Recording disk data playback apparatus

• US 4,698,695 A
• Filed: 09/16/1985
• Issued: 10/06/1987
• Est. Priority Date: 09/14/1984
• Status: Expired due to Term

• Current Assignee: Pioneer Electronic Corporation (Pioneer Corporation)
• Original Assignee: Pioneer Electronic Corporation (Pioneer Corporation)
• Inventors: Kosaka, Minoru, Banno, Tutomu
• Primary Examiner(s): McElheny, Jr., Donald
• Application Number:
  US06/776,707
• Time in Patent Office: 750 Days
• Field of Search: 358/342, 358/343, 358/338, 358/339, 360/73, 360/19.1, 369/50, 369/111, 369/59, 369/2, 369/49
• US Class Current: 386/222
• CPC Class Codes: G11B 19/28 Speed controlling, regulating, or indicating G11B19/24 takes precedence
• CPC Class Codes: G11B 20/10 Digital recording or reproducing
• CPC Class Codes: G11B 20/10527 Audio or video recording; Data buffering arrangements G11B20/12 - G11B20/18 take precedence
• CPC Class Codes: G11B 20/225 for reducing wow or flutter by controlling the speed of the record carrier G11B15/46, G11B19/28
• CPC Class Codes: G11B 7/005 Reproducing G11B7/0065 takes precedence
• CPC Class Codes: H04N 5/7605 on discs or drums H04N5/781, H04N5/805, H04N5/83, H04N5/85 take precedence
• CPC Class Codes: H04N 5/95 Time-base error compensation H04N5/932 takes precedence
• CPC Class Codes: H04N 9/802 involving processing of the sound signal H04N9/806, H04N9/835 take precedence
• CPC Class Codes: H04N 9/835 involving processing of the sound signal

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.

Claims

1. 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.