EP 0537948 A3 19930623 - METHOD AND APPARATUS FOR SMOOTHING PITCH-CYCLE WAVEFORMS
Title (en)
METHOD AND APPARATUS FOR SMOOTHING PITCH-CYCLE WAVEFORMS
Publication
Application
Priority
US 77856091 A 19911018
Abstract (en)
[origin: EP0537948A2] A method and apparatus for processing a reconstructed speech signal from an analysis-by-synthesis decoder are provided to improve the quality of reconstructed speech. By operation of the invention, one or more traces in a reconstructed speech signal are identified. Traces are sequences of like-features in the reconstructed speech signal. The like-features are identified by time-distance data received from the long term predictor of the decoder. The identified traces are smoothed by one of the known smoothing techniques. A smoothed version of the reconstructed speech signal is formed by combining one or more of the smoothed traces. The original reconstructed speech signal may be that provided by a long term predictor of the decoder. Values of the reconstructed speech signal and smoothed speech signal may be combined based on a measure of periodicity in speech. <IMAGE>
IPC 1-7
IPC 8 full level
G10L 19/08 (2013.01)
CPC (source: EP)
G10L 19/08 (2013.01)
Citation (search report)
- [A] ICASSP 91 vol. 1, 14 May 1991, TORONTO pages 233 - 236 M.COPPERI 'Efficient excitation modeling in a low bit-rate celp coder'
- [A] ICASSP 90 vol. 2, 3 April 1990, ALBUQUERQUE pages 661 - 664 P.KROON ET AL. 'Pitch predictors with high temporal resolution'
- [A] SPEECH COMMUNICATION vol. 7, 1988, pages 125 - 149 U.HEUTE 'Medium-rate speech coding - trial of a review'
Designated contracting state (EPC)
DE ES FR GB IT
DOCDB simple family (publication)
EP 0537948 A2 19930421; EP 0537948 A3 19930623; EP 0537948 B1 19970903; DE 69221985 D1 19971009; DE 69221985 T2 19980108; ES 2104842 T3 19971016; JP 3798433 B2 20060719; JP H05224698 A 19930903
DOCDB simple family (application)
EP 92309167 A 19921008; DE 69221985 T 19921008; ES 92309167 T 19921008; JP 27759292 A 19921016