Method and apparatus for eliminating feedback in stage monitors

Details Method and apparatus for eliminating feedback in stage monitors Method and apparatus for eliminating feedback in stage monitors

1981-05-29

1983-05-10

Truhe, J. V.

Music

Instruments

84DIG9, 84DIG10, 84DIG12, 179 1FS, 179 1D, G10H 102

Patent

active

043823980

ABSTRACT:
Apparatus for eliminating feedback in stage monitors for selected musical instruments includes filter networks for attenuation of a broad frequency range including the entire range of frequencies contributing to the feedback. A combination of high order low-pass and high-pass filters is used to pass fundamental and second order components of a selected instrument, while attenuating the undesired feedback frequencies as well as extremely low range frequencies capable of damaging a speaker. A pair of passbands is provided, and a pair of frequency bands is suppressed, the two pairs providing alternate attenuation and pass-bands. Active filters having operational amplifiers and frequency selective circuits are used, along with buffering and summing circuits, to attain the desired frequency characteristic.

REFERENCES:
patent: 3755749 (1973-08-01), Van Ryswyk et al.
patent: 3974461 (1976-08-01), Luce
patent: 4088834 (1978-05-01), Thurmond
patent: 4106384 (1978-08-01), Whittington et al.
patent: 4218950 (1980-08-01), Uetrecht
patent: 4359601 (1982-12-01), England

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