Patent ID: 8644346

Claim:
A signal demultiplexing device, comprising: a frequency transformation unit which transforms a frame, which is an input signal inputted in a predetermined time interval, into a frequency-domain input signal which is a signal in the frequency domain; an input signal analysis unit which analyzes effectiveness of the inputted frame on generating a demultiplexing matrix which is used for demultiplexing; a selection control unit which selects the frames which have high effectiveness among the inputted frames; a data memory unit which stores the frequency-domain input signals of which the frames are selected by the selection control unit; and a demultiplexing matrix generation unit which generates the demultiplexing matrix for each of the inputted frames by use of the frequency-domain input signals which are stored in the data memory unit, wherein the selection control unit selects the frames which have high effectiveness by comparing the effectiveness of the inputted frame and the effectiveness of the frames which are selected by the selection control unit in the past.