US3925613A
Expired / Lapsed
US
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Apparatus for extracting a vertical synchronizing pulse from a composite synchronizing signal included in a video signal
Assignee: Toshiba Corp
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Filing: 1974-06-07
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Granted: 1975-12-09
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Expires: 1994-06-07
Abstract
Abstract An apparatus for extracting a vertical synchronizing pulse from a composite synchronizing signal which comprises a device for regenerating a vertical synchronizing pulse in a continuous form by equally broadening the width of the respective input pulses to an extent at least larger than the width of the respective splits by which the vertical synchronizing pulse included in a composite synchronizing signal separated from a video signal was previously divided at a time interval equal to half the period of the horizontal synchronizing pulse, thereby obtaining a regenerated composite synchronizing signal; and a device for extracting a vertical synchronizing pulse from said regenerated vertical synchronizing pulse.
Inventors
- 👤 Naoyuki Kokado
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:43
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/04; H04N5/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
238 words
An apparatus for extracting a vertical synchronizing pulse from a composite synchronizing signal included in a video signal, comprising a synchronizing signaL-separating circuit for separating a composite synchronizing signal from a video signal; a device for providing a reproduced composite synchronizing signal which comprises a first counter circuit supplied with the composite synchronizing signal and first clock pulses, reset at the rise of the respective synchronizing pulses constituting the composite synchronizing signal and designed to commence the counting of the first clock pulses starting with the fall of the respective synchronizing pulses; a reset circuit connected to the first counter circuit so as to give forth a reset output when the first counter circuit has counted a prescribed number of the first clock pulses, and a flip-flop circuit set at the rise of the respective synchronizing pulses constituting the composite synchronizing signal, and reset by an output from the reset circuit, thereby obtaining said reproduced composite synchronizing signal containing a reproduced continuous vertical synchronizing pulse obtained by equally broadening the width of respective pulses included in the composite synchronizing signal to an extent at least larger than the width of the splits by which the vertical synchronizing pulse included in the composite synchronizing signal is previously divided at a time interval equal to half the period of a horizontal synchronizing pulse; and a device for extracting the reproduced continuous vertical synchronizing pulse from the reproduced composite synchronizing signal.
Claim 2
Independent Claim
238 words
An apparatus for extracting a vertical synchronizing pulse from a composite synchronizing signal included in a video signal, comprising a synchronizing signaL-separating circuit for separating a composite synchronizing signal from a video signal; a device for providing a reproduced composite synchronizing signal which comprises a first counter circuit supplied with the composite synchronizing signal and first clock pulses, reset at the rise of the respective synchronizing pulses constituting the composite synchronizing signal and designed to commence the counting of the first clock pulses starting with the fall of the respective synchronizing pulses; a reset circuit connected to the first counter circuit so as to give forth a reset output when the first counter circuit has counted a prescribed number of the first clock pulses, and a flip-flop circuit set at the rise of the respective synchronizing pulses constituting the composite synchronizing signal, and reset by an output from the reset circuit, thereby obtaining said reproduced composite synchronizing signal containing a reproduced continuous vertical synchronizing pulse obtained by equally broadening the width of respective pulses included in the composite synchronizing signal to an extent at least larger than the width of the splits by which the vertical synchronizing pulse included in the composite synchronizing signal is previously divided at a time interval equal to half the period of a horizontal synchronizing pulse; and a device for extracting the reproduced continuous vertical synchronizing pulse from the reproduced composite synchronizing signal.
Claim 3
Dependent Claim
55 words
A vertical synchronizing pulse-extracting apparatus according to claim 1, wherein the first counter circuit consists of first and second flip-flop circuits connected in series to each other; and the reset circuit is supplied with the first clock pulses, a set output from the first flip-flop circuit and a set output from the second flip-flop circuit.
Claim 4
Dependent Claim
159 words
A vertical synchronizing pulse-extracting apparatus according to claim 1, wherein the device for extracting the vertical synchronizing pulse from the reproduced composite synchronizing signal comprises a logical AND circuit supplied with the reproduced composite synchronizing signal and second clock pulses, thereby giving forth said second clock pulses for lengths of time corresponding to the widths of the respective pulses included in the reproduced synchronizing pulses; a second counter circuit designed to commence the counting of second clock pulses at the rise of the respective reproduced synchronizing pulses constituting the reproduced composite synchronizing signal, to be reset at the fall of said respective synchronizing pulses and to continue the counting of second clock pulses until said second counter circuit is thus reset; and a logical AND circuit connected to the second counter circuit so as to generate a pulse synchronizing with the reproduced veritical synchronizing pulse when the second counter circuit has counted a prescribed number of second clock pulses.
Claim 5
Dependent Claim
81 words
A vertical synchronizing pulse-extracting apparatus according to claim 3, wherein the second counter circuit consists of first, second and third flip-flop circuits connected in series to each other; and the logical AND circuit for producing said vertical synchronizing pulse is supplied with an output from another logical AND circuit for giving forth said second clock pulses, a set output from the first flip-flop circuit, a set output from the second flip-flop circuit and a reset output from the third flip-flop circuit.
Claim 6
Independent Claim
189 words
An apparatus for extracting a vertical synchronizing pulse from a composite synchronizing signal included in a video signal, comprising a synchronizing signal-separating circuit for separating a composite synchronizing signal from a video signal; a device for providing a reproduced composite synchronizing signal which comprises a differentiating circuit for differentiating the respective synchronizing pulse constituting the composite synchronizing signal, a monomultivibrator coupled to the differentiating circuit and generating an output pulse continuously For a prescribed length of time starting with the fall of said synchronizing pulses and a logical OR circuit supplied with an output from the monomultivibrator and the composite synchronizing signal, thereby obtaining said reproduced composite synchronizing signal containing a reproduced continuous vertical synchronizing pulse obtained by equally broadening the width of respective pulses included in the composite synchronizing signal to an extent at least larger than the width of the splits by which the vertical synchronizing pulse included in the composite synchronizing signal is previously divided at a time interval equal to half the period of a horizontal synchronizing pulse; and a device for extracting the reproduced continuous vertical synchronizing pulse from the reproduced composite synchronizing signal.
Claim 7
Independent Claim
189 words
An apparatus for extracting a vertical synchronizing pulse from a composite synchronizing signal included in a video signal, comprising a synchronizing signal-separating circuit for separating a composite synchronizing signal from a video signal; a device for providing a reproduced composite synchronizing signal which comprises a differentiating circuit for differentiating the respective synchronizing pulse constituting the composite synchronizing signal, a monomultivibrator coupled to the differentiating circuit and generating an output pulse continuously For a prescribed length of time starting with the fall of said synchronizing pulses and a logical OR circuit supplied with an output from the monomultivibrator and the composite synchronizing signal, thereby obtaining said reproduced composite synchronizing signal containing a reproduced continuous vertical synchronizing pulse obtained by equally broadening the width of respective pulses included in the composite synchronizing signal to an extent at least larger than the width of the splits by which the vertical synchronizing pulse included in the composite synchronizing signal is previously divided at a time interval equal to half the period of a horizontal synchronizing pulse; and a device for extracting the reproduced continuous vertical synchronizing pulse from the reproduced composite synchronizing signal.
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) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |