Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1981-09-14
1984-02-14
Kemeny, E. S. Matt
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
G10L 100
Patent
active
044320965
ABSTRACT:
Sounds or speech signals are converted into an electrical sound and broken down into separate spectral components in a filter bank. These components are integrated over a short period of time and produce a short-time spectrum of the signal. The spectral components are applied, via a corresponding number of parallel leads, to a number of pattern detectors which supply an output signal only if the short-time spectrum corresponds to the pattern adjusted in the relevant pattern detector. To this end, each pattern detector includes two threshold value (window) detectors which supply a signal if the applied input signal lies between two adjustable thresholds. Each threshold value detector is connected to a different output of the filter bank for another spectral range and is generally adjusted to different threshold values. The outputs of the threshold value detectors are combined via an AND-element, so that a signal is produced only if all threshold value detectors of the pattern detector are activated. For each sound or for each phoneme in the case of speech, a pattern detector is provided. When series of sounds or signals are recognized, the series of addresses of the pattern detectors which have successively generated an output signal are stored and subsequently applied to the computer for comparison.
REFERENCES:
patent: 2575909 (1951-11-01), Davis et al.
patent: 3755627 (1973-08-01), Berkowitz et al.
General Electric, "GE Transistor Manual", GE Company, U.S.A., 1964, pp. ii and 199.
D. Lancaster, "RTL Cookbook", Sams, 1971, p. 35.
Cannon, Jr. James J.
Kemeny E. S. Matt
U.S. Philips Corporation
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