DIGITAL SIGNAL DEMULTIPLEXING DEVICE AND DIGITAL SIGNAL MULTIPLEXING DEVICE

摘要

It is possible to provide a digital signal demultiplexing device capable of demultiplexing a channel signal of an arbitrary frequency interval and a bandwidth and a digital signal multiplexing device capable of multiplexing channel signals. The digital signal demultiplexing device performs the discrete Fourier transform on an input signal, outputs a sample in a frequency band of each channel from samples of frequency region, adds a sample so that the number of samples of each channel is powered 2, and performs the discrete inverse Fourier transform with a length equal to the number of samples on the sample of each channel.The digital signal multiplexing device performs the discrete Fourier transform with the length equal to the number of samples of the input signals for a predetermined period, outputs samples in the frequency band of each channel from the samples of frequency region of each channel, and arranges the samples according to the frequency arrangement of each channel to perform the discrete inverse Fourier transform.