| 摘要 |
PURPOSE:To attain simultaneous transmission/reception even when interruption from the transmission side to the reception side by using a signal generated from a spread spectrum signal at transmission so as to compress and eliminate and interference wave in the transmission wave at reception state. CONSTITUTION:A reception signal (signal wave + interference wave) amplified by an amplifier 5 is multiplied with a 1st compression signal (a signal inverting the polarity of a spread spectrum signal at transmission state) generated by a compression/spread signal generator 4 by a multiplier (modulator) M3 to attain modulation. Thus, the spectrum of the signal wave is spread at an output D to be in broad band and the interference is compressed to be a narrow band because it is demodulated conversely. In supplying a signal (signal wave + interference wave) at the output D to a narrow band elimination circuit 6, most of the compressed interference wave and part of the spread signal wave are eliminated and the remaining most signal wave component is transmitted as it is and a signal wave of a prescribed spectrum signal is obtained at an output E. Moreover, the signal wave at the output E is demodulated and the signal wave of a narrow band nearly equal to the original waveform is obtained at the output F and in demodulating it at an information code demodulator 7, the desired information is obtained. |
