| 摘要 |
<p>PURPOSE:To make it possible to generate a received beam with random characteristics easily and economically with high precision by applying digital signal processing technique. CONSTITUTION:Input signals of K channels are sampled at a constant rate and converted by A-D converters 221-22k into digital codes, which are written in input memories 231-23k. On the other hand, data block consisting of N sampled values read from memories 231-23k are sent to FFTs processors 241-24k, where the next Fourier transformation comes into effect to calculate complex spectrums as many as N/2. Next, transfer functions in table memories 261-26k are multiplied by complex multipliers 251-25k by the above-mentioned spectrums as to every frequency component and the results are added by complex adder 27 covering all channels; and the results are Fourier-transformed reversely by FFT processor 28 and the result is written in output memory 29. The data are sequentially read out at a rate equal to the sampling rate of the input side.</p> |
