Digital data recovery circuit

Details Digital data recovery circuit Digital data recovery circuit

H - Electricity

03

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352/10.3, 352/24

H03L 7/08 (2006.01) G11B 27/30 (2006.01) H03L 7/087 (2006.01) H04L 27/227 (2006.01) H04N 9/79 (2006.01) H04N 9/82 (2006.01) H04N 9/87 (2006.01)

Patent

CA 1248221

ABSTRACT OF THE DISCLOSURE A digital data recovery circuit for recovering digital data recorded on a magnetic record medium along with still-image video signals in a frequency multiplexed relationship employs two phase-control loops, in which the first loop corrects absolute or DC phase errors and the second phase-control loop corrects AC phase errors evidenced as abrupt phase shifts of the digital data signal caused by changes in rotation of the magnetic record by using a horizontal synchronization signal derived from the video signal, and in which the outputs of the loop filters included in the first and second phase-control loops, respectively, are combined to provide a control signal for a voltage controlled oscillator that provides a demodulating carrier signal so that a synchronous detector can detect the digital data signal, thereby to cause the synchronous detector to lock onto even abrupt phase shifts in the carrier of the digital data signal.

452151

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