GB/T 45314-2025 Road vehicles - Performance requirements and test methods for hands free communication and voice interaction
1 Scope
This document specifies the performance requirements and test methods for hands-free communication and voice interaction of road vehicles.
This document is applicable to Categories M1 and N1 vehicles equipped with on-board speaker hands-free communication terminal, emergency communication terminal and voice interaction terminal.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions 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.
ITU-T G.122-1993 Influence of national systems on stability and talker echo in international connections
ITU-T P.51 Artificial mouth
ITU-T P.57 Artificial ears
ITU-T P.58 Head and torso simulator for telephonometry, HATS
ITU-T P.79-2007 Calculation of loudness ratings for telephone sets
ITU-T P.501-2020 Test signals for use intelephonometry
ITU-T P.502-2000 Objective test methods for speech communication systems using complex test signals
ITU-T P.863.1-2019 Application guide for recommendation P.863
ETSI EG202 396-3-2018 Speech and multimedia Transmission Quality (STQ); Speech Quality performance in the presence of background noise; Part 3: Background noise transmission - Objective test methods
ETSI TS103 558-2020 Speech and multimedia Transmission Quality (STQ); Methods for objective evaluation of listening effort
ETSI TS103 802-2023 Speech and multimedia Transmission Quality (STQ); Objective test method for the evaluation of echo impairments
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
system simulator
device for simulating a mobile communication network, equipped with a radio interface on one side and receiving/sending electrical input/output interface on the other side
3.2
device under test; DUT
device to be tested
Note: Refer to Categories M1 and N1 vehicles equipped with on-board speaker hands-free communication terminal, emergency communication terminal and voice interaction terminal.
3.3
codec
device or software that has encoding and decoding functions in digital communication
[Source: ITU-T P.1100-2019, 3.2.2]
3.4
narrowband speech
transmission frequency band covering voice services of at least 300Hz~3,400Hz
3.5
wideband speech
transmission frequency band covering voice services of at least 150Hz~7,000Hz
[Source: ITU-T P.1100-2019, 3.2.23]
3.6
hands-free terminal
communication terminal which is hand free during user talking
Note: Refer to on-board speaker hands-free communication terminal, including on-board speaker hands-free communication terminal and emergency communication terminal.
3.7
short range wireless transmission; SRWT
wireless transmission connection between on-board hands-free terminal and mobile phone inside the vehicle
[Source: ITU-T P.1100-2019, 3.2.21, modified]
3.8
composite source signal; CSS
signal composed of a variety of time domain signals
[Source: ITU-T P.1100-2019, 3.2.3]
3.9
head and torso simulator; HATS
human simulation apparatus, equipped with simulation ears and simulation mouth, covering from the top of the head down to the waist
Note: It is designed to simulate the sound pickup characteristics of ordinary human ears and the sound diffraction produced by medium-sized adults, and to reproduce the sound field of human mouth pronunciation for electro-acoustic measurement.
[Source: ITU-T P.58-2023, 3.1.6]
3.10
simulation ear
apparatus for measuring sound pressure, consisting of an acoustic coupling cavity and a calibrated microphone
Note: The acoustic coupling cavity shall be in the frequency range of 20Hz~20,000Hz, which is close to the acoustic impedance of ordinary adult ears. The simulation ear closest to the centerline of the vehicle is the inner simulation ear.
[Source: ITU-T P.57-2021, 3.2.3]
4 Quality requirements for hands-free terminal communication
4.1 Delay
4.1.1 Delay without using short range wireless transmission (SRWT)
Test according to 7.2.1 and the delay of driving seat shall meet the following requirements:
——the loopback delay (Trtd) is less than 210ms;
——the hands-free implementation related loopback delay (Trtdimp) caused by hands-free signal processing does not exceed 110ms.
4.1.2 Delay using short range wireless transmission (SRWT)
Test according to 7.2.1 and the delay of driving seat shall meet the following requirements:
——the loopback delay (Trtd) shall be less than 210ms and 130ms when using narrowband speech and wideband speech respectively;
——the hands-free implementation related loopback delay (Trtdimp) caused by hands-free signal processing does not exceed 110ms.
4.2 Loudness rating
4.2.1 Sending loudness rating
The sending loudness rating (SLR) of the driving seat shall be tested according to 7.2.2.1, and the SLR at the point of interconnection (POI) shall be within the range of 9dB~17dB.
4.2.2 Receiving loudness rating
The receiving loudness rating (RLR) of the driving seat shall be tested according to 7.2.2.2.
If the receiving volume cannot be adjusted, the RLR at the POI shall be within the range of -2dB~6dB.
The receiving volume, if adjustable, shall meet:
——RLR at least at one volume setting meets the above requirements;
——RLR of the nominal setting of the volume is at least 15dB greater than that of the maximum setting of the volume (if the volume is adjustable);
——at least one volume setting can ensure that the signal-to-noise ratio (S/N) is at least 6dB in any possible communication and noise environment.
4.2.3 Linearity of sending loudness rating
Test according to 7.2.2.3 and the delay of driving seat shall meet the following requirements:
——when the sending signal level is 3dB less than the nominal level, the deviation between the measured SLR and that measured using the nominal setting does not exceed -0.5dB;
——when the sending signal level is 6dB more than the nominal level, the deviation between the measured SLR and that measured using the nominal setting does not exceed 0.5dB.
Contents 1 Scope 2 Normative references 3 Terms and definitions 4 Quality requirements for hands-free terminal communication 4.1 Delay 4.2 Loudness rating 4.3 Sensitivity/frequency response 4.4 Voice quality of one-way communication 4.5 Idle channel noise 4.6 Out-of-band signal processing performance 4.7 Distortion 4.8 Echo suppression performance 4.9 Switch characteristics 4.10 Dual speaker performance 4.11 Background noise transmission 5 Emergency call communication quality requirements 5.1 Delay 5.2 Loudness rating 5.3 Sensitivity/frequency response 5.4 Idle channel noise 5.5 Echo suppression performance 5.6 Sending single speaker activation characteristics 5.7 Dual speaker performance 5.8 Background noise transmission 6 Voice interaction performance and functional requirements 6.1 Speech wakeup voice trigger 6.2 Acoustic source localization accuracy 6.3 Sentence recognition rate 6.4 Interaction success rate 6.5 Wakeup response time 6.6 Interaction response time 6.7 Voice interaction terminal function 7 Test methods 7.1 Test conditions 7.2 Communication quality test 7.3 Voice interaction performance and function test Annex A (Normative) Typical noise scenario A.1 Noise scenario for hands-free terminal communication quality and voice interaction performance test A.2 Noise scenario for emergency call communication quality test Annex B (Normative) On-board voice interaction terminal functions B.1 Navigation model B.2 Air conditioning model B.3 Bluetooth telephone module B.4 Audio module B.5 Local settings module B.6 Vehicle control setting module B.7 Life service module Annex C (Normative) Performance inspection of mobile phones for tests C.1 Test system C.2 Delay C.3 Rating of response C.4 Linearity C.5 Sensitivity/frequency response C.6 Sending noise cancellation performance C.7 Voice quality of one-way communication C.8 Determination of close of acoustic control Annex D (Informative) Definition of delay D.1 Definition of hands-free terminal delay D.2 Definition of emergency call delay Bibliography
GB/T 45314-2025 Road vehicles - Performance requirements and test methods for hands free communication and voice interaction
1 Scope
This document specifies the performance requirements and test methods for hands-free communication and voice interaction of road vehicles.
This document is applicable to Categories M1 and N1 vehicles equipped with on-board speaker hands-free communication terminal, emergency communication terminal and voice interaction terminal.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions 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.
ITU-T G.122-1993 Influence of national systems on stability and talker echo in international connections
ITU-T P.51 Artificial mouth
ITU-T P.57 Artificial ears
ITU-T P.58 Head and torso simulator for telephonometry, HATS
ITU-T P.79-2007 Calculation of loudness ratings for telephone sets
ITU-T P.501-2020 Test signals for use intelephonometry
ITU-T P.502-2000 Objective test methods for speech communication systems using complex test signals
ITU-T P.863-2018 Perceptual objective listening quality assessment
ITU-T P.863.1-2019 Application guide for recommendation P.863
ETSI EG202 396-3-2018 Speech and multimedia Transmission Quality (STQ); Speech Quality performance in the presence of background noise; Part 3: Background noise transmission - Objective test methods
ETSI TS103 558-2020 Speech and multimedia Transmission Quality (STQ); Methods for objective evaluation of listening effort
ETSI TS103 802-2023 Speech and multimedia Transmission Quality (STQ); Objective test method for the evaluation of echo impairments
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
system simulator
device for simulating a mobile communication network, equipped with a radio interface on one side and receiving/sending electrical input/output interface on the other side
3.2
device under test; DUT
device to be tested
Note: Refer to Categories M1 and N1 vehicles equipped with on-board speaker hands-free communication terminal, emergency communication terminal and voice interaction terminal.
3.3
codec
device or software that has encoding and decoding functions in digital communication
[Source: ITU-T P.1100-2019, 3.2.2]
3.4
narrowband speech
transmission frequency band covering voice services of at least 300Hz~3,400Hz
3.5
wideband speech
transmission frequency band covering voice services of at least 150Hz~7,000Hz
[Source: ITU-T P.1100-2019, 3.2.23]
3.6
hands-free terminal
communication terminal which is hand free during user talking
Note: Refer to on-board speaker hands-free communication terminal, including on-board speaker hands-free communication terminal and emergency communication terminal.
3.7
short range wireless transmission; SRWT
wireless transmission connection between on-board hands-free terminal and mobile phone inside the vehicle
[Source: ITU-T P.1100-2019, 3.2.21, modified]
3.8
composite source signal; CSS
signal composed of a variety of time domain signals
[Source: ITU-T P.1100-2019, 3.2.3]
3.9
head and torso simulator; HATS
human simulation apparatus, equipped with simulation ears and simulation mouth, covering from the top of the head down to the waist
Note: It is designed to simulate the sound pickup characteristics of ordinary human ears and the sound diffraction produced by medium-sized adults, and to reproduce the sound field of human mouth pronunciation for electro-acoustic measurement.
[Source: ITU-T P.58-2023, 3.1.6]
3.10
simulation ear
apparatus for measuring sound pressure, consisting of an acoustic coupling cavity and a calibrated microphone
Note: The acoustic coupling cavity shall be in the frequency range of 20Hz~20,000Hz, which is close to the acoustic impedance of ordinary adult ears. The simulation ear closest to the centerline of the vehicle is the inner simulation ear.
[Source: ITU-T P.57-2021, 3.2.3]
4 Quality requirements for hands-free terminal communication
4.1 Delay
4.1.1 Delay without using short range wireless transmission (SRWT)
Test according to 7.2.1 and the delay of driving seat shall meet the following requirements:
——the loopback delay (Trtd) is less than 210ms;
——the hands-free implementation related loopback delay (Trtdimp) caused by hands-free signal processing does not exceed 110ms.
4.1.2 Delay using short range wireless transmission (SRWT)
Test according to 7.2.1 and the delay of driving seat shall meet the following requirements:
——the loopback delay (Trtd) shall be less than 210ms and 130ms when using narrowband speech and wideband speech respectively;
——the hands-free implementation related loopback delay (Trtdimp) caused by hands-free signal processing does not exceed 110ms.
4.2 Loudness rating
4.2.1 Sending loudness rating
The sending loudness rating (SLR) of the driving seat shall be tested according to 7.2.2.1, and the SLR at the point of interconnection (POI) shall be within the range of 9dB~17dB.
4.2.2 Receiving loudness rating
The receiving loudness rating (RLR) of the driving seat shall be tested according to 7.2.2.2.
If the receiving volume cannot be adjusted, the RLR at the POI shall be within the range of -2dB~6dB.
The receiving volume, if adjustable, shall meet:
——RLR at least at one volume setting meets the above requirements;
——RLR of the nominal setting of the volume is at least 15dB greater than that of the maximum setting of the volume (if the volume is adjustable);
——at least one volume setting can ensure that the signal-to-noise ratio (S/N) is at least 6dB in any possible communication and noise environment.
4.2.3 Linearity of sending loudness rating
Test according to 7.2.2.3 and the delay of driving seat shall meet the following requirements:
——when the sending signal level is 3dB less than the nominal level, the deviation between the measured SLR and that measured using the nominal setting does not exceed -0.5dB;
——when the sending signal level is 6dB more than the nominal level, the deviation between the measured SLR and that measured using the nominal setting does not exceed 0.5dB.
Contents of GB/T 45314-2025
Contents
1 Scope
2 Normative references
3 Terms and definitions
4 Quality requirements for hands-free terminal communication
4.1 Delay
4.2 Loudness rating
4.3 Sensitivity/frequency response
4.4 Voice quality of one-way communication
4.5 Idle channel noise
4.6 Out-of-band signal processing performance
4.7 Distortion
4.8 Echo suppression performance
4.9 Switch characteristics
4.10 Dual speaker performance
4.11 Background noise transmission
5 Emergency call communication quality requirements
5.1 Delay
5.2 Loudness rating
5.3 Sensitivity/frequency response
5.4 Idle channel noise
5.5 Echo suppression performance
5.6 Sending single speaker activation characteristics
5.7 Dual speaker performance
5.8 Background noise transmission
6 Voice interaction performance and functional requirements
6.1 Speech wakeup voice trigger
6.2 Acoustic source localization accuracy
6.3 Sentence recognition rate
6.4 Interaction success rate
6.5 Wakeup response time
6.6 Interaction response time
6.7 Voice interaction terminal function
7 Test methods
7.1 Test conditions
7.2 Communication quality test
7.3 Voice interaction performance and function test
Annex A (Normative) Typical noise scenario
A.1 Noise scenario for hands-free terminal communication quality and voice interaction performance test
A.2 Noise scenario for emergency call communication quality test
Annex B (Normative) On-board voice interaction terminal functions
B.1 Navigation model
B.2 Air conditioning model
B.3 Bluetooth telephone module
B.4 Audio module
B.5 Local settings module
B.6 Vehicle control setting module
B.7 Life service module
Annex C (Normative) Performance inspection of mobile phones for tests
C.1 Test system
C.2 Delay
C.3 Rating of response
C.4 Linearity
C.5 Sensitivity/frequency response
C.6 Sending noise cancellation performance
C.7 Voice quality of one-way communication
C.8 Determination of close of acoustic control
Annex D (Informative) Definition of delay
D.1 Definition of hands-free terminal delay
D.2 Definition of emergency call delay
Bibliography