Frame-count-dependent smoothing filter for reducing abrupt decod

Details Frame-count-dependent smoothing filter for reducing abrupt decod Frame-count-dependent smoothing filter for reducing abrupt decod

1996-06-21

1998-07-28

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704228, 704264, H04B 1400, G10L 914

Patent

active

057873887

ABSTRACT:
In a speech decoding apparatus, a conversion unit converts a received encoded signal into a parameter in units of frames. A memory repeatedly updates and stores the parameter representing a pause state and output from the conversion unit for the pause interval of the speech signal. A synthesis filter coefficient generation unit generates a synthesis filter coefficient on the basis of the parameter read out from the memory. A smoothed filter coefficient generation unit generates a smoothed filter coefficient on the basis of the synthesis filter coefficient output from the synthesis filter coefficient generation unit. The smoothed filter coefficient generation unit generates the smoothed filter coefficient which is smoothed such that the synthesis filter coefficient changes in accordance with a count value of the frames during the predetermined period. A background noise generation unit generates background noise on the basis of the parameter read out from the memory for the pause interval of the speech signal. A smoothing filter performs filtering processing of the background noise output from the background noise generation unit by using the smoothed filter coefficient output from the smoothed filter coefficient unit and outputs smoothed background noise.

REFERENCES:
patent: 5475712 (1995-12-01), Sakari
patent: 5537509 (1996-07-01), Swaminathan et al.
patent: 5630016 (1997-05-01), Swaminathan et al.
patent: 5657421 (1997-08-01), Lorenz et al.
"GSM full-rate speech transcoding"; (ETSI/PT 12, GSM Recommendation 06.10, Jan. 1990), pp. 1-93.
"GSM full-rate speech transcoding"; (ETSI/PT 12, GSM Recommendation 06.31, Jan. 1990), pp. 1-13.
E. Masada; "Control Engineering"; Baifukan, Sep. 1985, pp. 180-182.

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