US4807050A
Expired / Lapsed
US
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Video signal recording/reproducing apparatus
Assignee: Panasonic Holdings Corp
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Filing: 1986-12-29
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Granted: 1989-02-21
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Expires: 2006-12-29
Abstract
Abstract A video signal recording/reproducing apparatus has, in a recording signal processing section, a first switching circuit for exchanging 2-channel component signals at intervals of nH (n: any integer, H: horizontal scanning period) to obtain two combined signals each containing the 2-channel component signals which appear alternately at periods of nH, and a first delay circuit for delaying one of the two combined signals by nH so that the same kind of signals appear at same timings in the two combined signals. The two combined signals one of which is delayed by nH will not be interfered with each other by crosstalks therebetween which will occur in the subsequent circuits including recording and reproducing heads. A reproduced signal processing section has a second delay circuit for delaying by nH a reproduced combined signal which corresponds to the combined signal which has not been delayed in the recording signal processing section so as to recover the original timing relation between reproduced two combined signals, and a second switching circuit for exchanging the reproduced two combined signals one of which is delayed by nH by the second delay circuit at intervals of nH to obtain the original 2-channel component signals.
Inventors
- 👤 Akihiro Takeuchi
- 👤 Masaaki Kobayashi
- 👤 Kazuhiro Yamanishi
- 👤 Atsuo Ochi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:55
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N9/00; H04N9/79; H04N9/80; H04N9/82; H04N9/825
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
250 words
A video signal recording/reproducing apparatus for recording two-channel component signals of a video signal on a recording medium and reproducing the recorded signals, comprising: a first switching means for exchanging a first component signal of said 2-channel component signals and a second component signal of said 2-channel component signals at intervals of nH (n: any integer, H: horizontal scanning period of said video signal) to obtain first and second combined signals each containing said first and second component signals which appear alternately at periods of nH; a first delay means for delaying said first combined signal by nH to obtain a delayed first combined signal; a recording signal processing means for converting said delayed first combined signal and said second combined signal to first and second recordable signals, respectively; a recording and reproducing means for recording said first and second recordable signals on said recording medium and reproducing the recorded first and second recordable signals from said recording medium; a reproduced signal processing means for converting said first and second recordable signals reproduced from said recording medium to said delayed first combined signal and said second combined signal, respectively; a second delay means for delaying said second combined signal from said reproduced signal processing means by nH to obtain a delayed second combined signal; and a second switching means for exchanging said delayed first combined signal from said reproduced signal processing means and said delayed second combined signal at intervals of nH to obtain said first and second component signals.
Claim 2
Dependent Claim
250 words
A video signal recording/reproducing apparatus for recording two-channel component signals of a video signal on a recording medium and reproducing the recorded signals, comprising: a first switching means for exchanging a first component signal of said 2-channel component signals and a second component signal of said 2-channel component signals at intervals of nH (n: any integer, H: horizontal scanning period of said video signal) to obtain first and second combined signals each containing said first and second component signals which appear alternately at periods of nH; a first delay means for delaying said first combined signal by nH to obtain a delayed first combined signal; a recording signal processing means for converting said delayed first combined signal and said second combined signal to first and second recordable signals, respectively; a recording and reproducing means for recording said first and second recordable signals on said recording medium and reproducing the recorded first and second recordable signals from said recording medium; a reproduced signal processing means for converting said first and second recordable signals reproduced from said recording medium to said delayed first combined signal and said second combined signal, respectively; a second delay means for delaying said second combined signal from said reproduced signal processing means by nH to obtain a delayed second combined signal; and a second switching means for exchanging said delayed first combined signal from said reproduced signal processing means and said delayed second combined signal at intervals of nH to obtain said first and second component signals.
Claim 3
Dependent Claim
25 words
The apparatus according to claim 1, wherein said first and second component signals are a luminance signal and a chrominance signal of said video signal.
Claim 4
Dependent Claim
70 words
The apparatus according to claim 1, wherein said first switching means comprises a switching circuit for exchanging said first and second component signals at intervals of nH in response to a control signal which inverts its state at intervals of nH, and a switch control circuit for separating horizontal synchronizing signals from one of said first and second component signals and producing said control signal from said horizontal synchronizing signals.
Claim 5
Dependent Claim
74 words
The apparatus according to claim 1, wherein said second switching means comprises a switching circuit for exchanging said reproduced delayed first and second combined signals at intervals of nH in response to a control signal which inverts its state at intervals of nH, and a switch control circuit for separately horizontal synchronizing signals from one of said reproduced delayed first and second combined signals and producing said control signal from said horizontal synchronizing signals.
Claim 6
Dependent Claim
41 words
The apparatus according to claim 4, wherein said switch control circuit has a circuit for controlling the timing of said control signal so that said first and second component signals are respectively obtained at desired output terminals of said switching circuit.
Claim 7
Dependent Claim
44 words
The apparatus according to claim 1, wherein said recording signal processing means comprises first and second frequency modulators for respectively converting said delayed first combined signal and said second combined signal to first and second frequency-modulated signals as said first and second recordable signals.
Claim 8
Dependent Claim
43 words
The apparatus according to claim 7, wherein said reproduced signal processing means comprises first and second frequency demodulators for respectively converting said first and second frequency-modulated signals reproduced from said recording medium to said delayed first combined signal and said second combined signal.
Claim 9
Dependent Claim
275 words
A video signal recording/reproducing apparatus for recording 2-channel component signals of a video signal on a recording medium and reproducing the recorded signals, comprising: a first frequency modulator for converting a first component signal of said 2-channel component signals to a frequency-modulated first component signal; a second frequency modulator for converting a second component signal of said 2-channel component signals to a frequency-modulated second component signal; a first switching means for exchanging said frequency-modulated first and second component signals at intervals of nH (n: any integer, H: horizontal scanning period of said video signal) to obtain first and second combined signals each containing said frequency-modulated first and second component signals which appear alternately at periods of nH; a first delay means for delaying said first combined signal by nH to obtain a delayed first combined signal; a recording and reproducing means for recording said delayed first combined signal and said second combined signal on said recording medium and reproducing the recorded delayed first combined signal and second combined signal from said recording medium; a second delay means for delaying said second combined signal reproduced from said recording medium by nH to obtain a delayed second combined signal; a second switching means for exchanging said delayed first combined signal reproduced from said recording medium and said delayed second combined signal at intervals of nH to obtain said frequency-modulated first and second component signals; a first frequency demodulator for converting said frequency-modulated first component signal from said second switching means to said first component signal; and a second frequency demodulator for converting said frequency-modulated second component signal from said second switching means to said second component signal.
Claim 10
Dependent Claim
275 words
A video signal recording/reproducing apparatus for recording 2-channel component signals of a video signal on a recording medium and reproducing the recorded signals, comprising: a first frequency modulator for converting a first component signal of said 2-channel component signals to a frequency-modulated first component signal; a second frequency modulator for converting a second component signal of said 2-channel component signals to a frequency-modulated second component signal; a first switching means for exchanging said frequency-modulated first and second component signals at intervals of nH (n: any integer, H: horizontal scanning period of said video signal) to obtain first and second combined signals each containing said frequency-modulated first and second component signals which appear alternately at periods of nH; a first delay means for delaying said first combined signal by nH to obtain a delayed first combined signal; a recording and reproducing means for recording said delayed first combined signal and said second combined signal on said recording medium and reproducing the recorded delayed first combined signal and second combined signal from said recording medium; a second delay means for delaying said second combined signal reproduced from said recording medium by nH to obtain a delayed second combined signal; a second switching means for exchanging said delayed first combined signal reproduced from said recording medium and said delayed second combined signal at intervals of nH to obtain said frequency-modulated first and second component signals; a first frequency demodulator for converting said frequency-modulated first component signal from said second switching means to said first component signal; and a second frequency demodulator for converting said frequency-modulated second component signal from said second switching means to said second component signal.
Claim 11
Dependent Claim
21 words
The apparatus according to claim 8, wherein said first and second component signals are a luminance signal and a chrominance signal.
References Cited (Backward Citations)
US4117509A
Cited
US4179705A
Cited
US4283737A
Cited
US4419698A
Cited
US4476501A
Cited
US4486789A
Cited
US4533936A
Cited
US4695899A
Cited
US4661842A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-21 | 1992-08-22 | 1993-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-21 | 1996-08-22 | 1997-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-21 | 2000-08-22 | 2001-02-21 | $7700.00 | Window Closed / Lapsed |