Patent US4698695A successfully refreshed from Google Patents.
US4698695A
Expired / Lapsed
US
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Recording disk data playback apparatus
Assignee: Pioneer Corp
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Filing: 1985-09-16
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Granted: 1987-10-06
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Expires: 2005-09-16
Abstract
Abstract A recording disk playback apparatus which is compatible with playback of both compact audio disks (CDs), having only a digitized audio signal recorded thereon, and recording disks having video and audio signals recorded by frequency modulation thereon together with a superimposed digitized audio signal (LDDs), includes means whereby a read-out clock signal which reads out temporarily stored digitized audio data from a memory is held fixed in frequency when a CD is being played, with closed-loop control of the speed of a CD drive motor being also executed, to thereby eliminate jitter in the demodulated audio signal, while during playing of an LDD the read-out clock signal is phase-locked with a playback clock signal.
Inventors
- 👤 Minoru Kosaka
- 👤 Tutomu Banno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:27
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B19/00; G11B19/20; G11B19/28; G11B20/10527; G11B20/22; G11B20/225; G11B7/00; G11B7/004; G11B7/005; H; H04; H04N; H04N5/00; H04N5/76; H04N5/7605; H04N5/91; H04N5/93; H04N5/95; H04N9/00; H04N9/79; H04N9/80; H04N9/802; H04N9/82; H04N9/83; H04N9/835
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
229 words
A recording disk data playback apparatus capable of playback of a first type of recording disk having a signal recorded thereon which has been frequency modulated by a video signal and audio signal respectively, with first data which has been converted to a pulse train by digital modulation being superimposed thereon, and a second type of recording disk having recorded thereon second data which has been subjected to digital modulation processing to be converted to a pulse train, the apparatus comprising: demodulator means for demodulating a playback digital signal; write-in means for writing the demodulated output from said demodulator means into a memory in synchronism with a playback clock signal which is contained in said playback digital signal; clock signal generating means for generating a read-out clock signal, for reading out stored data from said memory; phase synchronization means for synchronizing the output from said clock signal generating means with said playback clock signal; drive means for controlling the speed of rotation of said second recording disk on the basis of an output from said phase synchronization means; means for inhibiting phase synchronization of said clock signal generating means by said phase synchronization means and for fixing the frequency of said read-out clock signal during playback of said second recording disk, and ; means for inhibiting speed control by said drive means during playback of said first recording disk.
Claim 2
Dependent Claim
229 words
A recording disk data playback apparatus capable of playback of a first type of recording disk having a signal recorded thereon which has been frequency modulated by a video signal and audio signal respectively, with first data which has been converted to a pulse train by digital modulation being superimposed thereon, and a second type of recording disk having recorded thereon second data which has been subjected to digital modulation processing to be converted to a pulse train, the apparatus comprising: demodulator means for demodulating a playback digital signal; write-in means for writing the demodulated output from said demodulator means into a memory in synchronism with a playback clock signal which is contained in said playback digital signal; clock signal generating means for generating a read-out clock signal, for reading out stored data from said memory; phase synchronization means for synchronizing the output from said clock signal generating means with said playback clock signal; drive means for controlling the speed of rotation of said second recording disk on the basis of an output from said phase synchronization means; means for inhibiting phase synchronization of said clock signal generating means by said phase synchronization means and for fixing the frequency of said read-out clock signal during playback of said second recording disk, and ; means for inhibiting speed control by said drive means during playback of said first recording disk.
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) | 1990-10-05 | 1991-04-06 | 1991-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-05 | 1995-04-06 | 1995-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-05 | 1999-04-06 | 1999-10-06 | $7700.00 | Window Closed / Lapsed |