| 摘要 |
PROBLEM TO BE SOLVED: To dispense with a central transmitter generating a sine wave frequency signal with less distortion, a relay amplifier interrupting channel noise and a band pass filter. SOLUTION: Each device is provided with a DSP processing board, each processing function is designed as each subroutine module, and combining required subroutines among them realizes a central reception function, a relay amplifier function and a central reception function. The central transmitter 1 applies inverse G Fourier transform processing to plural frequency values to obtain oscillated frequency signals (D1-Fn). The central receiver applies Fourier transform processing to a received signal to discriminate the presence of the frequency signal and to detect an on/off signal from a detector. The relay amplifier 2 has the same functions as the central reception function and the central transmission function, introduces a detection signal on the basis of the received signal and generates and transmits a frequency signal in response to the detection signal. The FFT processing can interrupt a channel noise. |
