US3824620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangement for compensating drop-out in the reproduction of signals recorded on a record carrier
Assignee: US Philips Corp
•
Filing: 1972-07-13
•
Granted: 1974-07-16
•
Expires: 1992-07-13
Abstract
Abstract A playback system for a video signal recorded on a carrier signal has a drop-out compensation circuit. This circuit has two channels, one of which delays the reproduced signal. If a dropout occurs a switch selects the delayed channel. Demodulators are coupled to the switch in each channel and compensate for the switching time of the switch.
Inventors
- 👤 E Langer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:39
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/92; H04N5/93; H04N5/94
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
151 words
A circuit comprising input means for receiving a modulated signal subject to drop outs, delay Means having an input coupled to said input means to an output, a means for detecting drop outs having an input coupled to said input means and an output, a first switch having an output, first and second signal inputs, and a control input means coupled to said detector output for coupling said second input to said output upon the occurrence of a drop out, said first input normally being coupled to said switch output, and means for demodulating said signal and for compensating for the switching time of said switch comprising a first demodulator having an input coupled to said input means and an output coupled to one of said switch signal inputs, and a second demodulator having an input coupled to said delay means output and an output coupled to the remaining switch input.
Claim 2
Dependent Claim
151 words
A circuit comprising input means for receiving a modulated signal subject to drop outs, delay Means having an input coupled to said input means to an output, a means for detecting drop outs having an input coupled to said input means and an output, a first switch having an output, first and second signal inputs, and a control input means coupled to said detector output for coupling said second input to said output upon the occurrence of a drop out, said first input normally being coupled to said switch output, and means for demodulating said signal and for compensating for the switching time of said switch comprising a first demodulator having an input coupled to said input means and an output coupled to one of said switch signal inputs, and a second demodulator having an input coupled to said delay means output and an output coupled to the remaining switch input.
Claim 3
Dependent Claim
18 words
A circuit as claimed in claim 1 further comprising a magnetic reproducing head coupled to said input means.
Claim 4
Dependent Claim
31 words
A circuit as claimed in claim 1 wherein said modulated signal comprises a video signal and said delay means has a delay equal to one line period of said video signal.
Claim 5
Dependent Claim
14 words
A circuit as claimed in claim 1 wherein said demodulators having equal delay times.
Claim 6
Dependent Claim
77 words
A circuit as claimed in claim 1 further comprising a second switch having an output coupled to said delay means input, a first input coupled to said input means and normally coupled to said output, a second input, and a control input means coupled to said detector for coupling said second input to said output upon the occurrence of drop outs; and a feedback loop coupled between said second switch second input and said delay means output.
Claim 7
Dependent Claim
14 words
A circuit as claimed in claim 5 wherein said feedback loop comprises a limiter.
Claim 8
Dependent Claim
22 words
A circuit as claimed in claim 1 wherein at least one of said demodulators comprises an integrator including a low pass filter.
Claim 9
Dependent Claim
17 words
A circuit as claimed in claim 7 wherein said demodulator comprising said integrator comprises said second demodulator.
Claim 10
Dependent Claim
14 words
A circuit as claimed in claim 7 wherein said filter comprises a variable capacitor.
Claim 11
Dependent Claim
18 words
A circuit as claimed in claim 9 wherein said variable capacitor comprises an input capacitor of said filter.
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) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |