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Browse Prior Art Database

Speech Compression and Reconstruction

IP.com Disclosure Number: IPCOM000052774D
Original Publication Date: 1981-Jul-01
Included in the Prior Art Database: 2005-Feb-11

Publishing Venue

IBM

Related People

Authors:
Nassimbene, EG [+details]

Abstract

This invention relates to a method for the lossy compression recording and expansion of asymmetrical speech waves. The waves are compressed by the sampling of a leading partial cycle segment, extracting pitch and contour information, then digitizing and recording the sample. In this regard, only the first cycle of each pitch period is used for compression and reconstruction of speech. The method is premised upon the observation that within most pitch periods the first one-fourth to one-fifth of the waveform is significantly larger in amplitude than subsequent ones. Further, the first one-quarter to one-fifth of the waveform contains nearly all the frequency components that the remainder of the waveform contains.