Method and device for evaluating the period of the fundamental tone and the classification of the speech signal in the digital voice coders.

摘要

PRESENTED METHOD AND DEVICE FOR CODING DIGITALLY a voice signal wherein in each frame is HOLDS AN ANALYSIS LONG-TERM FOR ESTIMATING THE PERIOD OF TONE (D) AND LRF COEFFICIENT (B) AND GAIN (G), and a priori classification SIGNAL AS ACTIVE / INACTIVE AND FOR SIGNAL ACTIVE AS signal voiced / unvoiced. CIRCUITS ESTIMATE OF PERIOD (LT1) computed THAT PERIOD ON THE BASIS OF covariance function adequately compensated, and a circuit GRADING (RV) DISTINGUISHED SIGNS WITH VOICE SIGNALS WITHOUT VOICE COMPARING coefficient LRF Y EARNING WITH VARIABLE THRESHOLD frame by frame.