New distortion measure in regular pulse excitation speech coding

The authors introduce a new distortion measure for determining the amplitudes of the regular pulse sequence used in regular-pulse excitation speech coding. The method combines the adaptive predictive distortion criterion with the distortion measure used in the typical regular-pulse excitation system and reduces the degradation due to pulse amplitude quantization. Experimental results show that the proposed distortion measure provides increases of about 0.7 to 1 dB in segmental signal-to-noise ratio, a better reproduction of the original spectrogram, and perceptually good speech quality at medium bit rates (of about 16 kb/s)