US3819957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two channel balance control device
Assignee: Pioneer Corp
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Filing: 1972-07-27
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Granted: 1974-06-25
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Expires: 1992-07-27
Abstract
Abstract A signal level control device for varying the level of an input signal through the variation of a variable resistor. A switching circuit is turned ON for a period of time determined by the resistance of the variable resistor. The input signal is gated through the switching circuit during the ON time of the switching circuit. The output of the switching circuit is applied to a low pass filter which filters out the high frequency components due to the switching such that the output of the filter circuit is a signal having the same wave shape as the input signal and an amplitude proportional to the ON time of the switching circuit. By adjusting the variable resistor the ON time of the switching circuit is varied and thus the amplitude of the output signal is varied.
Inventors
- 👤 Y Saeki
- 👤 S Takaoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:50
CPC Classifications
H; H03; H03G; H03G1/00; H03G1/02; H03G3/00; H03G3/02; H03G3/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
290 words
A two channel balance control device for regulating the balance condition of input signals in the left and right channels in sound systems, said device comprising: a. pulse generating means for generating a series of pulses having a frequency greater than the frequency of said input signals, said pulse generating means including control means for varying the width of said pulses; b. first and second switching circuits for receiving a respective one of said input signals, one of said switching circuits being directly coupled to said pulse generating means and is turned ON by pulses therefrom such that said respective one of said input signals is gated through said one switching circuit when it is ON; c. an inverter coupled between said pulse generating means and the other of said switching circuits, said other switching circuit being turned ON by the inverted pulses from said pulse generating means such that the corresponding respective one of said input signals is gated through said other switching circuit when it is ON; and d. first and second filter circuits, coupled respectively to said first and second switching circuits, for receiving the gated input signals from said switching means and for filtering the high frequency components from said gated input signals wherein the outputs of said first and second filter circuits are signals having wave shapes which are the same as said input signals and amplitudes proportional to the pulse width of the pulses from said pulse generating means and the variation of said control means causes the amplitude of the output of one filter circuit to increase and the amplitude of the output of the other filter circuit to decrease whereby the outputs of said first and second filter circuits can be balanced.
Claim 2
Dependent Claim
290 words
A two channel balance control device for regulating the balance condition of input signals in the left and right channels in sound systems, said device comprising: a. pulse generating means for generating a series of pulses having a frequency greater than the frequency of said input signals, said pulse generating means including control means for varying the width of said pulses; b. first and second switching circuits for receiving a respective one of said input signals, one of said switching circuits being directly coupled to said pulse generating means and is turned ON by pulses therefrom such that said respective one of said input signals is gated through said one switching circuit when it is ON; c. an inverter coupled between said pulse generating means and the other of said switching circuits, said other switching circuit being turned ON by the inverted pulses from said pulse generating means such that the corresponding respective one of said input signals is gated through said other switching circuit when it is ON; and d. first and second filter circuits, coupled respectively to said first and second switching circuits, for receiving the gated input signals from said switching means and for filtering the high frequency components from said gated input signals wherein the outputs of said first and second filter circuits are signals having wave shapes which are the same as said input signals and amplitudes proportional to the pulse width of the pulses from said pulse generating means and the variation of said control means causes the amplitude of the output of one filter circuit to increase and the amplitude of the output of the other filter circuit to decrease whereby the outputs of said first and second filter circuits can be balanced.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |