US3904967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Driving circuit for a channel selecting system
Assignee: Sony Corp
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Filing: 1974-03-21
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Granted: 1975-09-09
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Expires: 1994-03-21
Abstract
Abstract A driving circuit for a channel selecting system of a pulse driving type producing repetitive channel selecting pulses having a predetermined period in response to a duration of a control signal and further producing channel selecting pulses in response to the edge portion of the control signal thereby changing a receiving channel with desirable speed for a viewer.
Inventors
- 👤 Hisao Okada
- 👤 Shigetoshi Murakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:44
CPC Classifications
H; H03; H03J; H03J9/00; H03J9/04; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/912
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
168 words
A driving circuit for a channel selecting system of the type including channel selecting means responsive to a pulse applied thereto for changing the channel selected by said system, the driving circuit comprising: control signal generating means for selectively generating a control signal having a relatively long duration and for selectively generating intermittent control signals each being of less than a predetermined duration; pulse generating means coupled to said control signal generating means and responsive to said relatively long duration control signal for generating repetitive output pulses having a predetermined period, said output pulses generated by said pulse generating means being applied to said channel selecting means; and means for changing the operating parameters of said pulse generating means in response to said intermittent control signals of less than said predetermined duration to enable said pulse generating means to generate an output pulse in response to each control signal of less than said predetermined duration, the period of said last-mentioned output pulses being less than said predetermined period.
Claim 2
Dependent Claim
168 words
A driving circuit for a channel selecting system of the type including channel selecting means responsive to a pulse applied thereto for changing the channel selected by said system, the driving circuit comprising: control signal generating means for selectively generating a control signal having a relatively long duration and for selectively generating intermittent control signals each being of less than a predetermined duration; pulse generating means coupled to said control signal generating means and responsive to said relatively long duration control signal for generating repetitive output pulses having a predetermined period, said output pulses generated by said pulse generating means being applied to said channel selecting means; and means for changing the operating parameters of said pulse generating means in response to said intermittent control signals of less than said predetermined duration to enable said pulse generating means to generate an output pulse in response to each control signal of less than said predetermined duration, the period of said last-mentioned output pulses being less than said predetermined period.
Claim 3
Dependent Claim
76 words
A driving circuit for a channel selecting system according to claim 1 wherein said pulse generating means has a selectively variable time constant and said means for changing the operating parameters of said pulse generating means comprises time constant varying means responsive to said intermittent control signals for reducing the time constant of said pulse generating means to thereby restore said pulse generating means to a quiescent condition capable of responding to a succeeding control signal.
Claim 4
Dependent Claim
34 words
A driving circuit for a channel selecting system according to claim 1, wherein said control signal generating means generates a control signal in response to an output signal produced by a remote control circuit.
Claim 5
Dependent Claim
26 words
A driving circuit for a channel selecting system according to claim 1, including a channel selecting means comprising a tuner provided with an intermittent driving mechanism.
Claim 6
Dependent Claim
48 words
A driving circuit for a channel selecting system according to claim 1, including a channel selecting means comprising a pulse counting means, a bias voltage generating means connected to said pulse counting means and an electronic tuner controlled by a bias voltage from said bias voltage generating means.
Claim 7
Dependent Claim
41 words
A driving circuit for a channel selecting system according to claim 2, wherein said pulse generating means comprises an astable multivibrator and a first and a second time constant circuit selectively connected thereto in response to said time constant varying means.
Claim 8
Dependent Claim
69 words
A driving circuit for a channel selecting system according to claim 6, wherein said first Time constant circuit comprises a first resistor connected in said astable multivibrator and said second time constant circuit comprises a second resistor, and said time constant varying means comprises a transistor connected in series with said second resistor to form a series circuit, said series circuit being connected to said first resistor in parallel.
Claim 9
Dependent Claim
43 words
A driving circuit for a channel selecting system according to claim 7, wherein each said control signal is supplied to said astable multivibrator and to the base of said transistor, said transistor being responsive to an edge portion of each said control signal.
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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) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |