ISO 23150-15:2026

• Abstract:

  This document is applicable to road vehicles with automated driving functions and specifies the technology-specific logical interfaces for microphone sensors or sensor clusters: feature level interface; advanced detection level interface; detection level interface. This document does not provide electrical and mechanical interface specifications. Raw data interfaces are also excluded.

• Status: Published
• Publication Date: 28-Jun-2026
• ICS: 43.040.15 - Car informatics. On board computer systems
• Technical Committee: ISO/TC 22/SC 31 - Data communication
• Drafting Committee: ISO/TC 22/SC 31/WG 9 - Sensor data interface for automated driving functions
• Current Stage: 6060 - International Standard published
• Start Date: 29-Jun-2026
• Due Date: 09-Oct-2026
• Completion Date: 29-Jun-2026

• Revises: ISO 23150:2023 - Road vehicles — Data communication between sensors and data fusion unit for automated driving functions — Logical interface
• Effective Date: 28-Oct-2023

Overview

ISO 23150-15:2026 – "Road vehicles - Logical interface between sensors and data fusion unit for automated driving functions - Part 15: Microphone specific interfaces" – is an international standard developed by ISO for the automotive sector. This document defines the technology-specific logical interfaces for microphone sensors or sensor clusters in road vehicles equipped with automated driving functions. It standardizes logical data interfaces at the detection level, focusing on how microphone-derived information is logically structured and communicated to data fusion units that support automated driving features. The standard does not address electrical, mechanical, or raw data interfaces.

Key Topics

• Logical Interface Definition: Specifies the logical (software-level) interaction between microphone sensors/sensor clusters and data fusion units, enabling structured integration of auditory information into automated driving functions.
• Detection Level Interface: Outlines the interface structure for detecting and communicating recognized acoustic events, classification information, and contextual data (e.g., road condition or distance) from microphones.
• Sensor Data Profiles: Provides tailored profiles for handling microphone-specific outputs, such as road property classification, relative motion types (e.g., incoming/outgoing sound sources), and confidence metrics.
• Entity Status and Metadata: Supports reporting of detection statuses, confidences, time stamps, and metadata for acoustic events relevant to automated driving.
• Integration with ISO 23150 Series: Relies on the generic interface architecture and definitions in ISO 23150-1 and aligns with the modular design of the broader ISO 23150 series for multi-sensor data integration in autonomous vehicles.

Applications

• Automated and Autonomous Driving: Enables vehicles to perceive and interpret critical acoustic events (such as emergency vehicle sirens, honking, human interaction, or road noises), enhancing scene understanding required for safe automated actions.
• Sensor Fusion: Facilitates the integration of microphone sensor data with other perception sensors (radar, camera, lidar) as part of sophisticated data fusion systems in advanced driver assistance systems (ADAS) and automated driving.
• Event-based Decision Making: Supports robust detection and reliable interpretation of sound-based events imperative for vehicle response, such as yielding for emergency vehicles or responding to alerts from pedestrians and other road users.
• Standardized Interface Implementation: Assists automotive OEMs, sensor suppliers, and Tier 1 system integrators in designing interoperable systems for microphone-based perception, reducing development costs and increasing compatibility across platforms.
• Enhanced Diagnostics: Provides consistent and structured means for monitoring sensor performance and system health concerning the detection and classification of acoustic phenomena.

Related Standards

• ISO 23150-1:2026 – General principles and interface definitions for logical connections between sensors and data fusion units in automated driving functions.
• ISO 23150-2 – Object-level interfaces addressing higher-level perception data.
• ISO 23150-11, -12, -13, -14, -20 – Additional technology-specific parts in the ISO 23150 series for other sensor types and supportive interfaces (e.g., camera, lidar, radar).
• ISO/TC 22/SC 31 Data communication – Technical committee and subcommittee responsible for the ISO 23150 series.
• ISO 26262 – Safety standards framework for automotive E/E systems, often referenced in functional safety and integration contexts.

---

By standardizing logical interfaces for microphone sensors in automated driving, ISO 23150-15:2026 enhances the consistency, safety, and interoperability of sensor-rich automotive platforms. Stakeholders across the automotive supply chain benefit from improved integration, risk reduction, and faster innovation in deploying advanced perception capabilities for autonomous and highly automated vehicles.

International
Standard
ISO 23150-15
First edition
Road vehicles — Logical interface
2026-06
between sensors and data fusion
unit for automated driving
functions —
Part 15:
Microphone specific interfaces
Véhicules routiers — Interface logique entre capteurs et unité de
fusion de données pour les fonctions de conduite automatisée —
Partie 15: Interfaces spécifiques de microphone
Reference number
© ISO 2026
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
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or ISO’s member body in the country of the requester.
ISO copyright office
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CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 1
5 Feature level . 3
6 Advanced detection level . 3
7 Detection level . 3
7.1 Microphone detection interface .3
7.2 Microphone detection header .6
7.3 Microphone detection entity .7
7.4 Microphone detection profiles .8
7.4.1 Profile: microphone-specific road properties .8
Annex A (informative) Microphone interface signals . 9
Bibliography .15

iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
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in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
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http://www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 31, Data
communication.
[1] [2] [3]
This first edition of ISO 23150-15, together with ISO 23150-1 , ISO 23150-2 , ISO 23150-11 , ISO 23150-12
[4] [5] [6] [7]
, ISO 23150-13 , ISO 23150-14 and ISO 23150-20 , cancels and replaces ISO 23150:2023, which has
been technically revised.
The main changes are as follows:
— reorganisation of the document structure; use of generic interfaces, generic signals, generic profiles and
[1]
terms and definitions defined in ISO 23150-1 as a basis for this document;
— specific collection of interfaces in separated documents; in this document specific collection of all
technology specific interfaces for microphone;
— new logical interfaces for microphone detections.
A list of all parts in the ISO 23150 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iv
Introduction
Vehicle environmental perception sensors (single sensor or sensor cluster) provide logical interfaces
according to the ISO 23150 series to the fusion unit or automated driving functions. The fusion unit
generates a surround model and interprets the scene around the vehicle based on the sensor data. Interfaces
are defined on different levels and described in a modular and semantic representation. The interfaces
on feature level, advanced detection level and detection level are technology specific and differ by each
technology.
Figure 1 shows the schematic and contextual relationships between the documents relating to logical
interfaces of the ISO 23150 series.
Key
scope of this document
Figure 1 — Relationship of the ISO 23150 series
This document specifies technology specific interfaces for microphone sensors as well as sensor clusters.
[1]
The interfaces are based on the generic specifications of the interfaces in ISO 23150-1 . This document
references the generic specifications of signals for the interface header, the generic interface levels and the
profiles.
A microphone sensor or sensor cluster may also implement (provide or receive) logical interfaces:
[2]
— on object level (see ISO 23150-2 );
— for additional interfaces as supportive sensor interfaces and sensor input information interfaces (see
[7]
ISO 23150-20 ).
This document is not intended to replace the logical interface specifications of other documents in the
ISO 23150 series.
[1]
This document is based on the generic specifications in ISO 23150-1 as shown in Figure 2:
— generic sensor cluster feature interface;
— generic sensor advanced detection interface;
— generic sensor detection interface;
— general level-independent profiles.

v
Key
scope of this document
Figure 2 — Interfaces in the scope of this document and the related interfaces of the ISO 23150
series
vi
International Standard ISO 23150-15:2026(en)
Road vehicles — Logical interface between sensors and data
fusion unit for automated driving functions —
Part 15:
Microphone specific interfaces
1 Scope
This document is applicable to road vehicles with automated driving functions and specifies the technology-
specific logical interfaces for microphone sensors or sensor clusters:
— feature level interface;
— advanced detection level interface;
— detection level interface.
This document does not provide electrical and mechanical interface specifications. Raw data interfaces are
also excluded.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 23150-1, Road vehicles — Logical interface between sensors and data fusion unit for automated driving
functions — Part 1: General information and principles
ISO 23150-1:2026, Road vehicles — Logical interface between sensors and data fusion unit for automated
driving functions — Part 1: General information and principles
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 23150-1 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at http:// www .iso .org/ obp
4 Abbreviated terms
For the purposes of this document, the abbreviated terms given in ISO 23150-1 and the following apply.

A2I assign to interface
AD automated driving
ADLI advanced detection level interface
AER alternative entity representation
C conditional
CADI camera advanced detection interface
CDI camera detection interface
CFI camera feature interface
D dimensional
DE default enumerators
DLI detection level interface
ECU electronic control unit
EES extended enumeration signal
EM error model
FLI feature level interface
ID identifier
IQR interquartile range
IR infrared
IRI international roughness index
IV implicit value
LL list length
LSG logical signal group
M mandatory
MDI microphone detection interface
O optional
OLI object level interface
RL requirement level
SII sensor input interface
SSI supportive sensor interface
UTL unrolling tuple list
VRO value representation optimisation

5 Feature level
There is no FLI defined for microphone sensors or sensor clusters.
6 Advanced detection level
There is no ADLI defined for microphone sensors or sensor clusters.
7 Detection level
7.1 Microphone detection interface
The generic specification of the detection level interfaces is defined in ISO 23150-1:2026, Clause 10. The
microphone detection interface shall base on the generic sensor detection interface as specified in
ISO 23150-1:2026, 10.2. Table 1 provides the logical structure of the MDI.
Table 1 — Microphone detection interface structure
Structure Multiplicity Option
Microphone detection header (7.2) 1
Detections Multiple Size type:
dynamic/fixed
The logical structure of the MDI shall be implemented in accordance with the interface definition specified
[8]
in Table 2, the signals as defined in Annex A and ISO 23150-1:2026 , Annex A. Furthermore, the generic
[8]
profiles as defined in 7.4 and in ISO 23150-1:2026 as well as the signal options defined in ISO 23150-1:2026,
Annex B shall also be considered.
Table 2 — Microphone detection interface
RL LSG RL signal
LSG Signal Option
M/C/O M/C/O
Information: M Interface version ID {major, minor, M Profile: Uniqueness of
[8]
interface patch} (ISO 23150-1:2026 , A.1.2) interface versioning (ISO
[8]
23150-1:2026 , 6.5.1)
[8]
Interface ID (ISO 23150-1:2026 , A.1.3) O Profile: Uniqueness of
interface versioning (ISO
[8]
23150-1:2026 , 6.5.1)
Number of valid serving sensors (ISO M Profile: Uniqueness of
[8]
23150-1:2026 , A.1.4) interface versioning (ISO
[8]
23150-1:2026 , 6.5.1)
Optimise LL (ISO 23150-
[8]
1:2026 , B.1.2)
Alternative UTL (ISO
[8]
23150-1:2026 , B.1.7)
Key: Sensor ID (ISO 23150-
[8]
1:2026 , A.1.5)
Size type: dynamic/fixed
[8]
Size #: Number of valid serving sensors (ISO 23150-1:2026 , A.1.4)
[8]
Sensor ID (ISO 23150-1:2026 , M Profile: Uniqueness of
A.1.5) interface versioning (ISO
[8]
23150-1:2026 , 6.5.1)
Alternative VRO (ISO
[8]
23150-1:2026 , B.1.4)
Time stamp – measurement (ISO 23150- M
[8]
1:2026 , A.1.6.2)
TTabablele 2 2 ((ccoonnttiinnueuedd))
RL LSG RL signal
LSG Signal Option
M/C/O M/C/O
[8]
Cycle counter (ISO 23150-1:2026 , O Redundancy (ISO 23150-
[8]
A.1.7.1) 1:2026 , B.1.3)
Signal: Time stamp – meas-
urement (ISO 23150-1:2026
[8]
, A.1.6.2)
Interface cycle time (ISO 23150-1:2026 O
[8]
, A.1.8)
Interface cycle time – variation (ISO O
[8]
23150-1:2026 , A.1.9)
[8]
Data qualifier (ISO 23150-1:2026 , M Optimise DE (ISO 23150-
[8]
A.1.10) 1:2026 , B.1.8)
Optimise EES (ISO 23150-
[8]
1:2026 , B.1.9)
Detections
Detections M Recognised detections – capability (ISO O
[8]
information 23150-1:2026 , A.1.11.4)
Recognised detections – status (ISO O Redundancy (ISO 23150-
[8] [8]
23150-1:2026 , A.1.12.4) 1:2026 , B.1.3)
Signal: Recognised de-
tections – capability (ISO
[8]
23150-1:2026 , A.1.11.4)
Optimise DE (ISO 23150-
[8]
1:2026 , B.1.8)
Optimise EES (ISO 23150-
[8]
1:2026 , B.1.9)
Number of valid detections (ISO 23150- M Optimise LL (ISO 23150-
[8] [8]
1:2026 , A.1.13.4) 1:2026 , B.1.2)
Optimize AER (ISO 23150-
[8]
1:2026 , B.1.5)
Size type: dynamic/fixed
[8]
Size #: Number of valid detections (ISO 23150-1:2026 , A.1.13.4)
↪ Status M Existence probability – detection M
[8]
level (ISO 23150-1:2026 , A.6.2)
[8]
Detection ID (ISO 23150-1:2026 , O Alternative A2I (ISO 23150-
[8]
A.6.3) 1:2026 , B.3.3)
Object ID reference (ISO 23150- C (ISO 23150- Alternative A2I (ISO 23150-
[8] [8] [8]
1:2026 , A.2.69) 1:2026 , 1:2026 , B.3.3)
B.3.2)
Exist: OLI
Time stamp difference – detection M Optimise IV (ISO 23150-
[8] [8]
level (ISO 23150-1:2026 , A.6.4) 1:2026 , B.1.6)
↪ Information M Number of valid microphone detec- O Optimise LL (ISO 23150-
[8]
tion classifications (A.4.2) 1:2026 , B.1.2)
Alternative UTL (ISO
[8]
23150-1:2026 , B.1.7)
Key: Microphone detection
classification type (A.4.3)
Size type: dynamic/fixed
Size #: Number of valid microphone detection classifications (A.4.2)

TTabablele 2 2 ((ccoonnttiinnueuedd))
RL LSG RL signal
LSG Signal Option
M/C/O M/C/O
Microphone detection classifica- M Alternative VRO (ISO
[8]
tion type (A.4.3) 23150-1:2026 , B.1.4)
Optimise DE (ISO 23150-
[8]
1:2026 , B.1.8)
Optimise EES (ISO 23150-
[8]
1:2026 , B.1.9)
Road property type (ISO 23150- O Profile: Microphone specific
[8]
1:2026 , A.2.54) road properties (7.4.1)
Optimise DE (ISO 23150-
[8]
1:2026 , B.1.8)
Optimise EES (ISO 23150-
[8]
1:2026 , B.1.9)
Road surface condition classifica- O Profile: Microphone specific
[8]
tion type (ISO 23150-1:2026 , road properties (7.4.1)
A.2.55)
Optimise DE (ISO 23150-
[8]
1:2026 , B.1.8)
Optimise EES (ISO 23150-
[8]
1:2026 , B.1.9)
Road surface feature (ISO 23150- O Profile: Microphone specific
[8]
1:2026 , A.2.56) road properties (7.4.1)
Optimise DE (ISO 23150-
[8]
1:2026 , B.1.8)
Optimise EES (ISO 23150-
[8]
1:2026 , B.1.9)
Number of valid microphone de- M Optimise LL (ISO 23150-
[8]
tection model types (A.4.4) 1:2026 , B.1.2)
Alternative UTL (ISO
[8]
23150-1:2026 , B.1.7)
Key: Microphone detection
model type (A.4.5)
Size type: dynamic/fixed
Size #: Number of valid microphone detection model types (A.4.4)
Microphone detection model M Alternative VRO (ISO
[8]
type (A.4.5) 23150-1:2026 , B.1.4)
Optimise DE (ISO 23150-
[8]
1:2026 , B.1.8)
Optimise EES (ISO 23150-
[8]
1:2026 , B.1.9)
Microphone detection clas- M
sification type – confidence
(A.4.6)
↪ State O Relative motion type (A.4.7) M
Relative motion type – confidence M
(A.4.8)
Microphone detection distance C (ISO 23150- Optimise IV (ISO 23150-
[8] [8]
threshold value (A.4.9) 1:2026 , 1:2026 , B.1.6)
B.2.3)
Signal: Micro-
phone detection
distance range
(A.4.10)
TTabablele 2 2 ((ccoonnttiinnueuedd))
RL LSG RL signal
LSG Signal Option
M/C/O M/C/O
Microphone detection distance range O Optimise DE (ISO 23150-
[8]
(A.4.10) 1:2026 , B.1.8)
Optimise EES (ISO 23150-
[8]
1:2026 , B.1.9)
Microphone detection distance range C (ISO 23150-
[8]
– confidence (A.4.11) 1:2026 ,
B.2.3)
Signal: Micro-
phone detection
distance range
(A.4.10)
Number of valid microphone detec- O Optimise LL (ISO 23150-
[8]
tion direction segments (A.4.12) 1:2026 , B.1.2)
Alternative UTL (ISO
[8]
23150-1:2026 , B.1.7)
Key: Segment azimuth
{begin, end} (A.4.13)
Size type: dynamic/fixed
Size #: Number of valid microphone detection direction segments (A.4.12)
Segment azimuth {begin, end} M Alternative VRO (ISO
[8]
(A.4.13) 23150-1:2026 , B.1.4)
Blockage status (A.4.14) M Optimise DE (ISO 23150-
[8]
1:2026 , B.1.8)
Optimise EES (ISO 23150-
[8]
1:2026 , B.1.9)
Microphone detection – confi- M
dence (A.4.15)
Noise floor (A.4.16) O
Signal to noise ratio (ISO 23150- M Profile: Signal to noise
[8] [8]
1:2026 , A.2.66) ratio (ISO 23150-1:2026 ,
6.5.17)
DEPRECATED: Signal to noise O Profile: Signal to noise
[8]
ratio – error (ISO 23150-1:2026 ratio (ISO 23150-1:2026 ,
[8]
, A.2.67) 6.5.17)
Implementation EM (ISO
[8]
23150-1:2026 , B.4.2)
7.2 Microphone detection header
Table 3 defines the interface header for microphone detetions and the changes due to the adaptation in
comparison to the "generic sensor detection header" as specified in ISO 23150-1:2026, 10.3, which shall be
used as the interface header. The header of the MDI specifies the list of valid microphone detection entities
(see 7.3).
Table 3 — Specific signal grouping: microphone detection header
Signal RL signal Option
Interface version ID {major, minor, patch} (ISO Mandatory Profile: Uniqueness of interface versioning
[8] [8]
23150-1:2026 , A.1.2) (ISO 23150-1:2026 , 6.5.1)
[8]
Interface ID (ISO 23150-1:2026 , A.1.3) Optional Profile: Uniqueness of interface versioning
[8]
(ISO 23150-1:2026 , 6.5.1)
a [8]
Further signals of "need of logical signal group" (ISO 23150-1:2026 , B.3.4) profiles may be added to this header (see cell
options).
TTabablele 3 3 ((ccoonnttiinnueuedd))
Signal RL signal Option
Number of valid serving sensors (IS
...