| 摘要 |
PURPOSE:To decrease the circuit scale by decomposing a non-cyclic type digital filter at each input line into 1/4 of a sampling frequency and using in common a decomposed component to be made common to the input line to decrease the required number of operation. CONSTITUTION:The signals of 7 channels on an input lines x1-x3 are converted digitally at each line by A/D converters 9-1-9-3. In extracting a desired signal on an output line y1, the non-cyclic type digital filters decomposed respectively into 1/4 of the sampling frequency are used to calculate non-common components 01-171, 02-172 and 03-173, after the result is added 10-1-10-18, the operation corresponding to a filter is performed by common components 20-1- 20-18, and the result is summed by an adder 30 and applied to a D/A converter 40. As a result, the FDM signal of a desired channel on the line y1 is obtained. |
