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Patent US3598889A successfully refreshed from Google Patents.
US3598889A
Expired / Lapsed
US
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Music frequency selector circuit
Assignee: Individual
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Filing: 1970-05-27
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Granted: 1971-08-10
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Expires: 1990-05-27
Abstract
Abstract A circuit for selectively energizing one of several different colored lights in accordance with the frequency of music being played, which prevents energization of all the lights by loud music passages. The circuit includes a silicon controlled rectifier (SCR) for each light, each SCR having an anode connected through the light to one terminal of a power source, a cathode connected through a common bias resistor to the other terminal of the power source, and a gate connected through a filter to the music source to allow only a certain frequency range of music to raise the gate potential high enough to turn on the SCR. The common bias resistor increases the effective selectivity of the filters, because as soon as one SCR turns on, the resulting voltage across the common bias resistor raises the potential of all of the SCR cathodes to prevent any other SCR''s from turning on.
Inventors
- 👤 Henry N Switsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:11
CPC Classifications
A; A63; A63J; A63J17/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
141 words
A music frequency selector circuit for selectively connecting loads to terminals of a power source comprising: a plurality of controlled rectifier means, each having an anode, a cathode, and a gate; means for coupling a first of said power terminals to a first terminal of each of said loads; means for coupling a second terminal of each of said loads to a respective anode of said controlled rectifier means; a plurality of filter means, each coupling primarily only a certain frequency range of signals representing said music to the gate of a respective rectifier means; and biasing means having a first terminal coupled to the cathodes of said plurality of controlled rectifier means and a second terminal coupled to a second terminal of said power source, for providing a voltage drop thereacross upon the firing of one of said rectifier means.
Claim 2
Dependent Claim
141 words
A music frequency selector circuit for selectively connecting loads to terminals of a power source comprising: a plurality of controlled rectifier means, each having an anode, a cathode, and a gate; means for coupling a first of said power terminals to a first terminal of each of said loads; means for coupling a second terminal of each of said loads to a respective anode of said controlled rectifier means; a plurality of filter means, each coupling primarily only a certain frequency range of signals representing said music to the gate of a respective rectifier means; and biasing means having a first terminal coupled to the cathodes of said plurality of controlled rectifier means and a second terminal coupled to a second terminal of said power source, for providing a voltage drop thereacross upon the firing of one of said rectifier means.
Claim 3
Dependent Claim
13 words
The circuit described in claim 1 wherein: said biasing means includes a resistor.
Claim 4
Dependent Claim
13 words
The circuit described in claim 1 wherein: said biasing means includes a diode.
Claim 5
Dependent Claim
21 words
The circuit described in claim 1 wherein: said biasing means includes a resistor and at least one diode connected in parallel.
Claim 6
Dependent Claim
85 words
The apparatus described in claim 1 wherein: each of said loads has a resistance within a predetermined limited range; said power source is approximately a 110 volt root mean square sinusoidal source; and said biasing means includes a resistor of a resistance value which provides a voltage on the order of one volt thereacross when connected to the voltage which said power source has on the order of several degrees past its zero voltage point substantially only through the resistance of one of said loads.
Claim 7
Dependent Claim
136 words
The circuit described in claim 1 including: a music input terminal for receiving signals representing said music; and wherein a first of said filter means includes a resistor coupled between said music input terminal and the gate of a first of said rectifier means, a capacitor coupled between said gate and Said second terminal of said power source, and a resistor coupled between said gate and said second terminal of said power source, for biasing said gate in accordance with low frequency components of said music signals; and a second of said filter means includes a capacitor coupled between said music input terminal and the gate of a second of said rectifier means and a resistor coupled between said gate and said second power terminal, for biasing said gate in accordance with high frequency music components.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |