Patent US4682087A successfully refreshed from Google Patents.
US4682087A
Expired / Lapsed
US
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Apparatus for controlling amplitude of vertical deflection signal
Assignee: Sony Corp
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Filing: 1985-05-29
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Granted: 1987-07-21
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Expires: 2005-05-29
Abstract
Abstract An amplitude of a sawtooth signal of a vertical period of a television signal is controlled. A level discriminating circuit 7 discriminates whether or not the amplitude of the sawtooth signal of the vertical period lies within a level of an almost proper level. There is provided a counter 9 to count a vertical sync signal when the amplitude is out of this level range. An output of the counter 9 is converted into an analog amplitude control signal by a D/A converter 12, thereby making it possible to control the amplitude at a high response speed.
Inventors
- 👤 Masafumi Kikuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:45
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/48; H03K4/60; H03K4/69; H03K4/72; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/22; H04N3/223; H04N3/27
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
112 words
An apparatus for controlling an amplitude of a vertical deflection signal comprising: a vertical oscillating circuit for generating a sawtooth signal having a vertical period; a detecting circuit for detecting whether an amplitude of said sawtooth signal is in a proper level range; a counter for counting a vertical synchronizing signal when the amplitude of said sawtooth signal is out of said range in response to an output of said detecting circuit; and a D/A converter for converting an output of said counter into an analog detection signal, characterized in that an amplitude of a vertical deflection signal formed by said sawtooth signal is controlled by an output of said D/A converter.
Claim 2
Independent Claim
112 words
An apparatus for controlling an amplitude of a vertical deflection signal comprising: a vertical oscillating circuit for generating a sawtooth signal having a vertical period; a detecting circuit for detecting whether an amplitude of said sawtooth signal is in a proper level range; a counter for counting a vertical synchronizing signal when the amplitude of said sawtooth signal is out of said range in response to an output of said detecting circuit; and a D/A converter for converting an output of said counter into an analog detection signal, characterized in that an amplitude of a vertical deflection signal formed by said sawtooth signal is controlled by an output of said D/A converter.
Claim 3
Dependent Claim
29 words
An apparatus for controlling an amplitude of a vertical deflection signal according to claim 1, wherein the output of said D/A converter is supplied to said vertical oscillating circuit.
Claim 4
Dependent Claim
102 words
An apparatus for controlling an amplitude of a vertical deflection signal according to claim 2, wherein said detecting circuit has an amplitude detecting circuit for detecting the amplitude of said sawtooth signal and a level judging circuit for judging whether the amplitude of said sawtooth signal is in a proper level range, said level detecting circuit being supplied with output of said amplitude detecting circuit, and said counter is designated to either counting-up or counting-down operations by the output signal of said amplitude detecting circuit and initiated to count said vertical synchronizing signal by an output signal of said level judging circuit.
Claim 5
Dependent Claim
42 words
An apparatus for controlling an amplitude of a vertical deflection signal according to claim 3, wherein said amplitude detecting circuit has a first amplitude detecting circuit having a first threshold level and a second amplitude detecting circuit having a second threshold level.
Claim 6
Dependent Claim
33 words
An apparatus for controlling an amplitude of a vertical deflection signal according to claim 4, wherein said level judging circuit is supplied with a vertical blanking signals and judges during vertical blanking intervals.
Claim 7
Dependent Claim
33 words
An apparatus for controlling an amplitude of a vertical deflection signal according to claim 5, wherein said vertical synchronizing signal is supplied to said counter by the output of said level judging circuit.
Claim 8
Dependent Claim
91 words
An apparatus for controlling an amplitude of a vertical deflection signal according to claim 1, further comprising: a vertical drive circuit supplied with an output of said vertical oscillating circuit; a vertical deflection coil supplied with the vertical deflection signal from said vertical drive circuit; a series circuit having a capacitor and a resistor connected to said vertical deflection coil; and a variable impedance device having a control terminal connected in parallel with said resistor, wherein said analog detection output is supplied to said control terminal of said variable impedance device.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-07-20 | 1991-01-19 | 1991-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-20 | 1995-01-19 | 1995-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-20 | 1999-01-19 | 1999-07-21 | $7700.00 | Window Closed / Lapsed |