US4382398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for eliminating feedback in stage monitors
Assignee: Peavey Electronics Corp
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Filing: 1981-05-29
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Granted: 1983-05-10
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Expires: 2001-05-29
Abstract
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.
Inventors
- 👤 R. Michael O'Neill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:25
CPC Classifications
H; H04; H04R; H04R3/00; H04R3/02; Y; Y10; Y10S; Y10S84/00; Y10S84/09; Y10S84/10; Y10S84/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
159 words
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.
Claim 2
Dependent Claim
159 words
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.
Claim 3
Dependent Claim
70 words
The apparatus of claim 1 wherein said electronic filter circuit comprises a plurality of filter stages including: first and second high-pass frequency filter means for passing frequencies above about 700 Hz and about 50 Hz respectively, first low-pass frequency filter means connected to said second high-pass frequency filter means for passing frequencies below about 100 Hz, and combining means for combining outputs of said high-pass and low-pass frequency filter means.
Claim 4
Dependent Claim
21 words
An apparatus as recited in claim 2 further comprising input buffer means having both high frequency and low frequency attenuation means.
Claim 5
Dependent Claim
18 words
An apparatus as recited in claim 2 wherein said combining means further includes second low-pass frequency selective means.
Claim 6
Dependent Claim
51 words
An apparatus as recited in claim 2 wherein said first high-pass frequency filter means is parallel connected with a series combination of said second high-pass frequency filter means and first low-pass frequency filter means, each of said parallel connected filter means and series combination providing an output to said combining means.
Claim 7
Dependent Claim
48 words
An apparatus as recited in claim 5 wherein said first high-pass frequency filter means comprises third order frequency selective high-pass circuitry; said second high-pass frequency filter means comprises fourth order frequency selective high-pass circuitry; and said first low-pass frequency filter means comprises third order frequency selective low-pass circuitry.
Claim 8
Dependent Claim
35 words
An apparatus as recited in claim 6 wherein said first and second high-pass frequency filter means and said first low-pass frequency filter means each comprise amplifying means connected with the respective frequency selective means thereof.
Claim 9
Independent Claim
110 words
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.
Claim 10
Independent Claim
110 words
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.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-09 | 1986-11-08 | 1987-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-09 | 1990-11-08 | 1991-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-09 | 1994-11-08 | 1995-05-10 | $7700.00 | Window Closed / Lapsed |