Evaluation system for mobile radio speech codec

A multifunctional speech quality evaluation system has been developed to test the performance of mobile radio speech codecs. This system is characterized by a simple hardware configuration, a variety of software functions, and general interface specifications. Major degradation factors in mobile radio communications are taken into account, e.g., Rayleigh fading channel errors and background noise. The effects of PSTN, including transmission loss, noise, delay, and echo, are also considered. This evaluation system was used in the full-rate speech codec standardization for the Japanese digital cellular system in 1990.<
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