| 摘要 |
The present invention relates to an encoding device and method, a decoding device and method, and a program, with which a music signal can be reproduced with higher sound quality by expanding the frequency band. A bandpass filter divides an input signal into a plurality of sub-band signals. A feature quantity calculation circuit calculates feature quantities using the plurality of sub-band signals obtained by said division and/or the input signal. A high range sub-band power inferring circuit calculates an inferred value for the high range sub-band power by using the calculated feature quantities. A high range signal generating circuit generates a high range signal component by using the plurality of sub-band signals obtained by the division performed by the bandpass filter and the inferred value for the high range sub-band power calculated by the high range sub-band power inferring circuit. A frequency band expansion device expands the frequency band of the input signal by using the high range signal component generated by the high range signal generating circuit. The present invention can be applied, for example, to a frequency band expansion device, an encoding device, and a decoding device and the like. |
