Sound system with howling-prevention function

Details Sound system with howling-prevention function Sound system with howling-prevention function

1992-12-31

1994-04-26

Isen, Forester W.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 93, H04R 2700

Patent

active

053074173

ABSTRACT:
A sound system with a howling-prevention function comprises an all-pass filter having group delay characteristics, which vary with the elapse of time, provided on a line used for the transmission of an audio signal from a microphone. Owing to the provision of such a sound system, any deterioration in the sound quality with respect to high frequencies and a chorus phenomenon is not produced, thereby making it possible to prevent howling without causing inferior sound quality.

REFERENCES:
patent: 3681531 (1972-08-01), Burkhard et al.
patent: 4039753 (1977-08-01), Balogh et al.
patent: 4449237 (1984-05-01), Stepp et al.
Beigel, "A Digital `Phase Shifter` for Musical Applications, Using the Bell Labs (Alles-Fischer) Digital Filter Module", JAES, Sep. 1979, vol. 27, No. 9.
Chamberlin, "Musical Applications of Microprocessors", 1980, pp. 447-451.

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