05548680 is referenced by 33 patents and cites 7 patents.

A method and a device for speech signal digital coding are provided where at each frame there is carried out a long-term analysis for estimating pitch period d and a long- term prediction coefficient b and gain G, and an a-priori classification of the signal as active/inactive and, for active signal, as voiced/unvoiced. Period estimation circuits (LT1) compute such period on the basis of a suitably weighted covariance function, and classification circuits (RV) distinguish voiced signals from unvoiced signals by comparing long-term prediction coefficient and gain with frame-by-frame variable thresholds.

Title
Method and device for speech signal pitch period estimation and classification in digital speech coders
Application Number
8/243295
Publication Number
5548680
Application Date
May 17, 1994
Publication Date
August 20, 1996
Inventor
Luca Cellario
Turin
IT
Agent
Herbert Dubno
Assignee
SIP Societa Italiana per l Esercizio Delle Telecomunicazioni P A
IT
IPC
G10L 5/00
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