All test cases based on ITU-T Recommendation P.1100 have been commercialized as the ACQUA standard specification P.1100.
In-vehicle hands-free calling faces numerous acoustic challenges such as low S/N ratio, echo, double talk, and RF transmission interference, making it a difficult task to achieve good call quality. The International Telecommunication Union (ITU) specifies ITU-T Recommendation P.1100, which includes tests and requirements for the voice quality of wideband in-vehicle hands-free calls. ITU-T Recommendation P.1100 outlines testing methods for essential elements of call quality, including loudness rating, transfer function, idle channel noise in both the speaking and receiving directions, out-of-band signal suppression, echo attenuation, and minimum activation levels. It includes tests for factory-installed hands-free systems, commercially available hands-free car kits, and both wired and wireless in-vehicle headsets.
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basic information
Automated ACQUA standard for narrowband voice quality evaluation of in-vehicle hands-free communication systems and devices. Supports testing of OEM-installed and aftermarket in-vehicle hands-free systems, as well as wired and wireless headsets. Cutting-edge measurement methods for voice quality analysis. Supports A²B for recording background noise and digital insertion.
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Applications/Examples of results
Automatic voice quality analysis of narrowband vehicle hands-free terminals in accordance with ITU-T Recommendation P.1100 Experimental development and optimization of vehicle hands-free terminals with objective audio quality evaluation Optimization of the mounting positions of in-vehicle hands-free microphones and speakers
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Company information
HEAD acoustics Japan Co., Ltd. has been active as a leading company in the fields of dummy head-related recording and playback systems, acoustic analysis based on human auditory characteristics, and communication measurement technology for over 25 years. HEAD acoustics has consistently been a pioneer in developing innovative technologies such as dummy head-related binaural technology, acoustic analysis related to human hearing, interactive sound simulation systems, and transmission path analysis. HEAD acoustics will continue to focus on research and development through collaboration with universities and other research institutions and participation in international research projects.