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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
First Claim
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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.

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