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A Voice Excited Predictive Coding architecture (VEPC) has been recently proposed allowing to compress digital speech at bit rates of 9600/7200 bps with a telephone quality. In order to decrease the bit rate down to 4800 bps, while preserving a same level of quality, several improvements of the processing blocks have been considered: · an adaptive pre-emphasis of the predictor coefficients, · a five to one decimation of the residual signal to reduce the residual baseband to 800 Hz, · a parallel implementation of the sub-bands splitting-reconstruction. This paper deals with the improvements as well as the implementation aspects. Taped results will be played at the conference.
Acoustics, Speech, and Signal Processing, IEEE International Conference on ICASSP '79. (Volume:4 )
Date of Conference: Apr 1979