Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1989-07-27
1991-01-08
Kemeny, Emanuel S.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
381 47, G10L 500
Patent
active
049842757
ABSTRACT:
Power information from an input signal is used to detect the presence of speech. A reference point is established as the moment of detection of the speech. During a period between the reference point and a subsequent point distant from the reference point by a predetermined range, the input signal is linearly changed to a corresponding signal having a predetermined period. Feature parameters are extracted from the signal with the predetermined period. The feature parameters are replaced by preset noise parameters in a portion having no speech component therein. Standard speech patterns of particular preset words are determined and similarities between the extracted feature parameters containing the noise parameters and the standard patterns are calculated and mutually compared. The foregoing steps are performed while the separations are varied within the predetermined range. Similar steps are performed as the reference point is shifted by a unit period, and similarities are calculated and mutually compared. Speech duration is detected by use of movement of the power information. A process end time is determined by use of the speech duration time and a time dependent variation in the similarities. The selected preset word corresponds to a maximum of the similarities obtained when the reference point reaches the process end time. The selected word is then outputted as the recognition result.
REFERENCES:
patent: 3816722 (1974-06-01), Sakoe et al.
patent: 4712242 (1987-12-01), Rajasekaran et al.
patent: 4720802 (1988-01-01), Damoulakis
patent: 4751737 (1988-06-01), Gerson
patent: 4897878 (1990-01-01), Boll
Proceedings of ICASSP: "A Telephone Speech Recognition System Using Word Spotting Technique Based on Statistical Measure", by T. Kimura et al., 27.16.1, Apr., 1987, pp. 1175-1178.
Kimura Tatsuya
Watanabe Taisuke
Kemeny Emanuel S.
Matsushita Electric - Industrial Co., Ltd.
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