Patent US4769722A successfully refreshed from Google Patents.
US4769722A
Expired / Lapsed
US
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Apparatus for recording and reproducing a video signal and for recording and reproducing a PCM audio signal on forward and reverse tape travelling directions
Assignee: Hitachi Ltd
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Filing: 1985-12-06
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Granted: 1988-09-06
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Expires: 2005-12-06
Abstract
Abstract A helical scanning type magnetic recording and reproducing apparatus records a signal representing recording conditions on a magnetic tape when a recording is effected thereon, together with a PCM audio signal. At the time of reproduction, reproducing conditions are controlled so as to be the same as the recording conditions on the basis of the signal representing recording conditions reproduced.
Inventors
- 👤 Shigeyuki Itoh
- 👤 Yoshizumi Watatani
- 👤 Akira Shibata
- 👤 Koji Kaniwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:26
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/46; G11B15/467; G11B15/4671; G11B15/4672; G11B20/00; G11B20/10; G11B20/10527; G11B27/00; G11B27/10; G11B27/19; G11B27/28; G11B27/30; G11B27/3027; G11B27/34; G11B5/00; G11B5/48; G11B5/58; G11B5/584; G11B5/588; G11B5/592; G11B5/5921; G11B5/5922; H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/92; H04N5/928; H04N9/00; H04N9/79; H04N9/7921; H04N9/7925; H04N9/80; H04N9/802; G11B2020/10537; G11B2020/10592; G11B2220/00; G11B2220/40; G11B2220/41; G11B2220/90
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
270 words
An apparatus for recording and reproducing a video signal and for recording and reproducing a PCM audio signal in forward and reverse tape traveling directions by a multichannel PCM method, wherein a recording track which is inclined at a predetermined angle with respect to the tape traveling direction is formed by a rotary magnetic head, and a video signal is recorded on a main section of said recording track during a video recording mode, and a PCM audio signal is recorded on a pluraity of tracks obtained by dividing said main section of said recording track during a multichannel PCM mode, said apparatus comprising: means for choosing the tape traveling direction to travel in a forward or reverse direction at every track of said pluraity of tracks so that the PCM audio signal is recorded on and reproduced from each of said plurality of tracks in the forward or reverse tape traveling direction; means for generating a signal representing conditions set at the time of recording including at least the traveling direction of the magnetic tape at the time of recording; means for discriminating during reproduction the recording conditions from the signal representing the recording conditions; and control means for setting conditions at the time of reproduction on the basis of the discriminated recording conditions; wherein at the time of recording, the signal representing recording conditions is recorded on the same track as the track on which said PCM audio signal is recorded, and at the time of reproduction, reproduction conditions are set to be the same as the recording conditions in accordance with the signal representing recording conditions reproduced.
Claim 2
Independent Claim
270 words
An apparatus for recording and reproducing a video signal and for recording and reproducing a PCM audio signal in forward and reverse tape traveling directions by a multichannel PCM method, wherein a recording track which is inclined at a predetermined angle with respect to the tape traveling direction is formed by a rotary magnetic head, and a video signal is recorded on a main section of said recording track during a video recording mode, and a PCM audio signal is recorded on a pluraity of tracks obtained by dividing said main section of said recording track during a multichannel PCM mode, said apparatus comprising: means for choosing the tape traveling direction to travel in a forward or reverse direction at every track of said pluraity of tracks so that the PCM audio signal is recorded on and reproduced from each of said plurality of tracks in the forward or reverse tape traveling direction; means for generating a signal representing conditions set at the time of recording including at least the traveling direction of the magnetic tape at the time of recording; means for discriminating during reproduction the recording conditions from the signal representing the recording conditions; and control means for setting conditions at the time of reproduction on the basis of the discriminated recording conditions; wherein at the time of recording, the signal representing recording conditions is recorded on the same track as the track on which said PCM audio signal is recorded, and at the time of reproduction, reproduction conditions are set to be the same as the recording conditions in accordance with the signal representing recording conditions reproduced.
Claim 3
Dependent Claim
43 words
An apparatus according to claim 1, wherein said signal representing recording conditions further represents at least one of the recording conditions including either the standard play or long play mode, either the video signal recording or multichannel PCM mode, and automatic reverse recording.
Claim 4
Dependent Claim
70 words
An apparatus according to claim 1, further comprising: means for generating pilot signals for effecting a tracking control; means for adding the pilot signals to the video signal or the PCM audio signal so as to record the pilot signals together with the video signal or the PCM audio signal; and means for effecting the tracking control at the time of reproduction on the basis of the pilot signals reproduced.
Claim 7
Dependent Claim
39 words
An apparatus according to claim 3, further comprising means for determining whether a recording on a magnetic tape has been effected by the NTSC system or the CCIR system on the basis of frequencies of the pilot signals reproduced.
References Cited (Backward Citations)
US3913135A
Cited
US4249220A
Cited
US4346397A
Cited
US4583134A
Cited
US4389681A
Cited
US4521815A
Cited
US4550345A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-06 | 1992-03-07 | 1992-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-06 | 1996-03-07 | 1996-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-06 | 2000-03-07 | 2000-09-06 | $7700.00 | Window Closed / Lapsed |