization . 72
7.3.5.3.2 PP type detection . 72
7.3.5.3.3 Activation of audio processing functions . 73
7.3.5.3.4 Transmission specification . 73
7.3.6 FP Type 4: ISDN wideband Fixed Part . 73
7.3.6.1 Introduction . 73
7.3.6.2 Compatible services and codecs . 73
7.3.6.3 Specification. 74
7.3.6.3.1 Transcoding and equalization . 74
7.3.6.3.2 PP type detection . 74
7.3.6.3.3 Activation of audio processing functions . 74
7.3.6.3.4 Transmission specification . 74
7.3.7 FP Type 5: VoIP wideband, super-wideband, FBHR, fullband or ultra-band Fixed Part . 75
7.3.7.1 Introduction . 75
7.3.7.2 Compatible services, physical interfaces and codecs . 75
7.3.7.3 Specification. 75
7.3.7.3.1 Transcoding and equalization . 75
7.3.7.3.2 PP type detection . 76
7.3.7.3.3 Activation of audio processing functions . 76
7.3.7.3.4 Transmission specification . 76
ETSI
7 ETSI EN 300 175-8 V2.9.1 (2022-03)
7.3.8 FP Type 6a: FP handling an Internal call inside a DECT FP (any service) . 77
7.3.8.1 Introduction . 77
7.3.8.2 Compatible services, physical interfaces and codecs . 77
7.3.8.3 Specification. 77
7.3.9 FP Type 6b: FP handling an n-party conference inside a DECT FP (any service) . 77
7.3.9.1 Introduction . 77
7.3.9.2 Compatible services, physical interfaces and codecs . 77
7.3.9.3 Specification for the conference bridge. 77
7.3.10 FP Type 7: DECT Repeater Part (REP) . 78
7.3.10.1 Introduction . 78
7.3.10.2 Compatible services, physical interfaces and codecs . 78
7.3.10.3 Specification. 78
7.4 Additional features . 78
7.4.1 Introduction. 78
7.4.2 Echo canceller in Fixed Part . 79
7.4.3 Echo suppressor in Fixed Part. 79
7.5 Transmission characteristics for Portable Parts . 80
7.5.1 Transmission characteristics for Portable Part type 1a ("Classic GAP" handset) . 80
7.5.1.1 PP frequency responses . 80
7.5.1.1.1 Sending . 80
7.5.1.1.2 Receiving .
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