US3639786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Video signalling processing apparatus
Assignee: GTE Sylvania Inc
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Filing: 1970-06-01
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Granted: 1972-02-01
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Expires: 1990-06-01
Abstract
Abstract Video signal processing apparatus which amplifies the composite video signal from the video detector of a television receiver and charges a capacitance to the peak voltage of the synchronizing pulses. The composite video signal is compared with the voltage stored in the capacitance by a comparator and an output pulse is produced when the voltage of the composite video signal is high enough to indicate the presence of a synchronizing pulse. The composite video signal is also compared with the stored voltage by a second comparator, and a noise-cancelling signal which prevents noise from affecting the voltage stored on the capacitance or the first comparator is generated when the voltage of the composite video signal is high enough to indicate the presence of noise.
Inventors
- 👤 Ralph E Lovelace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:30
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/21
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
232 words
A semiconductor integrated circuit network comprising: a wafer of semiconductor material having fabricated therein a first amplifier transistor of one conductivity type, a second amplifier transistor of the one conductivity type, a first current control transistor of the opposite conductivity type, a second current control transistor of the one conductivity type, a third current control transistor of the opposite conductivity type, and an output transistor of the opposite conductivity type; conductive means connecting the emitter of the first current control transistor to a first terminal; conductive means connecting the emitter of the second current control transistor directly to the collector of the first current control transistor; conductive means connecting the collector of the second current control transistor directly to the base of The first current control transistor; conductive means connecting the base of the third current control transistor directly to the base of the second current control transistor; resistance means connecting the emitter of the third current control transistor to the first terminal, conductive means connecting the collector of the third current control transistor directly to the bases of the first and second amplifier transistors; conductive means connecting the base of the output transistor directly to the collector of the first amplifier transistor; conductive means connecting the emitter of the output transistor directly to the first terminal; and conductive means connecting the collector of the output transistor directly to an output terminal.
Claim 2
Dependent Claim
232 words
A semiconductor integrated circuit network comprising: a wafer of semiconductor material having fabricated therein a first amplifier transistor of one conductivity type, a second amplifier transistor of the one conductivity type, a first current control transistor of the opposite conductivity type, a second current control transistor of the one conductivity type, a third current control transistor of the opposite conductivity type, and an output transistor of the opposite conductivity type; conductive means connecting the emitter of the first current control transistor to a first terminal; conductive means connecting the emitter of the second current control transistor directly to the collector of the first current control transistor; conductive means connecting the collector of the second current control transistor directly to the base of The first current control transistor; conductive means connecting the base of the third current control transistor directly to the base of the second current control transistor; resistance means connecting the emitter of the third current control transistor to the first terminal, conductive means connecting the collector of the third current control transistor directly to the bases of the first and second amplifier transistors; conductive means connecting the base of the output transistor directly to the collector of the first amplifier transistor; conductive means connecting the emitter of the output transistor directly to the first terminal; and conductive means connecting the collector of the output transistor directly to an output terminal.
Claim 3
Dependent Claim
331 words
A semiconductor integrated circuit network in accordance with claim 1 wherein: sad wafer of semiconductor material also has fabricated therein a first input transistor of the opposite conductivity type, a second input transistor of the opposite conductivity type, a current source transistor of the opposite conductivity type, a first diode having the structure of a transistor of the opposite conductivity type with the base shorted to the collector, and a second diode having the structure of a transistor of the opposite conductivity type with the base shorted to the collector; and further including: conductive means connecting the base of the first input transistor directly to a first input connection; conductive means connecting the emitter of the first input transistor directly to the emitter of the first amplifier transistor; conductive means connecting the collector of the first input transistor directly to a second terminal; conductive means connecting the base of the second input transistor directly to a second input connection; conductive means connecting the emitter of the second input transistor directly to the emitter of the second amplifier transistor; conductive means connecting the collector of the second input transistor directly to the second terminal; conducive means connecting the collector of the current source transistor directly to the collector of the first amplifier transistor; conductive means connecting the base of the current source transistor directly to the collector of the second amplifier transistor; conductive means connecting the emitter of the current source transistor directly to the first terminal; conductive means connecting the base and collector of the transistor structure of the first diode directly to the collector of the second amplifier transistor; conductive means connecting the emitter of the transistor structure of the first diode directly to the first terminal; conductive means connecting the emitter of the transistor structure of the second diode directly to the first terminal, and resistance means connecting the base and collector of the transistor structure of the second diode to the base of the second current control transistor.
References Cited (Backward Citations)
US3560770A
Cited
US3566289A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |