US3881055A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangement for separating synchronizing signals from a video signal
Assignee: US Philips Corp
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Filing: 1973-09-28
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Granted: 1975-04-29
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Expires: 1993-09-28
Abstract
Abstract A circuit arrangement for separating synchronizing signals from a television signal in which the reference level for a required amplitude selection circuit is obtained with the aid of a matrix network between two balanced amplifier outputs. Use: in television.
Inventors
- 👤 Guy Jean Cyrille Gerot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:27
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/04; H04N5/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
51 words
A method comprising supplying out of phase signals from a composite signal including video and synchronization components, and providing the black level of said composite signal by matrixing said out of phase signals, and providing separated video and synchronization components by amplitude selecting said black level and out of phase signals.
Claim 2
Independent Claim
51 words
A method comprising supplying out of phase signals from a composite signal including video and synchronization components, and providing the black level of said composite signal by matrixing said out of phase signals, and providing separated video and synchronization components by amplitude selecting said black level and out of phase signals.
Claim 3
Dependent Claim
88 words
A circuit comprising input means for receiving a composite signal including video and synchronization components, an amplifier having an input coupled to said input and a pair of balanced output means for supplying out of phase signals, a matrix network coupled to said output means and having a tap and an amplitude selection circuit having a first input pair coupled to said output means, second input coupled to said tap, first output means for supplying said synchronization component, and a second output means for supplying said video component.
Claim 4
Dependent Claim
88 words
A circuit comprising input means for receiving a composite signal including video and synchronization components, an amplifier having an input coupled to said input and a pair of balanced output means for supplying out of phase signals, a matrix network coupled to said output means and having a tap and an amplitude selection circuit having a first input pair coupled to said output means, second input coupled to said tap, first output means for supplying said synchronization component, and a second output means for supplying said video component.
Claim 5
Dependent Claim
19 words
A circuit as claimed in claim 2, wherein the matrix network comprises two series coupled resistors having equal values.
Claim 6
Dependent Claim
32 words
A circuit as claimed in claim 2, wherein the amplifier comprises a gain controllable double difference amplifier, and further compirising a difference amplifier coupled between said input means and said amplifier input.
Claim 7
Dependent Claim
44 words
A circuit as claimed in claim 4, wherein said double difference amplifier comprises transistors having collectors, and a transistor emitter follower coupled between each of the collectors of the transistors of the double difference amplifier and the first inputs of the amplitude selection circuits.
References Cited (Backward Citations)
US3706847A
Cited
US3789141A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |