| 摘要 |
The present technology pertains to an encoding device and method, decoding device and method, and program that are able to increase audio quality. A QMF sub-band power calculation unit calculates the power of the QMF sub-band signal of a high-range QMF sub-band among a plurality of QMF sub-bands that configure an input signal. With respect to a sub-band comprising a number of high-range QMF sub-bands, a high-range sub-band power calculation unit calculates the high-range sub-band power of the sub-band by performing a computation that puts greater weight on larger QMF sub-band powers. A multiplexing circuit multiplexes and outputs: high-range encoded data obtained by encoding information for obtaining, by means of estimation, the high-region portion of an input signal and selected on the basis of the high-region sub-band power; and low-range encoded data obtained by encoding the low-region component of an input signal. The present technology can be applied to an encoding device. |
