Speech encoding method and apparatus

Details Speech encoding method and apparatus Speech encoding method and apparatus

1997-06-25

1999-12-14

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704219, 704220, G10L 302, G10L 900

Patent

active

060030011

ABSTRACT:
In encoding in which an adaptive codebook such as PSI-CELP or a fixed codebook is used on switching selection, waveform distortion caused by selection of the fixed codebook in case input speech frequency components are changed significantly is diminished. An output of an adaptive codebook 21 or an output of a fixed codebook 22 is selected by a changeover selection switch 26 and summed to an output of noise codebooks 23, 24 so as to be sent to a linear prediction synthesis filter 16. A switching control circuit 19 for controlling the switching of a changeover control switch 26 operates in response to a prediction gain which is a ratio of the linear prediction residual energy to the initial signal energy from a linear prediction analysis circuit 14 so that, if the prediction gain is smaller than a pre-set threshold value, the switching control circuit 19 judges the input signal to be voiced and controls the changeover control switch 26 for compulsorily selecting the output of the adaptive codebook 21.

REFERENCES:
patent: 5732389 (1998-03-01), Kroon

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