As modern automobile technology changes, the performance and stability of in-car communication and hands-free calling systems have become important factors that consumers cannot ignore when purchasing a car. With the launch of a series of standards from the International Telecommunications Union (ITU), the in-car communication experience is reaching new heights. This article will take an in-depth look at key standards such as ITU-T P.1100, P.1110, P.1120, P.1140 and P.1150, revealing how they are reshaping our in-car communications and hands-free calling experience, ensuring every call All clear and smooth.
1. Standard difference comparison
ITU-T P series standards, as the authoritative guide for communication and hands-free calling technology in the automotive industry, not only define the specific requirements for test objects, but also clarify key parameters such as bandwidth, connection method and application scope. From narrowband to broadband, to ultra-wideband and even full-band, the P.1100, P.1110, and P.1120 standards have gradually broadened the frequency range of hands-free calls in the car, making the call sound quality more natural and full. These standards realize the seamless connection between mobile phones and car hands-free systems through various connection methods such as Bluetooth, USB, and WiFi, allowing users to enjoy a high-quality call experience while driving.
The ITU-T P.1140 standard focuses on the emergency call system in the car. Whether it is calling the alarm or after-sales service center, it strives to provide stable and reliable communication guarantee in emergency situations.
In addition, the ITU-T P.1150 standard sets clear functional and quality requirements for in-car communication systems, aiming to improve the quality of communication between vehicle occupants and reduce driver distraction when talking, thereby improving driving safety. This standard not only standardizes the basic functions of the in-car communication system, but also ensures the operational quality of the ICC system by setting quality levels.
2. Equipment and environment
Before testing the in-car communication and hands-free call systems, prepare the equipment required for testing and build a suitable testing environment to ensure the accuracy and reliability of the test results.
1)Test equipment
2) testing environment
lVehicle laboratory: The test needs to be conducted in a laboratory that meets certain acoustic conditions, mainly to meet the laboratory's background noise and background noise curve.
lVehicle under test: To equip the vehicle under test, confidential vehicles can choose car covers or films, but please be sure to use pre-installed models for testing. Different vehicles have different spaces and interiors, and the sound field is different during operation. The background noise is also different.
3. Execution process
In order to ensure the accuracy and reliability of test results, the test execution process under the ITU standard is carefully designed into four key links: environment confirmation, equipment calibration, noise preparation and testing.
4. Key indicators
The ITU standard also stipulates a wealth of test items and key indicators, such as delay, receiving direction test items, echo processing capabilities, etc., to comprehensively evaluate the performance of the in-car communication system.
All in all, the ITU-T P series standards provide solid support for the development of in-car communication and hands-free calling technology. With the continuous promotion and application of these standards, we have reason to believe that future cars will have more intelligent, efficient, and secure communication systems. Whether it is daily calls or emergency calls, you can get the best experience guaranteed.
If you want to know more about ITU-T voice quality testing, please contact Zhongle Certification and we will provide you with professional services!
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