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US3975764A
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Television signal recording and reproducing system
Assignee: Panasonic Holdings Corp
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Filing: 1974-10-07
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Granted: 1976-08-17
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Expires: 1994-10-07
Abstract
Abstract A television signal recording and reproducing system wherein a television signal to be recorded is sequentially sampled at a predetermined number of points during each horizontal scanning period thereby to convert the television signal occupying a wide band into substantially vertically scanned signals. The converted signals, which have also been divided into multichannel signals, are recorded on a recording medium with a multichannel magnetic head. Reproduced signals from the multichannel head are sampled and added to produce the original television signals in a similar but reverse operation to the recording operation.
Inventors
- 👤 Fukashi Kobayashi
- 👤 Hiroshi Taniguchi
- 👤 Kenji Kanai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:09
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/917; H04N5/919; H04N9/00; H04N9/79; H04N9/797; H04N9/7973
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
174 words
A television signal recording and reproducing system comprising: means for generating a clock pulse having a frequency which is an n × m multiple of a horizontal scanning frequency and is phase-locked to the horizontal scanning frequency; sampling means for sequentially sampling a television signal to be recorded at n × m points during each horizontal scanning period thereof in response to the clock pulse and for converting said sampled signals into parallel signals; means for holding said sampled signals for a period of time approximately corresponding to 1/n of said horizontal scanning period; means for recording said held signals on a recording medium on m channels of recording tracks and for reproducing said recorded signals; means for writing said reproduced signals on an m-channel memory circuit at the same time at the interval of 1/n of the horizontal scanning period; means for reading out said written signals one by one at the interval of 1/m×n of the horizontal scanning period; and means for synthesizing a continuous television signal from the read out signals.
Claim 2
Dependent Claim
174 words
A television signal recording and reproducing system comprising: means for generating a clock pulse having a frequency which is an n × m multiple of a horizontal scanning frequency and is phase-locked to the horizontal scanning frequency; sampling means for sequentially sampling a television signal to be recorded at n × m points during each horizontal scanning period thereof in response to the clock pulse and for converting said sampled signals into parallel signals; means for holding said sampled signals for a period of time approximately corresponding to 1/n of said horizontal scanning period; means for recording said held signals on a recording medium on m channels of recording tracks and for reproducing said recorded signals; means for writing said reproduced signals on an m-channel memory circuit at the same time at the interval of 1/n of the horizontal scanning period; means for reading out said written signals one by one at the interval of 1/m×n of the horizontal scanning period; and means for synthesizing a continuous television signal from the read out signals.
Claim 3
Dependent Claim
73 words
A television signal recording and reproducing system according to claim 1, wherein said sampling means comprises: an m-bit ring counter driven by said clock pulse; means for sampling the input television signal in response to each of m-bit output pulses from said ring counter; m-channel memory elements for storing sampled signals; and means for simultaneously gating said stored signals in said m-channel memory elements to apply the gated signals to said holding means.
Claim 4
Dependent Claim
15 words
A television signal recording and reproducing system according to claim 1, wherein n = 1.
Claim 5
Dependent Claim
56 words
A television signal recording and reproducing system according to claim 1, wherein said means for writing said reproduced signals on said m-channel memory circuit includes a first clock signal in synchronism with a reproduced control signal, and said means for reading out said written signals includes a second clock signal generated in a reference signal oscillator.
Claim 6
Dependent Claim
146 words
A television signal recording and reproducing system comprising: means for sequentially sampling a television signal to be recorded at n × m points during each horizontal scanning period thereof; means for shifting said n × m sampling points in the adjacent fields of said television signal from each other by the distance corresponding to 1/2 of one sampling period; m groups of holding means for holding said sampled signals for the duration of a time aproximately corresponding to 1/n of the horizontal scanning period; means for causing said m groups of holding means to sequentially hold said sampled signals; means for recording on a magnetic medium in a form of m rows of recorded patterns said sampled signals held by said m groups of holding means and for reproducing said recorded signals; and means for synthesizing a continuous television signal from said reproduced m channel signals.
Claim 7
Dependent Claim
146 words
A television signal recording and reproducing system comprising: means for sequentially sampling a television signal to be recorded at n × m points during each horizontal scanning period thereof; means for shifting said n × m sampling points in the adjacent fields of said television signal from each other by the distance corresponding to 1/2 of one sampling period; m groups of holding means for holding said sampled signals for the duration of a time aproximately corresponding to 1/n of the horizontal scanning period; means for causing said m groups of holding means to sequentially hold said sampled signals; means for recording on a magnetic medium in a form of m rows of recorded patterns said sampled signals held by said m groups of holding means and for reproducing said recorded signals; and means for synthesizing a continuous television signal from said reproduced m channel signals.
Claim 8
Dependent Claim
15 words
A television signal recording and reproducing system according to claim 5, wherein n = 1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-17 | 1980-02-16 | 1980-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-17 | 1984-02-16 | 1984-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-17 | 1988-02-16 | 1988-08-17 | $7700.00 | Window Closed / Lapsed |