Transceiver for selecting a source coder based on signal distortion estimate

摘要

A radio signal transceiver receiving at its input a speech signal and producing an output signal at a given output rate, the speech signal having undergone a source coding intended to sufficiently compress the input signal to obtain the desired output rate while an acceptable distortion ratio is maintained. In order to improve the compromise of transmission quality of the speech signal and transmission rate by selecting the optimum coder from the available coders, the transceiver comprises a measuring device for measuring the distortion of the output signal of a coder and a check circuit for comparing the estimated distortion with set values and deriving therefrom the optimum coder for the measured distortion.