US3686430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Muter for solid state television receivers
Assignee: LOUIS W PARKER TRUSTEE
•
Filing: 1971-03-25
•
Granted: 1972-08-22
•
Expires: 1991-03-25
Abstract
Abstract An intercarrier color television receiver using solid state components is provided with a tuned circuit sharply tuned to the intercarrier frequency for selectively producing a control signal. The control signal controls the conduction of a field effect transistor which in turn controls generation of a potential operative to selectively render the receiver''s picture producing means and sound producing means inoperative. A bias source coupled to the control electrode of the field effect transistor nullifies spurious control signals produced by the tuned circuit upon reception of noise alone.
Inventors
- 👤 Louis W Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:14
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/44; H04N5/50
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
302 words
In a television receiver, tunable signal translating means responsive to the reception of picture carrier and sound carrier signals spaced from one another by an intercarrier frequency for supplying video signals via a first controllable circuit to a picture producing means, said receiver including an intercarrier sound system for supplying frequency modulated sound signals via a second controllable circuit to a sound producing means, tuned circuit means separate from said intercarrier sound system and sharply tuned to said intercarrier frequency, said tuned circuit means being coupled to said signal translating means for selectively producing a control signal upon reception of said spaced sound and picture carrier signals; a transistor having a control electrode coupled to said tuned circuit means and an output electrode coupled to an impedance, means for so energizing said transistor that, in the absence of a control signal applied from said tuned circuit means to said control electrode, said transistor conducts to generate a potential across said impedance, and upon occurrence of said control signal said transistor is rendered non-conductive to prevent generation of said potential across said impedance, means coupling said impedance to said first controllable circuit, said first controllable circuit being responsive to the generation of said potential to render said picture producing means inoperative, and further means coupling said impedance to said second controllable circuit, said second controllable circuit being responsive to the generation of said potential to render said sound producing mEans inoperative. 2. The combination of claim 1 including bias means coupled to said control electrode, the magnitude and polarity of said bias means being selected to nullify spurious signals produced by said tuned circuit means due to reception of noise whereby said bias means maintains said transistor conductive when noise is received in the absence of said spaced sound and picture carrier signals.
Claim 2
Dependent Claim
98 words
The combination of claim 1 including bias means coupled to said control electrode, said bias means producing a bias potential having a polarity opposing the polarity of any control signal coupled from said tuned circuit means to said control electrode, the magnitude of said bias potential being sufficient to nullify spurious control signals produced by said tuned circuit means when said receiver receives only noise signals but being insufficient to nullify a control signal produced by said tuned circuit means when said receiver receives the weakest spaced sound and picture carrier signals present in the area of reception.
Claim 3
Dependent Claim
15 words
The combination of claim 3 including means for adjusting the magnitude of said bias potential.
Claim 4
Dependent Claim
36 words
The combination of claim 1 wherein at least one of said controllable circuits comprises a transistor amplifier. 6. The combination of claim 1 wherein at least one of said controllable circuits comprises a transistor emitter follower.
Claim 5
Dependent Claim
26 words
The combination of claim 1 wherein said transistor comprises a field effect transistor, said impedance comprising a resistor connected to the source electrode of said transistor.
Claim 6
Dependent Claim
20 words
The combination of claim 1 including a field effect transistor coupling said tuned circuit means to said signal translating means.
Claim 7
Dependent Claim
27 words
The combination of claim 8 including a diode limiter coupled to said field effect transistor for reducing the coupling of noise signals to said tuned circuit means.
Claim 8
Dependent Claim
225 words
A television receiver comprising signal translating means responsive to reception of picture carrier and sound carrier signals spaced from one another by an intercarrier frequency to produce video signals and frequency modulated sound signals, first transistor coupling means for coupling said video signals to a picture producing means, second transistor coupling means for coupling said sound signals to a sound producing means, tuned circuit means coupled to said signal translating means and tuned to said intercarrier frequency for producing a control signal upon reception by said receiver of said spaced picture carrier and sound carrier signals, a field effect transistor, rectifier means coupling the control electrode of said transistor to said tuned circuit means for impressing a control signal of predetermined polarity on said control electrode operative to cut off said field effect transistor upon reception by said receiver of said spaced carrier signals, impedance means coupled to another electrode of said field effect transistor and responsive to conduction of said transistor in the absence of said control signal for generating a potential, means coupling said generated potential to said first transistor coupling means for rendering said picture producing means inoperative in the absence of said control signal, and further means coupling said generated potential to said second transistor coupling means for rendering said sound producing means inoperative in the absence of said control signal.
Claim 9
Dependent Claim
225 words
A television receiver comprising signal translating means responsive to reception of picture carrier and sound carrier signals spaced from one another by an intercarrier frequency to produce video signals and frequency modulated sound signals, first transistor coupling means for coupling said video signals to a picture producing means, second transistor coupling means for coupling said sound signals to a sound producing means, tuned circuit means coupled to said signal translating means and tuned to said intercarrier frequency for producing a control signal upon reception by said receiver of said spaced picture carrier and sound carrier signals, a field effect transistor, rectifier means coupling the control electrode of said transistor to said tuned circuit means for impressing a control signal of predetermined polarity on said control electrode operative to cut off said field effect transistor upon reception by said receiver of said spaced carrier signals, impedance means coupled to another electrode of said field effect transistor and responsive to conduction of said transistor in the absence of said control signal for generating a potential, means coupling said generated potential to said first transistor coupling means for rendering said picture producing means inoperative in the absence of said control signal, and further means coupling said generated potential to said second transistor coupling means for rendering said sound producing means inoperative in the absence of said control signal.
Claim 10
Dependent Claim
92 words
The receiver of claim 10 including means for impressing a bias potential on said control electrode, said bias potential having a polarity opposite to said predetermined polarity and having a magnitude less than the magnitude of control signal impressed on said control electrode when said receiver receives said spaced carriers, whereby said bias potential is operative to maintain said transistor conductive, thereby to maintain said sound producing means and said picture producing means inoperative, when spurious control signals due to reception of noise signals alone are produced by said tuned circuit means.
Claim 11
Dependent Claim
15 words
The receiver of claim 11 including means for adjusting the magnitude of said bias potential.
Claim 12
Dependent Claim
21 words
The receiver of claim 12 including a further field effect transistor coupling said tuned circuit means to said signal translating means.
Claim 13
Dependent Claim
41 words
The receiver of claim 11 wherein said signal translating means includes an intercarrier sound system for producing said frequency modulated sound signals, said tuned circuit means being separate from said intercarrier sound system and being sharply tuned to said intercarrier frequency.
Claim 14
Dependent Claim
52 words
The receiver of claim 11 wherein said rectifier means includes a diode coupled to said tuned circuit means, and a capacitor coupled to the side of said diode remote from said tuned circuit means for accumulating a charge potential acting as the control signal of predetermined polarity impressed on said control electrode.
Claim 15
Dependent Claim
64 words
The receiver of claim 10 including means for applying a control voltage to said first transistor coupling means for controlling the brilliance of a picture produced by said picture producing means, said further means coupling said generated potential to said second transistor coupling means including a diode poled to prevent said brilliance control voltage from affecting the operation of said second transistor coupling means.
Claim 16
Dependent Claim
83 words
The receiver of claim 10 wherein the polarity of any control signal impressed on said control electrode as a result of received noise signals is the same as the polarity of any control signal impressed on said control electrode as a result of received television signals, whereby the operation of said field effect transistor is insensitive to noise when television signals are being received and said field effect transistor remains cut off upon reception of television signals notwithstanding simultaneous reception of noise signals.
References Cited (Backward Citations)
US2173173A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |