US4227221A
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PCM Recording apparatus
Assignee: Hitachi Ltd
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Filing: 1978-11-21
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Granted: 1980-10-07
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Expires: 1998-11-21
Abstract
Abstract A PCM recording apparatus is disclosed in which digitized left and right channel sample signals each having error detecting bits and a signal indicative of a correlation such as sum or difference of the two samples are recorded on a record medium in a predetermined arrangement, and an error in coding is detected from the correlation signal.
Inventors
- 👤 Yasunori Kanazawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:38
CPC Classifications
H; H04; H04H; H04H20/00; H04H20/86; H04H20/88; G; G11; G11B; G11B20/00; G11B20/10; G11B20/10527; G11B20/18; G11B20/1806; G11B23/00; G11B23/0007; H04S; H04S1/00; H04S1/007; G11B20/00992
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
68 words
A PCM recording apparatus comprising first means for deriving digitized sterophonic sound signal samples for left and right channels, each of said digitized samples including error detecting bits, second means for deriving a signal indicative of correlation such as sum or difference of the digitized left and right channel signals including the error detecting bits, and third means for recording the signals from said first and second means.
Claim 2
Dependent Claim
68 words
A PCM recording apparatus comprising first means for deriving digitized sterophonic sound signal samples for left and right channels, each of said digitized samples including error detecting bits, second means for deriving a signal indicative of correlation such as sum or difference of the digitized left and right channel signals including the error detecting bits, and third means for recording the signals from said first and second means.
Claim 3
Dependent Claim
53 words
A PCM recording apparatus according to claim 1, wherein a left channel sample, a right channel sample and a correlation signal such as a sum or difference signal of the left and right channel samples constitute a separate frame, respectively and each frame is recorded on a predetermined position on a record medium.
Claim 4
Dependent Claim
56 words
A PCM recording apparatus according to claim 1, wherein a left channel sample, a right channel sample and a correlation signal such as a sum or difference signal of the left and right channel samples are each packed in a different one of horizontal scan period and recorded on a record medium in a predetermined arrangement.
Claim 5
Dependent Claim
73 words
A PCM recording apparatus comprising first means for deriving digitized stereophonic sound signal samples for left and right channels, said digitized samples each including error detecting bits, second means for deriving correlation signals such as sum or difference signals of a current sample and an immediately preceding sample in left and right channels, respectively, together with error detecting bits therefor, and third means for recording the signals from said first and second means.
Claim 6
Dependent Claim
73 words
A PCM recording apparatus comprising first means for deriving digitized stereophonic sound signal samples for left and right channels, said digitized samples each including error detecting bits, second means for deriving correlation signals such as sum or difference signals of a current sample and an immediately preceding sample in left and right channels, respectively, together with error detecting bits therefor, and third means for recording the signals from said first and second means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-07 | 1984-04-07 | 1984-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-07 | 1988-04-07 | 1988-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-07 | 1992-04-07 | 1992-10-07 | $7700.00 | Window Closed / Lapsed |