Patent US5002543A successfully refreshed from Google Patents.
US3914716A
Expired / Lapsed
US
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Tone control circuit
Assignee: Sansui Electric Co Ltd
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Filing: 1974-10-21
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Granted: 1975-10-21
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Expires: 1994-10-21
Abstract
Abstract A tone control circuit, wherein variable resistors for controlling low-, middle- and high-frequency tones are each connected at one end to the input terminal of said control circuit and at the other end to the output terminal of said control circuit to which the output terminal of an amplifier is connected; the sliding member of the low-frequency tonecontrolling variable resistor is connected to the input terminal of the amplifier through a resistor and also to the output terminal of said amplifier through a resistor, capacitor and resistor in turn and further to the input terminal of the control circuit through the resistor and capacitor; the sliding member of the middle-frequency tone-controlling variable resistor is connected to the input terminal of the amplifier through a capacitor and resistor; and the sliding member of the highfrequency tone-controlling variable resistor is connected to the input terminal of the amplifier through a capacitor.
Inventors
- 👤 Hirotaka Kurata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:31
CPC Classifications
H; H03; H03G; H03G5/00; H03G5/02; H03G5/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
160 words
A tone control circuit, wherein low-, middle- and highfrequency tone-controlling variable resistors are each connected at one end to the input terminal of said control circuit and at the other end to the output terminal of said control circuit; the low-frequency tone-controlling variable resistor has a sliding member which is connected through a first resistor to the input terminal of an amplifier whose output terminal is connected to the output terminal of said control circuit and which sliding member is also connected to one terminal of a second resistor, the opposite terminal of which is connected to both terminals of the middle-frequency tone-controlling variable resistor through first and second capacitors respectively; the sliding member of said middle-frequency tone-controlling variable resistor is connected to the input terminal of the amplifier through a third capacitor and a third resistor; and the sliding member of the high-frequency tone-controlling variable resistor is connected to the input terminal of the amplifier through a fourth capacitor.
Claim 2
Dependent Claim
160 words
A tone control circuit, wherein low-, middle- and highfrequency tone-controlling variable resistors are each connected at one end to the input terminal of said control circuit and at the other end to the output terminal of said control circuit; the low-frequency tone-controlling variable resistor has a sliding member which is connected through a first resistor to the input terminal of an amplifier whose output terminal is connected to the output terminal of said control circuit and which sliding member is also connected to one terminal of a second resistor, the opposite terminal of which is connected to both terminals of the middle-frequency tone-controlling variable resistor through first and second capacitors respectively; the sliding member of said middle-frequency tone-controlling variable resistor is connected to the input terminal of the amplifier through a third capacitor and a third resistor; and the sliding member of the high-frequency tone-controlling variable resistor is connected to the input terminal of the amplifier through a fourth capacitor.
Claim 3
Dependent Claim
179 words
A tone control circuit, wherein low-, middle- and high-frequency tone-controlling variable resistors are each connected at one end to the input terminal of said control circuit and at the other end to the output terminal of said control circuit; the low-frequency tone-controlling variable resistor has a sliding member which is connected through a first resistor to the input terminal of an amplifier whose output terminal is connected to the output terminal of said control circuit and which sliding member is also connected to one terminal of a second resistor, the opposite terminal of the second resistor is connected to both terminals of the low-frequency tone-controlling variable resistor through first and second capacitors respectively and also to both terminals of the middle-frequency tone-controlling variable resistor through third and fourth capacitors respectively; the sliding member of the middle-frequency tone-controlling variable resistor is connected to the input terminal of the amplifier through a fifth capacitor and a third resistor; and the sliding member of the high-frequency tone-controlling variable resistor is connected to the input terminal of the amplifier through a sixth capacitor.
Claim 4
Dependent Claim
179 words
A tone control circuit, wherein low-, middle- and high-frequency tone-controlling variable resistors are each connected at one end to the input terminal of said control circuit and at the other end to the output terminal of said control circuit; the low-frequency tone-controlling variable resistor has a sliding member which is connected through a first resistor to the input terminal of an amplifier whose output terminal is connected to the output terminal of said control circuit and which sliding member is also connected to one terminal of a second resistor, the opposite terminal of the second resistor is connected to both terminals of the low-frequency tone-controlling variable resistor through first and second capacitors respectively and also to both terminals of the middle-frequency tone-controlling variable resistor through third and fourth capacitors respectively; the sliding member of the middle-frequency tone-controlling variable resistor is connected to the input terminal of the amplifier through a fifth capacitor and a third resistor; and the sliding member of the high-frequency tone-controlling variable resistor is connected to the input terminal of the amplifier through a sixth capacitor.
Claim 5
Dependent Claim
207 words
A tone control circuit, wherein low-, middle- and high-frequency tone-controlling variable resistors are each connected at one end to the input terminal of said control circuit and at the other end to the output terminal of said control circuit; the low-frequency tone-controlling variable resistor has a sliding member which is connected through a first resistor to the input terminal of an amplifier whose output terminal is connected to the output terminal of said control circuit, and which sliding member is also connected to one terminal of a second resistor, the opposite terminal of which is connected to both terminals of the low-frequency tone-controlling variable resistor through first and second capacitors respectively; the middle-frequenCy tone-controlling variable resistor is connected at one end to the opposite terminal of the second resistor through a third capacitor and said first capacitor, and at the other end to said opposite terminal of the second resistor through a fourth capacitor and said second capacitor and is provided with a sliding member which is connected to the input terminal of the amplifier through a fifth capacitor and a third resistor; and the high-frequency tone-controlling variable resistor has a sliding member which is connected to the input terminal of the amplifier through a sixth capacitor.
Claim 6
Dependent Claim
207 words
A tone control circuit, wherein low-, middle- and high-frequency tone-controlling variable resistors are each connected at one end to the input terminal of said control circuit and at the other end to the output terminal of said control circuit; the low-frequency tone-controlling variable resistor has a sliding member which is connected through a first resistor to the input terminal of an amplifier whose output terminal is connected to the output terminal of said control circuit, and which sliding member is also connected to one terminal of a second resistor, the opposite terminal of which is connected to both terminals of the low-frequency tone-controlling variable resistor through first and second capacitors respectively; the middle-frequenCy tone-controlling variable resistor is connected at one end to the opposite terminal of the second resistor through a third capacitor and said first capacitor, and at the other end to said opposite terminal of the second resistor through a fourth capacitor and said second capacitor and is provided with a sliding member which is connected to the input terminal of the amplifier through a fifth capacitor and a third resistor; and the high-frequency tone-controlling variable resistor has a sliding member which is connected to the input terminal of the amplifier through a sixth capacitor.
References Cited (Backward Citations)
US3732373A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |