High-Quality Speech Compression - Expansion Method
Oliver Johnson · The Journal of the Acoustical Society of America · 1962
A new and more sophisticated method of speech compression and its evaluation are presented in this paper. Original waveforms are segmented according to the developed criteria. The resulting segments are used to construct new waveforms which are continuous and which retain the original speech qualities. Under this new method, exact control is achieved in the generation of fixed-length speech passages from variable-length passages. The quality of machine-constructed speech from prerecorded words is appreciably improved through the control described. Also, the method potentially provides a means for increasing the speech throughput over communication channels. Listening tests were conducted to evaluate the intelligibility of the new compression method and to compare it with two existing methods of compression. Curves of intelligibility as a function of compression ratio are included for each method.