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US4612665A
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Graphic equalizer with spectrum analyzer and system thereof
Assignee: Victor Company of Japan Ltd
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Filing: 1981-10-23
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Granted: 1986-09-16
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Expires: 2001-10-23
Abstract
Abstract A graphic equalizer comprises an equalizer for separately level adjusting the input signal for each of a number of divided frequency bands which are different from each other, control knobs provided one for each of the divided frequency bands, which are operated for carrying out level adjusting of the equalizer, a spectrum analyzer supplied with the output signal of the equalizer and having a display for displaying the level of each of the divided frequency bands, and a casing provided with a panel face having the control knobs and the display section of the spectrum analyzer disposed in a corresponding relationship to each other and accommodating the equalizer and the spectrum analyzer therein.
Inventors
- 👤 Mamoru Inami
- 👤 Yoshiaki Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:50
CPC Classifications
G; G01; G01R; G01R23/00; G01R23/16; H; H03; H03G; H03G5/00; H03G5/02; H03G5/025
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
177 words
A graphic equalizer comprising: (a) a first equalizer for separately level adjusting a first input signal for each of a number of divided frequency bands, producing a first output signal, said divided frequency bands being different from each other; (b) control means, one for each of said divided frequency bands, for carrying out level adjusting of said first equalizer; (c) control knobs provided one for each of said divided frequency bands for manually controlling said control means; (d) a spectrum analyzer having a display section for separately displaying said first output signal for each of a number of divided frequency bands, wherein said divided frequency bands are the same frequency bands for which said first input signal is level adjusted in said first equalizer; and (e) a casing provided with a panel face having said control knobs and said display section of said spectrum analyzer and accommodating said first equalizer and said spectrum analyzer therein, said control knobs being positioned on said panel face in correspondence with said display section for each of said divided frequency bands.
Claim 2
Dependent Claim
177 words
A graphic equalizer comprising: (a) a first equalizer for separately level adjusting a first input signal for each of a number of divided frequency bands, producing a first output signal, said divided frequency bands being different from each other; (b) control means, one for each of said divided frequency bands, for carrying out level adjusting of said first equalizer; (c) control knobs provided one for each of said divided frequency bands for manually controlling said control means; (d) a spectrum analyzer having a display section for separately displaying said first output signal for each of a number of divided frequency bands, wherein said divided frequency bands are the same frequency bands for which said first input signal is level adjusted in said first equalizer; and (e) a casing provided with a panel face having said control knobs and said display section of said spectrum analyzer and accommodating said first equalizer and said spectrum analyzer therein, said control knobs being positioned on said panel face in correspondence with said display section for each of said divided frequency bands.
Claim 3
Dependent Claim
116 words
A graphic equalizer according to claim 1, wherein said equalizer comprises a buffer amplifier, a first resistor, a dc amplifier, and a capacitor connected in series between the input and output terminals, said dc amplifier having a first and a second input terminal and an output terminal; a second resistor coupled to said second input terminal and said output terminal; a plurality of variable resistors coupled in parallel to said first and second input terminal of said dc amplifier, each of said variable resistors being coupled to a common reference potential; and a plurality of tuned circuits, each of which is coupled to the slider of one of said variable resistors and to a reference potential.
Claim 4
Dependent Claim
119 words
A graphic equalizer according to claim 1, wherein: (a) a second equalizer is provided for separately level adjusting a second input signal for each of a number of divided frequency bands, producing a second output signal, said divided fequency bands being the same frequency bands into which said first input signal was divided by said first equalizer; (b) level adjustment of said second equalizer is carried out by said control means; (c) first signal processing means is provided for selectively outputting to said spectrum analyzer at any given point in time either said first output signal, said second output signal, or a sum of said first and second output signals in response to a mode selection switch operated manually.
Claim 5
Dependent Claim
57 words
A graphic equalizer as in claim 3 wherein said first signal processing means comprises an adding circuit for obtaining the sum of said first and second output signals, and switching means for selectively outputting to said spectrum analyzer either said first output signal, said second output signal, or said sum of said first and second output signals.
Claim 6
Dependent Claim
41 words
A graphic equalizer as in claim 3 wherein the center frequencies of the respective divided frequency bands in said first and second equalizers are respectively substantially equal to the center frequencies of the respective divided frequency bands in said spectrum analyzer.
Claim 7
Dependent Claim
85 words
A graphic equalizer as in claim 3 wherein: (a) a first speaker is supplied with said first output signal and emits said first output signal as sound; (b) a second speaker is supplied with said second output signal and emits said second output signal as sound; (c) a microphone picks up the sound emitted by said first and second speakers and propagated through a sound field; and (d) second signal processing means is provided for inputting the signal from said microphone to said spectrum analyzer.
Claim 8
Dependent Claim
56 words
A graphic equalizer as in claim 6 wherein said second signal processing means comprises an amplifier, an attenuator, and switching means means for supplying the input terminal of said spectrum analyzer with either the output signal of said first signal processing means or the output signal of said amplifier or the output signal of said attenuator.
Claim 9
Dependent Claim
21 words
A graphic equalizer as in claim 3 wherein said first and second input signals are generated by a pink noise generator.
Claim 10
Dependent Claim
38 words
A graphic equalizer according to claim 3, wherein said control means comprises first and second control means, one for each of said first and second equalizers, respectively, for carrying out level adjusting of said first and second equalizers.
Claim 11
Dependent Claim
38 words
A graphic equalizer according to claim 1, wherein switching means is provided for switching and supplying said first input signal to said spectrum analyzer when carrying out said level adjusting of said first equalizer by said control means.
Claim 12
Dependent Claim
116 words
A graphic equalizer according to claim 1, wherein: (a) a second equalizer is provided for separately level adjusting a second input signal for each of a number of divided frequency bands, producing a second output signal, said divided frequency bands being the same frequency bands into which said first input signal was divided by said first equalizer; (b) level adjustment of said second equalizer is carried out by said control means; (c) first signal processing means is provided for selectively outputting to said spectrum analyzer at any given point in time either said first input signal, said second input signal, or sum of said first and second input signals in response to a mode selection switch.
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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) | 1989-09-15 | 1990-03-17 | 1990-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-15 | 1994-03-17 | 1994-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-15 | 1998-03-17 | 1998-09-16 | $7700.00 | Window Closed / Lapsed |