| 摘要 |
<p>PURPOSE:To obtain a multimedium synchronization detection circuit with a simple circuit constitution by utilizing an error correction code (BCH code). CONSTITUTION:A serial/parallel conversion section 12 applies serial/ parallel conversion to a BCH code in a synchronization part in an independent data part, the address of ROMs 14, 16 outputting the code as a code word of each medium is designated respectively by using bits of the BCH code (from the most significant bit A15 to a half way bit A3), and when the humming distance of the synchronizingpart from a code word is within 3, 1 is read and in case of exceeding 3, 0 is read in response to the code word of each medium. Data selectors 18, 20 select data D0-D7 from the ROMs 14, 16 by using the half way bit A2 to the least significant bit A0 of the BCH code and output data S1, S2. A demultilexer 22 gives outputs M1-M3 to decoders 24-26 of each medium in response to the combination of the signals S1, S2.</p> |
