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Method for reproducing information recorded on an optical recording medium having a pre-formed recording track which is offset along its width to record frame sync signals of the information recorded on the medium

  • US 5,949,746 A
  • Filed: 02/25/1993
  • Issued: 09/07/1999
  • Est. Priority Date: 08/25/1989
  • Status: Expired due to Term
First Claim
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1. A method for reproducing main information data recorded on a recording track previously formed on an optical recording medium along a length direction of the recording track, the main information data being in frames each having a predetermined signal format, including a frame sync signal format and wherein reproduce-only frame sync signals having the same signal format as that of frame sync signals for the main information data are previously recorded for each frame by offsetting the recording track on the optical recording medium in a direction perpendicular to the length direction of the recording track, wherein the method for reproducing comprises the steps of:

  • detecting the offset of the recording track to produce a first signal representative of the reproduce-only frame sync signals,reproducing from the recording medium a second signal corresponding to the main information data, andusing a single decoding and demodulating circuit to decode and demodulate the first signal and the second signal to reproduce the frame sync signals of the main information data and the frame sync signals recorded by offsetting the recording track.

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