The quality of a mobile phone is defined above all by its acoustic characteristics. When the audio signal is tested, the radio communication tester must be fitted with a speech coder. Due to the high complexity of the mobile radio standards cdmaOne and CDMA2000, no speech coder had been provided in a test set before now; the audio section of CDMA mobile phones was usually tested
in the analog AMPS standard. Fitted with the new speech coder option, the R&S CMU200 is the first mobile radio test set capable of performing audio tests on CDMA mobile radios.
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