Wideband speech coding using multiple codebooks and glottal pulses
David McElroy, Brendan Murray, A.D. Fagan · 2002
We propose a coder that achieves near transparent wideband speech coding by parameterising the prediction residual through the use of multiple codebooks and synthetic glottal pulses coupled with adaptive bit allocation. The use of synthetic glottal pulses improves the performance of the coder compared to a previous coder using a single impulse without increasing the bit rate. This multiple codebook approach results in a coder operating at 16 kb/s and 24 kb/s that provides comparable speech quality to the CCITT G.722 coder operating at 64 kb/s.