Demodulation clock generator circuit
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United States of America Patent
Stats
-
Nov 21, 1989
Grant Date -
N/A
app pub date -
Jan 19, 1989
filing date -
Jun 30, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A demodulation clock generator circuit employed in a modulation system such as a bi-phase mark system is improved by including a frequency detector to speed up the initial processing of a data signal to be demodulated. The frequency detector generates a frequency detection signal which corresponds to a signal from an oscillator and a signal from a synchronization signal portion of the signal to be demodulated. The frequency detector includes a memory portion clocked by the oscillator for storing the states of the signal to be demodulated and a signal generating portion for supplying the frequency detection signal when information stored in the memory portion is the same as a synchronizing portion of the signal to be demodulated and has a frequency of less than a predetermined value.
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