SIGNAL PROCESSING APPARATUS AND SIGNAL PROCESSING METHOD

摘要

A signal processing apparatus generates a window signal, transforms the window signal into a frequency spectrum, and adjusts an amplitude component of the frequency spectrum. Then, the signal processing apparatus applies inverse transform to the amplitude component after adjustment and to a phase component of the frequency spectrum to generate a frame signal, and identifies an overlap segment such that the absolute value of the amplitude of the frame signal at at least one end of the overlap segment becomes smaller than the absolute value of the amplitude of the frame signal at a corresponding end of an overlapping section. Then, in the identified segment, the signal processing apparatus adds and compounds the frame signal corresponding to an immediately preceding frame and the frame signal corresponding to a processing-target frame.

主权项

1. A signal processing apparatus equipped with a processor which executes a process to:
generate a first frame signal by multiplying an input signal divided into frames of a prescribed frame length by a prescribed first window function; transform the first frame signal into a frequency spectrum; adjust an amplitude component of the frequency spectrum; apply inverse transform to the amplitude component after adjustment and to a phase component of the frequency spectrum to generate a second frame signal in a time domain; identify a segment in an overlapping section between a processing-target frame and an immediately preceding frame such that an absolute value of an amplitude of the second frame signal at at least one end of the segment becomes smaller than an absolute value of an amplitude of the second frame signal at a corresponding end of the overlapping section; and in the identified segment, add and compound the second frame signal corresponding to the immediately preceding frame and the second frame signal corresponding to the processing-target frame.