Singing suppressor device

Details Singing suppressor device Singing suppressor device

1975-05-02

1977-08-02

Claffy, Kathleen H.

H04R 304

Patent

active

040397530

ABSTRACT:
Singing suppressor device for preventing singing or self-oscillation caused by acoustic feedback arising in an audio-frequency signal transmitting electroacoustic chain comprising a sound sensing device (microphone), an amplifier and a sound generator. The invention relies on the variation in the temporal order of the delay time of an electrical delay unit, on an analog and/or digital principle, inserted into the electroacoustic chain. The variation of the delay time is performed by a control generator which, with the aid of an appropriate circuit (e.g. a modulator or an auxiliary generator) continuously changes the delay time as a function of time. This ensures that singing arises only at a considerably higher sound pressure level, because owing to the varying delay time appropriate amplitude, frequency and phase conditions to induce feedback are met for a short time or moment only.

REFERENCES:
patent: 3154644 (1964-10-01), Tak
patent: 3257510 (1966-06-01), Burkhard
patent: 3429999 (1969-02-01), Stover
patent: 3749837 (1973-07-01), Doughty
patent: 3842204 (1974-10-01), Leslie

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