Elimination of feature distortions caused by analysis of wavefor

Details Elimination of feature distortions caused by analysis of wavefor Elimination of feature distortions caused by analysis of wavefor

1994-08-19

1996-01-09

Downs, Robert W.

Electrical audio signal processing systems and devices

Hearing aids, electrical

Specified casing or housing

395 215, 395 214, 395 21, 381 41, G10L 302, G10L 900

Patent

active

054836174

ABSTRACT:
A waveform to be analysed is spectrally resolved into a plurality of frequency channel outputs (1). Amplitudes of the channel outputs are then compared with threshold values (4), with the threshold values being varied in dependance on 1) previous amplitude detection in the same channel (13, 14, 15) and 2) amplitude detection in adjacent channels (16). In this way features introduced by the spectral resolution of the waveform may be filtered out along with unwanted noise. In addition, smearing due to compression of the output of the spectral resolution may be counteracted. Hence, the present invention is particularly useful in the analysis of sound waves and in speech recognition systems.

REFERENCES:
patent: 3770892 (1973-11-01), Clapper
patent: 3947636 (1976-03-01), Edgar
patent: 4250471 (1981-02-01), Duncan
patent: 4680798 (1987-07-01), Neumann
patent: 4700360 (1987-10-01), Visser
patent: 4802225 (1989-01-01), Patterson
patent: 4998280 (1991-03-01), Amano et al.
patent: 5092343 (1992-03-01), Spitzer et al.
G. L. Clapper: "Automatic word recognition"; IEEE Spectrum, vol. 8, No. 8, Aug. 1971; pp. 57-69.

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