Clock recovery system in digital rotary scan magnetic playback d

Details Clock recovery system in digital rotary scan magnetic playback d Clock recovery system in digital rotary scan magnetic playback d

1985-07-17

1986-08-19

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

375120, G11B 509, H03D 324

Patent

active

046072969

ABSTRACT:
An improved clock recovery system for use in digital rotary scan magnetic playback devices utilizing a phase locked loop. The clock signal recovered from the playback data has a phase error with a periodic component caused by time base variations in the playback data and a random noise component due to playback channel noise. The phase locked loop of the invention tracks the periodic component, while it suppresses the random noise component. The improved system is suitable for tracking wide bandwidth dynamic time base variations in the playback data without introducing phase errors caused by random noise into the recovered clock signal.

REFERENCES:
patent: 4191976 (1980-03-01), Braun

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