Patent US2376788A successfully refreshed from Google Patents.
Patent EP0084241A2 successfully refreshed from Google Patents.
EP0084241A2
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Signal processing device and method for video tape recording
Assignee: SHINANO KIKAKU KK
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Filing: 1982-12-16
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Granted: —
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Expires: 2002-12-16
Abstract
Abstract A non-copiable video tape recording system includes a sync separator (1) adapted to separate a horizontal and a vertical synchronizing signal from a sync signal section of a video signal, a first pulse generator (4) adapted to generate a first pulse during the back porch following the horizontal sync signal of the video signal, wherein the first pulse has a narrower width than that of the back porch, a second pulse generator (5) adapted to generate a second pulse having a lower level than that of the first pulse during the back porch, wherein the second pulse has a narrower width than that of the back porch and has a substantially equal pulse area to that of the first pulse, and means (9-15) for alternately adding the first pulse(s) and the second pulse(s) to the back porch of the video signal for predetermined time intervals.
Inventors
- 👤 Minoru Kagota
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 06:49
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/913; H04N2005/91357; H04N2005/91371
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
139 words
A video signal processing device for videotape recording, comprising a synchronizing signal separator for separating a horizontal synchronizing signal from an input video signal, a first.pulse generator for generating a first pulse at a given time during the back porch following the horizontal synchronizing signal of the said video signal, the first pulse having a narrower width than that of the back porch, a second pulse generator for generating a second pulse with a lower level than that of said first pulse at a given time during said back porch, said second pulse having a narrower width than that of the back porch and a substantially equal pulse area to that of the first pulse, and means for alternately adding the first and the second pulses to the back porch of the video signal for respective predetermined time intervals.
Claim 2
Dependent Claim
139 words
A video signal processing device for videotape recording, comprising a synchronizing signal separator for separating a horizontal synchronizing signal from an input video signal, a first.pulse generator for generating a first pulse at a given time during the back porch following the horizontal synchronizing signal of the said video signal, the first pulse having a narrower width than that of the back porch, a second pulse generator for generating a second pulse with a lower level than that of said first pulse at a given time during said back porch, said second pulse having a narrower width than that of the back porch and a substantially equal pulse area to that of the first pulse, and means for alternately adding the first and the second pulses to the back porch of the video signal for respective predetermined time intervals.
Claim 3
Dependent Claim
145 words
A video signal processing device for videotape recording, comprising a synchronizing signal separator for separating a horizontal synchronizing signal from an input colour video signal, a first pulse generator for generating a first pulse at a given time during the colour burst signal succeeding following the horizontal sync signal, the first pulse having a width unequal to the period of the frequency of the colour burst signal, a second pulse generator for generating a second pulse with a lower level than that of the first signal during said colour burst signal, the second pulse having a pulse area substantially equal to that of said first pulse and having a width not reaching the leading edge of the luminance signal section of the colour video signal, and means for alternately adding the first and second pulses to said colour burst signal for respective predetermined time intervals.
Claim 4
Dependent Claim
145 words
A video signal processing device for videotape recording, comprising a synchronizing signal separator for separating a horizontal synchronizing signal from an input colour video signal, a first pulse generator for generating a first pulse at a given time during the colour burst signal succeeding following the horizontal sync signal, the first pulse having a width unequal to the period of the frequency of the colour burst signal, a second pulse generator for generating a second pulse with a lower level than that of the first signal during said colour burst signal, the second pulse having a pulse area substantially equal to that of said first pulse and having a width not reaching the leading edge of the luminance signal section of the colour video signal, and means for alternately adding the first and second pulses to said colour burst signal for respective predetermined time intervals.
Claim 5
Dependent Claim
26 words
A signal processing device according to claim 2, characterised in that the first pulse is generated synchronously with the leading edge of the colour burst signal.
Claim 6
Dependent Claim
25 words
A signal processing device according to claim 2 or 3, characterised in that the second pulse covers the whole range of said colour burst signal.
Claim 7
Dependent Claim
33 words
A signal processing device according to one of claims 2 to 4, characterised in that the said time internals are between 1000 seconds and the period of time required for one horizontal scan.
Claim 8
Dependent Claim
16 words
A videotape recorder including a signal processing device according to any one of the preceding claims.
Claim 9
Independent Claim
75 words
A method of video tape recording including the steps of adding to the back porch following each horizontal synchronising signal at least during the display portion of the vertical scanning interval,a pulse the said pulses being either a first pulse or a second pulse having a lower amplitude than the first but substantially equal pulse area, one or more pulses of the first type and one or more of the second type being added alternately.
Claim 10
Independent Claim
75 words
A method of video tape recording including the steps of adding to the back porch following each horizontal synchronising signal at least during the display portion of the vertical scanning interval,a pulse the said pulses being either a first pulse or a second pulse having a lower amplitude than the first but substantially equal pulse area, one or more pulses of the first type and one or more of the second type being added alternately.
References Cited (Backward Citations)
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