| 摘要 |
PURPOSE:To obtain the gain control system immune to interference by eliminating a narrow band interference wave with a simpler circuit configuration. CONSTITUTION:A receiver side uses a signal PN1 resulting from shifting a phase of a signal PNO used for spread modulation at a sender side. Moreover, a signal PN2 resulting from exclusively 0Ring the PN0, PN1. A reception signal and the PN1 are multiplied by a multiplier 1 to implement spread to an interference wave only. The spread signal is given to a band pass filter 2, in which part of the interference signal is eliminated and a correlation device 3 applies correlation calculation to the output and the PN2 to implement inverse spread. |
