US3657577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronizing signal separating circuit
Assignee: Panasonic Holdings Corp
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Filing: 1971-04-23
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Granted: 1972-04-18
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Expires: 1991-04-23
Abstract
Abstract A synchronizing signal separating circuit provided with a noise gating circuit, the gating period of which is sufficiently long compared with the pulse width of the input signal to the input terminal and which reliably suppresses noise. The noise gating circuit does not use any capacitor but consists of a Darlington circuit, which is very convenient for manufacturing the synchronizing signal separating circuit as an integrated semiconductor circuit.
Inventors
- 👤 Shuzo Wakai
- 👤 Mitsuo Nabae
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:42
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/003; H04; H04N; H04N5/00; H04N5/14; H04N5/21; H04N5/213
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
76 words
A synchronizing signal separating circuit comprising a sync separating transistor, a self-base-biasing circuit connected between an input terminal and the base of said synch separating transistor, and a Darlington circuit, the collector-emitter circuit of one transistor of said Darlington circuit being connected between said input terminal and ground, said Darlington circuit being adapted to be triggered upon the appearance of a noise having an amplitude greater than that of the synchronizing signal at said input terminal.
Claim 2
Dependent Claim
76 words
A synchronizing signal separating circuit comprising a sync separating transistor, a self-base-biasing circuit connected between an input terminal and the base of said synch separating transistor, and a Darlington circuit, the collector-emitter circuit of one transistor of said Darlington circuit being connected between said input terminal and ground, said Darlington circuit being adapted to be triggered upon the appearance of a noise having an amplitude greater than that of the synchronizing signal at said input terminal.
Claim 3
Dependent Claim
84 words
A synchronizing signal separating circuit comprising a sync separating transistor having the base thereof connected to an input terminal, a self-emitter-biasing circuit connected between the emitter of said sync separating transistor and ground, and a Darlington circuit, the collector-emitter circuit of one transistor of said Darlington circuit being connected between said input terminal and ground, said Darlington circuit being adapted to be triggered upon the appearance of a noise signal having an amplitude greater than that of the synchronizing signal at said input terminal.
Claim 4
Dependent Claim
84 words
A synchronizing signal separating circuit comprising a sync separating transistor having the base thereof connected to an input terminal, a self-emitter-biasing circuit connected between the emitter of said sync separating transistor and ground, and a Darlington circuit, the collector-emitter circuit of one transistor of said Darlington circuit being connected between said input terminal and ground, said Darlington circuit being adapted to be triggered upon the appearance of a noise signal having an amplitude greater than that of the synchronizing signal at said input terminal.
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) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |