Method and device for eradicating instability due to periodic si

Details Method and device for eradicating instability due to periodic si Method and device for eradicating instability due to periodic si

1997-04-07

1999-04-06

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

Synthesis

704264, G10L 702

Patent

active

058930604

ABSTRACT:
A method and device eradicate the occasional instability inherent in analysis-by-synthesis speech/audio codecs and caused in particular by channel errors during transmission of highly periodic signals such as high-frequency sine waves. Analysis-by-synthesis techniques involve production, in response to the speech/audio signal and at regular time intervals called frames, of (a) a set of spectral parameters for use in driving a synthesis filter in view of synthesizing the speech/audio signal, and (b) a pitch gain for constructing a past-excitation-signal component supplied to the synthesis filter. In accordance with the instability eradication method, the first step consists of detecting a set of conditions including (i) a resonance condition assessed from the spectral parameters, (ii) a duration condition detected when the resonance condition has prevailed for at least the M most recent frames, M being an integer greater than 1, and (iii) a gain condition which evidences consistently-high values of the pitch gain in the N most recent frames, N being an integer greater than 1. To eradicate the occasional instability, the pitch gain is reduced to a value lower than a given threshold whenever these three conditions are detected.

REFERENCES:
patent: 5687284 (1997-11-01), Serizawa et al.
patent: 5708757 (1998-01-01), Massaloux
ITU-Recommendation G.729-Annex A: Reduced Complexity 8 KBITS/CS-ACELP Speech Codec, 13 pages (Nov./96).

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