High order digital phase locked loop system

Details High order digital phase locked loop system High order digital phase locked loop system

H - Electricity

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H04L 7/02 (2006.01) G11B 20/14 (2006.01) H03L 7/06 (2006.01) H03L 7/085 (2006.01) H03L 7/099 (2006.01) H04L 7/033 (2006.01) H04L 25/40 (2006.01)

Patent

CA 1284362

HIGH ORDER DIGITAL PHASE-LOCKED LOOP SYSTEM ABSTRACT OF THE DISCLOSURE A digital data separator operates to separate data pulses from clock pulses in MFM encoded signals read from a magnetic disk system. The data separator includes a digital phase-locked loop system incorporating a variable length shift register which functions as a variable oscillator and programmed state machines which control the operation of the shift register and provides filtering functions. The state machines filter high frequency noise components from the incoming data signals and enables the system to accurately track frequency variations in the data stream while providing high tolerance to high frequency noise.

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