The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 16, 1997
Filed:
Sep. 27, 1995
Hidetaka Takahashi, Hachioji, JP;
Olympus Optical Co. Ltd., Tokyo, JP;
Abstract
A sound recording and reproducing device codes a sound signal by a code excited linear predictive coding means including an adaptive code book created on the basis of past excitation signals, a stochastic code book having a plurality of different stochastic signals and a pulse code book having a plurality of pulse signals. When decoding the sound data coded frame by frame by code excited linear predictive coding, each frame comprising a plurality of sub-frames, by using an adaptive code book created on the basis of a past excitation signal, and a stochastic code book having a plurality of different stochastic signals, a switch controller controls switches such that the coded data in a predetermined sub-frame of each frame is skipped in accordance with the rate of change of reproduction speed to decode the coded data in the remaining sub-frame or sub-frames without decoding the coded data in the skipped sub-frame, and the contents of the adaptive code book are renewed.