H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 27/22 (2006.01) H03D 7/00 (2006.01) H03D 13/00 (2006.01) H04L 27/233 (2006.01) H03D 7/16 (2006.01)
Patent
CA 2086279
Within a differential detection demodulator, a received signal is first quantized by a limiter amplifier and then subjected to frequency conversion by a frequency converter including: an exclusive OR element; a running average generator consisting of a shift register and an adder; and a comparator. In response to the output of the frequency converter, the phase comparator outputs a relative phase signal representing the phase shift of the received signal after frequency conversion relative to the phase reference signal. The phase comparator includes: an exclusive OR element; an absolute phase shift measurement means consisting of an adder and D flip-flop arrays and; and a D flip-flop serving as a phase shift polarity decision means. Alternatively, the phase detection circuit for generating the relative phase signal may include: a half-period detection means consisting of a delay element and an exclusive OR element; a phase reference signal generation means consisting of a modulo 2N counter; and a phase shift measurement means consisting of a phase inversion corrector and a D flip-flop array. The delay element delays the relative phase signal by one symbol period and the subtractor outputs the phase difference signal representing the phase transition over each symbol period of the received signal. The decision circuit obtains the demodulated data from the phase difference signal.
Marks & Clerk
Mitsubishi Denki Kabushiki Kaisha
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