Voiced-unvoiced discrimination for efficient compression in multichannel telephony

This paper focuses on the efficient transmission of digital telephone-quality speech in a multichannel situation. It is shown that in addition to speech interpolation, substantial savings can be achieved through the use of redundancy-reducing transcoding schemes, one for voiced and one for unvoiced sounds. Specific waveform properties and coding schemes for both types of sounds, as well as the means for the discrimination, are discussed. The performance of two experimental systems which, respectively, triple and quadruple digital carrier capacity are presented.