| 摘要 |
PURPOSE:To reduce hardware in quantity and to reduce the titled modulator in size and weight of a device by using a detecting circuit and an identifying circuit with time division and demodulating two systems orthogonally intersecting with each other in offset QPSK. CONSTITUTION:A reference carrier is reproduced from an input offset QPSK demodulating signal 1 by a carrier reproducing circuit 15, the phase of the reproduced carrier is shifted by pi/2 by a pi/2 phase shifter 16 and the reference carrier is selected by a carrier selecting circuit 27 and multiplied by a modulating signal 1 in a mixer 17. A higher harmonic component is removed from the output of the mixer 17 by a low pass filter 19 and identified by the identifying circuit 22 and the identified timing signal is outputted from a timing circuit 26 and an identification pulse is outputted from an identification pulse generating circuit 28.
|
