Decoding circuit null of baihue - zu BPSK

摘要

PURPOSE: To provide the decoding circuit of biphase BPSK signals strong to noise by circuit constitution not using a capacitor. ;CONSTITUTION: Clocks corresponding to the half bit of a first half among two half bits for forming the data pair of biphase signals are prepared from the biphase signals outputted from a BPSK demodulator 1 by a pair judgement circuit 3 and a clock reproduction circuit 2 and a carrier pulse immediately after the clock is obtained by a carrier extraction circuit 5. Then, the biphase signals are AD converted in an AD conversion circuit 8 with the carrier pulse and the carrier pulse for which the pulse is delayed for the half bit period as sampling clocks. Then, by inputting timewisely sequential two pieces of the data values of the AC conversion output to a subtraction circuit 10, the subtracted result of the data pairs of the biphase signals is obtained and thus, the code judgement of the biphase signals is performed.;COPYRIGHT: (C)1996,JPO