1.Introduction to testing services
Zhongle Certification Laboratory has meticulously designed and constructed a large number of acoustic laboratories, including a fully soundproof chamber with local noise less than 5dBA, a vehicle semi-echo chamber with a clear space exceeding 8m, an adjustable reverberation listening room, a truck-mounted audio laboratory capable of accommodating trucks, and multiple specialized acoustic laboratories such as soundproof boxes. Moreover, the laboratory is equipped with various acoustic testing systems from renowned brands like B&K, HEAD Acoustics, Audio Precision, G.R.A.S., PCB Piezotronics, and SVANTEK. These testing services, leveraging advanced equipment and a professional technical team, can provide precise, comprehensive, and reliable acoustic test results for different fields, meeting the diverse needs of customers in acoustic performance evaluation and optimization.
2.Test Specification
3.Test Item
The main components of in-car voice communication are voice communication, emergency calls and speech recognition:
1）Voice communication function: It can fully meet the daily call demand, such as Bluetooth hands-free call, CarPlay, etc., so that the driver can use the mobile phone safely in the process of focusing on driving, and effectively avoid the distraction caused by holding the mobile phone.
2）Emergency call function: mainly used for emergency rescue of vehicles, such as E-Call, B-Call, etc. When the vehicle is in an accident or facing an emergency situation, the emergency call device can be automatically or manually triggered to quickly connect to the public safety response point and timely obtain assistance.
3）Voice recognition function: it allows the driver to operate a variety of vehicle functions, such as navigation setting, music playback, window control, etc., through simple voice commands, greatly improving the convenience and safety of driving, so that the driver does not need to be distracted by manual operation, focusing on road conditions.
The in-vehicle communication system undoubtedly brings great convenience to car owners making driving more convenient and safe. However, the quality of voice communication directly affects the user experience and driving safety. For this reason, various countries and vehicle manufacturers have set strict quality requirements for in-vehicle voice communication systems. For example, Germanys voice communication testing standards adopt VDA, Russias emergency call system follows the GOST series standards, while Europe adopts the ITU-T series standards.
4.Test Scheme
The test of the in-car voice terminal usually needs to be carried out in the vehicle audio test room, which requires that the ambient noise of the environment must be low enough, and there must be no interference from reverberation.
In the test process of the in-car voice terminal, a background noise playback system will be used. The system will first collect the background noise of the vehicle under various driving conditions, and then play it back in the car to simulate the noise produced by the vehicle in real driving conditions.
The head and shoulder simulator placed in the drivers seat is equipped with an artificial ear and an artificial mouth, used to simulate the drivers "listening" and "speaking" processes. Additionally, a comprehensive tester simulates the base station signal to encode and decode the voice signals of the mobile phone, and then transmits the test results through a digital-to-analog conversion module to the system for data analysis and result output.
The whole test process aims to simulate the real driving process of the vehicle and restore the actual application status of users to the greatest extent, so as to accurately test the quality of voice calls.
If you are interested in the details of ITU-T and want to know more, please feel free to contact Zhongle Certification. We will provide you with comprehensive and detailed consulting services to help you grasp the latest developments and key information of ITU-T.
Tel：13417442373 (Skype)
E-mail:finny.zhou@zhongletest.com
