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US 4,382,398 AGranted
Method and apparatus for eliminating feedback in stage monitors
AssigneePeavey Electronics Corporation
InventorR. Michael O'Neill
Life of this patent
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AssigneePeavey Electronics Corporation
InventorR. Michael O'Neill
Estimating the term…
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.
Apparatus for modifying the output of a stage monitor comprising an electronic filter circuit electronically connected between an input of said monitor and an output speaker of said monitor, said electronic filter circuit comprising means for attenuating substantially all frequencies below about 50 Hz, substantially all frequencies between about 100 Hz and 700 Hz, and substantially all frequencies greater than about 3,500 Hz, the amount of attenuation below about 50 Hz increasing greater than about 15 db per octave to greater than minus 15 db, the amount of attenuation between about 100 Hz and 700 Hz increasing about 15 db per octave to greater than minus 15 db at a frequency between 100 Hz and 700 Hz, and the amount of attenuation greater than about 3,500 Hz increasing about 6 db per octave to greater than minus 15 db, said filter circuit passing frequencies between about 50 Hz and 100 Hz and between about 700 Hz and 3,500 Hz.
A method for modifying the frequency characteristic of the output of a stage monitor for monitoring a percussive musical instrument comprising the steps of attenuating substantially all electronic signals in said stage monitor having frequencies below about 50 Hz, passing electronic signals between about 50 Hz and 100 Hz, attenuating substantially all electronic signals between about 100 Hz and 700 Hz, and passing electronic signals from about 700 Hz to 3,500 Hz, the amount of said attenuations increasing at a rate of at least 15 db per octave to greater than minus 15 db, and attenuating electronic signals above 3,500 Hz at a rate of about 6 db per octave.
Dependencies are inferred from the claim text.