SIGNAL PROCESSING APPARATUS AND SIGNAL PROCESSING METHOD, ENCODER AND ENCODING METHOD, DECODER AND DECODING METHOD, AND PROGRAM

摘要

Disclosed is a signal processing device and method, an encoding device and method, a decoding device and method, and a program that enables music signals to be reproduced with higher sound quality, by enlarging the frequency band. A target processing segment for the encoding device is a segment comprised of a frame (16) and the encoding device outputs, for each target processing segment, high-band encoding data for obtaining high-band components of an input signal and low-band encoding data, wherein low-band signals in an input signal have been encoded. A coefficient used for estimating high-band components is selected for each frame at this time and the target processing segments are separated into continuous frame segments comprised of continuous frames with the same selected coefficient. Information that shows the length of each continuous frame segment, information that shows the number of continuous frame segments included in the target processing segment, and high-band encoding data comprising a coefficient index which shows the coefficients selected for each continuous frame segment are generated. This method can be applied to encoding devices.