| 摘要 |
PURPOSE:To reduce spectral deterioration caused by a wide band transmission, by grasping in advance a transmission line characteristic, enhancing partially and sending the output spectrum of a transmitting side so as to negate in characteristic, and correcting a received spectrum by a receiving side. CONSTITUTION:Transmitting information S1 is diffused by a balanced modulator 11 a diffusion code from a diffusion code generator 13 and goes to a transmitting signal S2. The signal S2 is modulated by a carrier wave of a carrier wave oscillator 14 by a balanced modulator 12 and goes to a transmitting signal S3, and it is enhanced as to its spectrum by a spectrum amplifier 15, goes to a transmitting signal S7 and it is sent out. The spectrum increased quantity is set to such a value as negates a transmission line characteristic grasped in advance. In the receiving side, it is brought to a high frequency amplification 21 and corrected so as to reduce spectral deterioration by a spectrum correcting device 26, brought to a reverse diffusion by the same diffusion code as that of the transmitting side from a diffusion code generator 24, in a balanced modulator 22, and outputted as a signal S10 to a base band demodulator 23. The demodulator 23 demodulates the signal S10 by a signal from a local oscillator 25 and outputs a transfer signal S11. |
