Under the trend of everything, the intelligence of cars is also popularized in the mass market. Is a car smart enough or smart enough to adapt to the actual use scenario? Certification test and satisfaction with user experience become the best means of testing. At present, a hundred flowers bloom in the market. Various super enterprises, alliances and groups have released the acceptance standards for the Internet of Vehicles functions, such as,Google's Android Auto, Huawei's HiCar, etc. Xiaobian believes that whether the intelligence of a car is enough to attract people's attention and users, the quality of on-board voice calls is directly related to the user's experience satisfaction in the actual use scenarios. Because the connection time, recognition rate, echo cancellation and so on all directly affect the user's sensory experience.

So what exactly is a car voice call quality test? Today, Xiaobian will take you to have a deep understanding of the Telecom Standardization Department (ITU-T) of the International Telecommunication Union (ITU), which is in the center of the ITU, and is the merger of the original International Telegraph Advisory Committee (CCIT) and the International Radio Advisory Committee (CCIR). ITU-T has developed and published a series of standards for on-board voice call quality testing, which includes the three most widely known standards in the mainland market:

1）ITU-T P1100  On-board narrowband hands-free communication Narrowband hands-free communication in motor vehicles

2）ITU-T P1100  On-board narrowband hands-free communication  Wideband hands-free communication in motor vehicles

3）ITU-T P1120 Ultra-broadband hands-free communication Super-wideband and fullband hands-free

communication in motor vehicles

 The following below shows a demonstration of the call connection

ITU-T standard from multiple dimensions to consider, test the product meet the requirements, such as the voice distortion in two-way calls, microphone direction characteristics test, send sensitivity frequency response, receiving direction of voice quality stability, the initial convergence of no background noise, microphone distortion test, spectral echo attenuation, background noise transmission quality, frequency response of SRW sensitivity, comprehensive simulation and test the scene and effect, targeted, to ensure that the real audio quality of the product effect.

With the standard, then who can do this test and become the "referee" of the acceptance?

To be a qualified "referee", there is no doubt that you need to follow the rules and be qualified to "referee". Rules are already available (a series of international standards issued by ITU-T), so how is the "referee" qualification obtained? ITU-T stipulates: to perform the test of ITU-T, the ACQUA audio test system must be used. Only the "person" who has the test system and master the test standards and methods) can have the qualification of "referee".

Zhongle certification has been equipped with ACQUA audio test system, and multi-regional construction of vehicle audio test sites (Shenzhen, Shanghai).

Senior project personnel, professional testing personnel, imported test equipment, you are worth to contact!

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