SIGNAL PROCESSING DEVICE AND METHOD, ENCODING DEVICE AND METHOD, DECODING DEVICE AND METHOD, AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To allow a musical signal to be reproduced in higher sound quality by expanding a frequency bandwidth.

SOLUTION: A sampling frequency converter converts a sampling frequency of the input signal into a desired sampling frequency, and a sub-band division circuit divides the input signal subsequent to the sampling conversion into sub-band signals of the number of sub-bands according to the sampling frequency. A pseudo high-frequency sub-band power calculation circuit calculates a pseudo high-frequency sub-band power of each high-frequency sub-band based on the low frequency-signal of the input signal and the coefficient table consisting of the coefficients for every high-frequency sub-band. A pseudo high-frequency sub-band power differential calculation circuit compares the high-frequency sub-band power and the pseudo high-frequency sub-band power of each high-frequency sub-band and selects one coefficient table from among a plurality of coefficient tables. Then, the coefficient index which specifies the coefficient table is encoded into a high-frequency coding data. The present invention can be applied to an encoding device.

COPYRIGHT: (C)2012,JPO&INPIT