Missing clock detection circuit

Details Missing clock detection circuit Missing clock detection circuit

G - Physics

06

K

354/231

G06K 7/016 (2006.01) G11B 5/02 (2006.01) G11B 20/14 (2006.01)

Patent

CA 1041214

Title of the Invention MISSING CLOCK DETECTION CIRCUIT Abstract of the Disclosure A circuit for detecting digital data recorded on a magnetic recording medium is disclosed wherein data is detected by detecting a missing clock and fixed data at the missing clock location. Clock and data pulses are interleaved on the recording medium and encoded to distinguish data and detecting the missing clock by encoding data corresponding to signal absence into the bit position adjacent to the last bit of the missed clock bit when such condition is present. The clock and data bits are detected from the decoded signal read from the recording medium by timing the first period between succeeding bits which is of greater time duration than the interval between succeeding clock and data bits but shorter than the interval between succeeding clock bits having a data bit interposed therebetween. A second timing means times the second period which is of greater time duration than the inter- val between two succeeding clock bits but shorter than the interval between a clock and data bit adjacent to the next clock bit. The times are then compared to determine whether a missing clock has occurred and a correction code is generated.

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