Patent ID: 8831152
Filing Date: 2014-09-09
Classification: H04L

Abstract:
1. A delay detector circuit that performs a part of decoding processing for decoding data transmitted by a transmitter apparatus based on a received wave of a two-phase modulation method, the delay detector circuit further comprising: a limiter amplifier that transforms the received wave into a rectangular wave signal and amplifies the rectangular wave signal; a delay correlation operation unit that performs a delay correlation operation on an output of the limiter amplifier; an acquisition unit that determines whether the received wave is a communication signal transmitted by the transmitter apparatus based on an output of the delay correlation operation unit; and an output unit that outputs the output of the delay correlation operation unit to a decoding unit that decodes data based on the output of the delay correlation operation unit, wherein the acquisition unit further comprises: a pattern candidate storage unit that stores, in advance, a plurality of candidates for a shape of one symbol as pattern candidates; a shape generation unit that generates a shape of one symbol based on the output of the delay correlation operation unit; a comparison unit that compares the shape of one symbol generated by the shape generation unit and each of the plurality of pattern candidates; and a conformance determination unit that determines that the received wave is a communication signal transmitted by the transmitter apparatus when the shape of one symbol generated by the shape generation unit and any of the plurality of pattern candidates match for a plurality of times as a result of the comparison by the comparison unit.