US4903334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for preventing crosstalk in a multi-input electronic device
Assignee: RCA Licensing Corp
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Filing: 1988-05-05
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Granted: 1990-02-20
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Expires: 2008-05-05
Abstract
Abstract A system for preventing crosstalk in a stereo television receiver includes a signal selection switch for selecting between signals produced by a demodulator and signals received at an auxiliary input, a controller for generating a switching control signal and circuitry for muting the audio demodulator during channel change and when said auxiliary input is selected in response to said switching control signal.
Inventors
- 👤 Mark R. Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:20
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/44; H04N5/60; H04B; H04B1/00; H04B1/06; H04B1/10; H04B1/16; H04B1/20; H04N5/607
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
148 words
A system for preventing crosstalk between inputs of a device having a plurality of inputs, said system comprising: a source of a first signal; means for receiving a second signal; control means for generating a selection control signal; signal selection means coupled to said control means and having a first input coupled to said source of said first signal and a second input coupled to said means for receiving said second signal respectively, and being responsive to said selection control signal for selectively producing one of said first and second signals at an output; and muting means coupled to said control means and to said source of said first signal and responsive to said selection control signal for generating a muting signal and applying said muting signal to said source of said first signal for muting said source of said first signal when said second signal is selected.
Claim 2
Independent Claim
148 words
A system for preventing crosstalk between inputs of a device having a plurality of inputs, said system comprising: a source of a first signal; means for receiving a second signal; control means for generating a selection control signal; signal selection means coupled to said control means and having a first input coupled to said source of said first signal and a second input coupled to said means for receiving said second signal respectively, and being responsive to said selection control signal for selectively producing one of said first and second signals at an output; and muting means coupled to said control means and to said source of said first signal and responsive to said selection control signal for generating a muting signal and applying said muting signal to said source of said first signal for muting said source of said first signal when said second signal is selected.
Claim 3
Dependent Claim
30 words
The system of claim 1 wherein said muting means includes a plurality of voltage responsive electron control means and said source of said first signal includes a muting input terminal.
Claim 4
Dependent Claim
14 words
The system of claim 2 wherein said voltage responsive electron control means are diodes.
Claim 5
Dependent Claim
13 words
The system of claim 1 wherein said muting means is an OR gate.
Claim 6
Dependent Claim
109 words
A television audio selection system comprising: a demodulator having a mute input terminal; a signal selection switch having an audio input terminal for receiving an audio input signal from said demodulator, said signal source selection switch having an auxiliary input terminal for receiving an input signal from an auxiliary source, said source selection switch also having a terminal for receiving a selection signal; control means having an output terminal for providing said selection signal to said selection terminal; and logic means arranged between said output terminal and said mute input terminal of demodulator for muting said demodulator in response to said selection signal when said auxiliary source is selected.
Claim 7
Dependent Claim
109 words
A television audio selection system comprising: a demodulator having a mute input terminal; a signal selection switch having an audio input terminal for receiving an audio input signal from said demodulator, said signal source selection switch having an auxiliary input terminal for receiving an input signal from an auxiliary source, said source selection switch also having a terminal for receiving a selection signal; control means having an output terminal for providing said selection signal to said selection terminal; and logic means arranged between said output terminal and said mute input terminal of demodulator for muting said demodulator in response to said selection signal when said auxiliary source is selected.
Claim 8
Dependent Claim
13 words
The system of claim 5 wherein said logic means is an OR gate.
Claim 9
Dependent Claim
14 words
The system of claim 5 wherein said logic means is a plurality of diodes.
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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) | 1993-02-19 | 1993-08-21 | 1994-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-19 | 1997-08-21 | 1998-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-19 | 2001-08-21 | 2002-02-20 | $7700.00 | Window Closed / Lapsed |