Patent US4397011A successfully refreshed from Google Patents.
US4397011A
Expired / Lapsed
US
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Apparatus for reproducing disc record
Assignee: Sony Corp
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Filing: 1981-09-21
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Granted: 1983-08-02
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Expires: 2001-09-21
Abstract
Abstract An apparatus for reproducing a disc record on which a PCM signal is recorded in run length limited code includes an input terminal for receiving a reproduced signal from the disc record; a detecting circuit for detecting the maximum or minimum transition interval contained in the reproduced signal and for producing a detecting signal in response thereto, and a comparing circuit for comparing the detecting signal with a reference signal corresponding to the maximum or minimum transition interval during the rotation of the disc record at a predetermined velocity, and for producing a control signal in response to said comparisons to be supplied to a servo circuit for controlling the rotation of the disc record.
Inventors
- 👤 Hiroshi Ogawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:58
CPC Classifications
G; G11; G11B; G11B19/00; G11B19/20; G11B19/24
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
114 words
An apparatus for reproducing a disc record on which a PCM signal is recorded in run length limited code, said apparatus comprising: (a) an input terminal for receiving a reproduced signal from the disc record; (b) a detecting circuit for detecting the maximum or minimum transition interval contained in said reproduced signal and for producing a detecting signal in response thereto; and (c) a comparing circuit for comparing said detecting signal with a reference signal corresponding to the maximum or minimum transition interval during rotation of the disc record at a predetermined velocity and for producing a control signal to be provided to a servo circuit for controlling the rotation of the disc record.
Claim 2
Independent Claim
114 words
An apparatus for reproducing a disc record on which a PCM signal is recorded in run length limited code, said apparatus comprising: (a) an input terminal for receiving a reproduced signal from the disc record; (b) a detecting circuit for detecting the maximum or minimum transition interval contained in said reproduced signal and for producing a detecting signal in response thereto; and (c) a comparing circuit for comparing said detecting signal with a reference signal corresponding to the maximum or minimum transition interval during rotation of the disc record at a predetermined velocity and for producing a control signal to be provided to a servo circuit for controlling the rotation of the disc record.
Claim 3
Dependent Claim
54 words
An apparatus according to claim 1, wherein said detecting circuit includes a saw-tooth wave generator for providing a saw-tooth wave during predetermined transition intervals of said reproduced signal and a peak-hold circuit for holding a peak value of the amplitude of said saw-tooth wave and for providing said comparing circuit with said peak value.
Claim 4
Dependent Claim
121 words
An apparatus according to claim 1, wherein said detecting circuit includes clock generating means for generating a clock signal having a shorter period than said maximum transition interval, counter means for counting said clock signal during predetermined transition intervals of said reproduced signal, first register means for receiving the value contained in said counter means, second register means for receiving the value contained in said first register means as said detecting signal when the value contained in said second register means is smaller than the value contained in said first register means, and wherein said comparing circuit is provided with the value contained in said second register means as the detecting signal and a reference data signal as said reference signal.
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) | 1986-08-01 | 1987-01-31 | 1987-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-01 | 1991-01-31 | 1991-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-01 | 1995-01-31 | 1995-08-02 | $7700.00 | Window Closed / Lapsed |