Methods for the digital processing and transmission of speech signals

Methods for increasing the efficiency of digital speech transmission systems are examined. In particular, attention is given to probabilistic models of speech signals, digital representation of speech, and digital processing (parameter evaluations, filtering, prediction, and detection) of speech signals in systems with pulse-code modulation (PCM), delta modulation, and differential PCM, as well as in vocoders. The dispersion of the effective estimates of the parameters and the relative noise immunity of speech signals are assessed. Results of experimental studies of various speech transmission systems are reported.