Pulse or digital communications – Repeaters – Testing
Patent
1981-08-05
1983-11-08
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
329112, 328133, H04L 2710, H04L 2718
Patent
active
044146752
ABSTRACT:
An MSK or OK-QPSK data signal demodulator includes a filter and limiter for filtering and amplitude limiting the data signal, a timer for generating a timing signal indicating elapsed time and a microcomputer coupled to the limited data signal from the limiter and the timing signal from the timer. The microcomputer is interrupted by each transition of the limited data signal and stores the timing signal from the timer. An interrupt routine of the microcomputer extracts the clock offset, which is an estimate of the relative location of the bit boundaries, and the phase intercept, which is an estimate of the phase of the data signal at the bit boundaries, from the timing signals.
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Chin Stephen
Gillman James W.
Hackbart Rolland R.
Motorola Inc.
Safourek Benedict V.
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