| 摘要 |
A method of retrieving data from a record carrier disc having rotary information tracks on which the data is recorded. A read head reads data from the tracks into a buffer memory, from which it is supplied to an output terminal. This permits continuous playback of the recorded information during temporary intervals when, due to mechanical shocks, the read head becomes misaligned relative to the tracks. After such a misalignment the read head becomes realigned at a subsequent track position, and as soon as data is again being correctly detected it is written into the buffer memory in a location therein which leaves a gap between the currently written data and that written before the shock occurred. When the disc rotation brings the read head into radial alignment with the position where the shock commenced, the read head is moved inward to return to that position and the gap in the buffer memory is filled by reading from the disc the data which was missed during the misalignment following the shock. The method is applicable to a shock FIFO memory for a CD audio player.
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