Patent
1994-12-02
1997-08-12
MacDonald, Allen R.
395 231, 395 23, G10L 900
Patent
active
056574193
ABSTRACT:
A method for processing an input speech signal to be applied to a CELP vocoder has the steps of obtaining preliminary pitch search intervals by a preprocessing autocorrelation expression from a pitch lag of a synthesized speech signal which is synthesized from a residual signal of the input speech signal; computing coefficients of pitch filter with respect to the preliminary pitches; searching a high interval in the autocorrelation; and removing the remaining interval other than the high interval in the pitch lag. Since the present invention proposes a speech processing method which uses only a high interval in autocorrelation of a voice waveform in pitch-searching, and where such a speech processing method is embodied in a CELP vocoder, total computation time of the CELP vocoder can be decreased 37% or more without lowering speech quality. Therefore, a digital signal processor, which is low in price and is slow in speed, can be embodied in a CELP vocoder.
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Bae Myung-Jin
Byun Kyung-Jin
Han Ki-Chun
Kim Jong-Jae
Yoo Hah-Young
Chawan Vijay B.
Electronics and Telecommunications Research Institute
MacDonald Allen R.
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