| 摘要 |
A demodulator demodulates a PSK communications signal using a synchronizer, a period window detector, and a logic device. The synchronizer provides a transition signal representing reference edges of the communication signal. The period window detector, coupled to the synchronizer, establishes a time interval based on the period of the transition signal. Finally, the logic device, having logic inputs coupled to the outputs of the period-window detector, yields a logic output signal. The demodulator preferably includes a carrier boundary detector for framing messages and minimizing noise detection in a manner that permits signal strength measurements over a wide dynamic range.
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