EP0024850A2
Expired / Lapsed
EP
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Video signal recording and reproducing apparatus
Assignee: Panasonic Holdings Corp
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Filing: 1980-08-13
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Granted: —
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Expires: 2000-08-13
Abstract
Abstract In a video signal recording and reproducing apparatus for PAL or SECAM system color television signal, there are provided detector (20) for detecting discontinuity points of a reproduced chrominance signal or a reproduced horizontal synchronizing signal, device (12) for retarding a reproduced brightness signal by [2(t H + aH) - m] lines and retarding the reproduced chrominance signal by [2(tH + αH)-2ℓ]lines with respect to the signal before the discontinuity point each time the discontinuity point is detected by the detector, and device (16,17,18) for advancing the reproduced brightness signal by [2(t H + aH) - m] lines and advancing the reproduced chrominance signal by [2(t H + aH) - 2ℓ] lines with respect to the signal before the discontinuity point each time the discontinuity point is detected by the detector.
Inventors
- 👤 Kunio Sekimoto
- 👤 Mitsugu Shibuya
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 21:06
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/79; H04N9/87
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
264 words
A video signal recording and reproducing apparatus wherein PAL or SECAM system color television signal is sequentially recorded and reproduced on and from oblique tracks on a recording medium having a relation of t H + α H ≠ k by two heads arranged at an azimuth angle therebetween; comprising means (20) for detecting discontinuity points of a reproduced chrominance signal or a reproduced horizontal synchronizing signal in fast forward, slow, still or reverse reproduction mode where the signals are reproduced at a travelling velocity different than a travelling velocity of said recording medium in recording operation; means (14) for retarding a reproduced brightness signal by [2(t H + α H ) - m] lines and retarding a reproduced chrominance signal by [2(t H + a H ) - 2ℓ] lines with respect to the signal before the discontinuity point each time the discontinuity point is detected by said detection means in said fast forward reproduction mode; and means (16, 17, 18) for advancing the reproduced brightness signal by [2(t H + α H ) - m] lines and advancing the reproduced chrominance signal by [2(t H + α H ) - 2ℓ] lines with respect to the signal before the discontinuity point each time the discontinuity point is detected by said detection means in said slow, still or reverse reproduction mode; where a H : time difference between horizontal synchronizing signals formed on adjacent tracks when said two heads are arranged at an angle of 180° to each other; t H : the number of lines per track; and k, ℓ, m: integers.
Claim 2
Dependent Claim
264 words
A video signal recording and reproducing apparatus wherein PAL or SECAM system color television signal is sequentially recorded and reproduced on and from oblique tracks on a recording medium having a relation of t H + α H ≠ k by two heads arranged at an azimuth angle therebetween; comprising means (20) for detecting discontinuity points of a reproduced chrominance signal or a reproduced horizontal synchronizing signal in fast forward, slow, still or reverse reproduction mode where the signals are reproduced at a travelling velocity different than a travelling velocity of said recording medium in recording operation; means (14) for retarding a reproduced brightness signal by [2(t H + α H ) - m] lines and retarding a reproduced chrominance signal by [2(t H + a H ) - 2ℓ] lines with respect to the signal before the discontinuity point each time the discontinuity point is detected by said detection means in said fast forward reproduction mode; and means (16, 17, 18) for advancing the reproduced brightness signal by [2(t H + α H ) - m] lines and advancing the reproduced chrominance signal by [2(t H + α H ) - 2ℓ] lines with respect to the signal before the discontinuity point each time the discontinuity point is detected by said detection means in said slow, still or reverse reproduction mode; where a H : time difference between horizontal synchronizing signals formed on adjacent tracks when said two heads are arranged at an angle of 180° to each other; t H : the number of lines per track; and k, ℓ, m: integers.
Claim 3
Dependent Claim
141 words
A video signal recording and reproducing apparatus according to Claim 1 wherein the PAL or SECAM system color television signal is sequentially recorded and reproduced, one field of signal per track, on and from the oblique tracks on the recording medium having the relation of α H = n (where n is an integer) by the two heads having the azimuth angle therebetween; said apparatus comprising; means (20) for detecting the discontinuity points of the reproduced carrier chrominance signal in the still, slow, fast forward or reverse reproduction mode where the signals are reproduced at a travelling velocity different than a travelling velocity of said recording medium in recording operation; and means (46) for delaying the reproduced carrier chrominance signal by 1.0 line or different than that by even lines each time the discontinuity point is detected by said detection means.
Claim 4
Dependent Claim
87 words
A video signal recording and reproducing apparatus according to Claim 1 wherein said means (20) for detecting the discontinuity points of the reproduced carrier chrominance signal or the reproduced horizontal synchronizing signal generates a signal indicating the discontinuity point by one or more of a signal produced by detecting a change in an envelope of the reproduced signal, a phase compare error signal in an APC circuit (71) and a signal produced by detecting a discontinuity point in the horizontal synchronizing signal in the reproduced brightness signal.
Claim 5
Dependent Claim
52 words
A video signal recording and reproducing apparatus according to Claim 1 wherein said means (20) for detecting the discontinuity points of the reproduced carrier chrominance signal or the horizontal synchro-, nizing signal generates a signal indicating the discontinuity point by an output signal from a loss-of- .signal detector forming a dropout compensator.
Claim 6
Dependent Claim
105 words
A video signal recording and reproducing apparatus according to Claim 1 wherein the signal to be recorded and reproduced'is the PAL system color television signal, and said means for detecting the discontinuity points of the reproduced carrier chrominance signal or the reproduced horizontal synchronizing signal produces an APC error signal in a reproduced carrier chrominance signal processing circuit and a horizontal output signal in synchronism with the horizontal synchronizing signal, said APC error signal being gated by a gate signal related to said horizontal output signal so that an APC signal is produced for each horizontal scan period, said APC signal being integrated and held.
Claim 7
Dependent Claim
124 words
A video signal recording and reproducing apparatus according to Claim 1 wherein the signal to be recorded end reproduced is the PAL system color televisior, signal, and said means for detecting the dis.contir.ity points of the reproduced carrier chrominance signal or the reproduced horizontal synchronizing signal produces an APC signal in a reproduced carrier chrominance signal processing circuit and a horizontal output signal in synchronism with the horizontal synchronizing signal, and a data signal related to said horizontal output signal is produced, said data signal being read by either positive or negative polarity of said APC error signal so that a signal corresponding to a level of the data signal read is produced, said signal being retained until the data signal is next read.
Claim 8
Dependent Claim
86 words
A video signal recording and reproducing apparatus according to Claim 1 wherein said means for retarding the reproduced carrier chrominance signal or the horizontal synchronizing signal integrates the signal produced by said means for detecting the discontinuity points of the reproduced carrier chrominance signal or the horizontal synchronizing signal, applies the integrated signal to an inhibit circuit, and applies the output signal of said inhibit circuit to a flip-flop to produce a signal a polarity of which is reversed each time said detection signal is produced.
Claim 9
Dependent Claim
80 words
A video signal recording and reproducing apparatus according to Claim 1 wherein said means for retarding the reproduced brightness signal or the reproduced chrominance signal applies said reproduced signal to a plurality of delay means having a predetermined delay time difference from each other, applies the outputs from said delay means to a switching circuit, said switching circuit being controlled by a signal generated by the discontinuity point detection signal, and sequentially selects the signals applied to said switching circuit.
Claim 10
Dependent Claim
54 words
A video signal recording and reproducing circuit according to Claim 1 wherein said means for retarding the reproduced brightness signal or the reproduced chrominance signal applies said reproduced signal to a variable delay means, the delay time of said variable delay means being controlled by a signal generated by the discontinuity point detection signal.
References Cited (Backward Citations)
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