| 摘要 |
PURPOSE:To reduce a hardware by applying a common modulator-demodulator circuit using a digital transmultiplexer for inserting a converting circuit, which converts a sampling frequency. CONSTITUTION:A FDM (frequency division multi) signal is sampled by an A/D converter 2 and converted into a digital signal. The FDM signal converted to the digital signal is inputted to a digital transmultiplexer 3 and converted into a time division multi (TDM signal). The digital transmultiplexer 3 channel- separates the inputted FDM signal. Furthermore, after the FDM signal is converted into a based band signal, it is taken as a TDM signal by sampling each channel signal, inputted to an interpolation orthogonalized filter 4, led to a demodulating circuit 5 and a data signal of the plural number of the original channel is demodulated and regenerated. |
