| 摘要 |
PURPOSE:To reduce the circuit scale and also to reduce the cost by sharing a voltage control clock and a pseudo noise signal generator in both transmission and reception modes. CONSTITUTION:In a transmission mode, an information signal is the control signal of a voltage control clock 10 of a pseudo noise signal synchronization circuit 1. Then a 1st pseudo noise signal or a signal obtained by putting this pseudo noise signal on the intermediate frequency is transmited on the radio frequency. In a reception mode, a 2nd pseudo noise signal contained in the received signal undergoes the synchronous following by the circuit 1 and the phase error signal of a phase comparator 11 is used as a demodulated signal. The clock 10 and a pseudo noise signal generator 12 are shared by both transmission and reception circuits so that the circuit scale can be reduced. |
