US4670796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary head type PCM recorder
Assignee: Hitachi Ltd
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Filing: 1984-06-27
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Granted: 1987-06-02
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Expires: 2004-06-27
Abstract
Abstract The recording area of the magnetic tape is divided into a first area for recording a PCM converted audio signal and a second area for recording a PCM converted video information. In recording the audio signal and the video information which have been separately PCM converted, the magnetic tape is wrapped around the rotary heads so that a wrap angle of each of said first and second areas is less than 90° with respect to the rotary heads of a predetermined diameter.
Inventors
- 👤 Masaharu Kobayashi
- 👤 Takaharu Noguchi
- 👤 Takao Arai
- 👤 Michio Masuda
- 👤 Yasufumi Yumde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:35
CPC Classifications
B; B21; B21B; B21B43/00; B21B43/04; H; H04; H04N; H04N5/00; H04N5/76; H04N5/78; H04N5/782; H04N5/7824; H04N5/7826; H04N5/78263; G; G11; G11B; G11B20/00; G11B20/10; G11B20/10527; G11B20/18; G11B20/1806; G11B20/1809; G11B5/00; G11B5/008; G11B5/00813; G11B5/00847; G11B5/0086; G11B5/00865; G11B5/48; G11B5/52; G11B5/53; G11B5/531; H04N5/91; H04N5/92; H04N5/926; H04N5/9265; H04N5/9267; H04N5/9268; H04N9/00; H04N9/79; H04N9/80; H04N9/804; H04N9/806; H04N9/8063
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
160 words
A rotary head type PCM recorder comprising: rotary head means for at least one of recording and reproducing first and second PCM converted signals on a magnetic tape on which a plurality of slant parallel tracks are to be formed; and recording circuit means for sequentially recording a PCM converted audio signal and a PCM converted video signal as said first and second PCM converted signals on first and second areas of any one slant track, respectively, said first and second areas of any one slant track being separate from each other and occupying a substantial part of said one slant track without overlap, each of said first and second areas having a length corresponding to a head scan angle of less than 90° such that said first and second areas are recorded on said magnetic tape having a wrap angle sufficient to enable at least one of signal recording and reproducing on the entirety of said one slant track.
Claim 2
Dependent Claim
160 words
A rotary head type PCM recorder comprising: rotary head means for at least one of recording and reproducing first and second PCM converted signals on a magnetic tape on which a plurality of slant parallel tracks are to be formed; and recording circuit means for sequentially recording a PCM converted audio signal and a PCM converted video signal as said first and second PCM converted signals on first and second areas of any one slant track, respectively, said first and second areas of any one slant track being separate from each other and occupying a substantial part of said one slant track without overlap, each of said first and second areas having a length corresponding to a head scan angle of less than 90° such that said first and second areas are recorded on said magnetic tape having a wrap angle sufficient to enable at least one of signal recording and reproducing on the entirety of said one slant track.
Claim 3
Dependent Claim
80 words
A rotary head type PCM recorder according to claim 1, wherein each of said PCM converted audio and video signals are recorded by said recording circuit means in blocks, each block including a sync signal pattern, record data and an error detection and correction code, at least one of the length of the block, the sync pattern and the error detection and correction code of said PCM converted audio signal being identical with that of said PCM converted video signal.
Claim 4
Dependent Claim
37 words
A rotary head type PCM recorder according to claim 1, wherein said recording circuit means includes recording means for recording said video signal on said second area in a time-division fashion in the unit of a frame.
Claim 5
Dependent Claim
42 words
A rotary head type PCM recorder according to claim 1, wherein said recording circuit means includes recording means for recording said video signal on said second area in a time-division fashion in the unit of a positive integer times the scanning line.
Claim 6
Dependent Claim
25 words
A rotary head type PCM recorder according to claim 4, wherein said video signal includes digital components of a luminance signal and color difference signals.
Claim 7
Dependent Claim
50 words
A rotary head type PCM recorder according to claim 1, wherein said rotary head means has at least two magnetic heads disposed on the periphery thereof at an interval of 180°, and said first and second PCM converted signals are recorded on said magnetic tape by said two magnetic heads.
Claim 8
Dependent Claim
74 words
A rotary head type PCM recorder according to claim 1, wherein said rotary head means has four magnetic heads disposed on the periphery thereof respectively, at intervals of 90°, and one of said first and second PCM converted signals is reproduced by two magnetic heads opposed to each other at an interval of 180° and the remaining two magnetic heads are utilized to record the other of said first and second PCM converted signals.
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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) | 1990-06-01 | 1990-12-01 | 1991-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-01 | 1994-12-01 | 1995-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-01 | 1998-12-01 | 1999-06-02 | $7700.00 | Window Closed / Lapsed |