H - Electricity – 04 – L
Patent
H - Electricity
04
L
354/68
H04L 27/22 (2006.01) H03D 3/00 (2006.01) H04L 27/233 (2006.01) H04L 27/18 (2006.01)
Patent
CA 1057857
DIGITAL DEMODULATOR FOR PHASE-MODULATED WAVEFORMS ABSTRACT OF THE DISCLOSURE Digital logic apparatus for demodulating a received phase-modulated carrier wave wherein phase-shifts between successive signalling intervals encode data elements. A shirt register serially stores periodic samples of a squared version of the received wave. Exclusive OR-gates compare pairs of stored wave samples, each pair comprising a sample from a previous signalling interval and a sample from a current signalling interval. At least one of the exclusive OR-gates derives synchronizing signals for a local timing generator. For each data element, an integrator is associ- ated with one of the exclusive OR-gates to accumulate a count related to the time during which pairs of similar samples are sensed by its exclusive OR-gate during each signalling interval. The integrator registering the highest count at the end of a given data interval signifies the data element received during that interval. An alternate embodi- ment is disclosed for less critical applications wherein outputs from digital filters indicate the received data elements. -1-
218510
Glasson Jerry M.
King Ira S.
LandOfFree
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