ENCODING DEVICE AND METHOD, DECODING DEVICE AND METHOD, AND PROGRAM

摘要

The present technology relates to an encoding device and method, a decoding device and method, and a program, which enable improvement of audio quality.;A QMF sub-band power calculation unit calculates power of a QMF sub-band signal of a high frequency QMF sub-band among a plurality of the QMF sub-bands constituting an input signal. A high frequency sub-band power calculation unit carries out an operation to weight more a QMF sub-band power having larger power as for a sub-band including a number of the high frequency QMF sub-bands to calculate high frequency sub-band power of the sub-band. The multiplexing circuit multiplexes high frequency encoded data and low frequency encoded data for outputting. The high frequency encoded data is selected based on the high frequency sub-band power and obtained by encoding information used for obtaining a high frequency component of the input signal by estimating, and the low frequency encoded data is obtained by encoding low frequency components of the input signal. The present technology can be applied to encoding devices.

主权项

1. An encoding device comprising:
a sub-band dividing unit configured to divide a frequency band of an input signal and generate a first sub-band signal of a first sub-band on a high frequency side of the input signal; a first sub-band power calculation unit configured to calculate first sub-band power of the first sub-band signal based on the first sub-band signal; a second sub-band power calculation unit configured to carry out an operation to weight more the first sub-band power having larger power, and calculate second sub-band power of a second sub-band signal including a number of the continuous first sub-bands; a generating unit configured to generate data to obtain, by estimating, a high frequency signal of the input signal based on the second sub-band power; a low frequency encoding unit configured encode a low frequency signal of the input signal to generate low frequency encoded data; and a multiplexing unit configured to multiplex the data and the low frequency encoded data to generate an output code string.