Data demodulation using an asynchronous clock

Details Data demodulation using an asynchronous clock Data demodulation using an asynchronous clock

2003-08-26

2009-12-01

Chang, Joseph (Department: 2817)

Demodulators

Pulse or interrupted continuous wave demodulator

Pulse width demodulator

C341S053000

Reexamination Certificate

active

07626451

ABSTRACT:
A method and accompanying circuitry for asynchronous data demodulation uses sorted pulsewidth measurement based on an asynchronous clock. Lock-on of the data stream by such a system is accomplished by measured pulsewidth, rather than inferred frequency. The method broadly comprises the steps of measuring a temporal aspect of the asynchronous clock, and locking onto the data stream in accordance with the measured periods. In the preferred embodiment, the temporal aspect is a ratio of measured periods. Conveniently, a ratio of 2:1 may be used.

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