Signal transferring

Details Signal transferring Signal transferring

G - Physics

11

B

352/16, 354/223

G11B 20/18 (2006.01)

Patent

CA 1054254

SIGNAL TRANSFERRING Abstract In a magnetic recording system or other data signal trans- fer apparatus, signal blocks of indeterminate length are handled with fixed length code record segments. Enhanced error detection and correction is provided not only on the data bits in each segment, but also on block check hits. When less than the total number of data bits to be transferred is insufficient to fill a fixed length segment, a residual segment is transferred. The residual segment preferably consists of the residual data bits, a check field (CRC) on the data bits as transferred through a buffer system, plus padding bits to make the total number of bits equal to a full length segment. Immediately following the residual segment is a check bit segment which contains a second check (CRC) character. To facilitate checking, a dual modulus counting scheme is employed to determine the number of CRC check hits to be included in the check bit segment. If the number of segments is odd, then an odd number of CRC bytes is transferred. If the total number of segments is even, then are even number of CRC bytes is transferred. Padding bytes make up the remainder of the check bit segment. The odd/even count between the successive segments is also used as a format check.

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