| 摘要 |
<p>Apparatus and techniques for converting analog data, preferably audio signals, to digital information, which digital information is preferably recorded from two separate main channels (11, 12) onto main tracks (22a, 22b) and includes a third or backup track (22c) for recording thereon partial or most significant portions of that information recorded on the main tracks. The invention involves apparatus and techniques of each data group on each main track and the backup track; checking (27) for synchronization codes arranged between data groups; and checking (30) for a match of that appropriate portion of the main track data against the data on the backup track, with, when potentially erroneous or questionable data is detected, the invention providing for comparison of main and backup track data groupings (31) for determining which is most likely correct or, in the case where neither data grouping is identifiable as most likely correct, the invention provides for substitution of last correct data or integration between good data. The preferred invention incorporates clocking at the signal input for data stabilization, and first-in-first-out circuitry (32) at the output for reducing the effects of wow and flutter to produce a very high quality conversion of digital to analog form to pass to a speaker system. </p> |
