Patent ID: 9177563
Filing Date: 2015-11-03
Classification: G10L

Abstract:
1. An encoding device comprising; subband dividing means configured to divide an input signal into a plurality of subbands, and to generate a low-frequency subband signal including a plurality of subbands on the low-frequency side, and a high-frequency subband signal including a plurality of subbands on the high-frequency side; feature amount calculating means configured to calculate feature amount that represents features of the input signal based on at least any one of the low-frequency subband signal and the input signal; smoothing means configured to subject the feature amount to smoothing; pseudo high-frequency subband power calculating means configured to calculate pseudo high-frequency subband power that is an estimated value of power of the high-frequency subband signal based on the smoothed feature amount and a predetermined coefficient; selecting means configured to calculate high-frequency subband power of the high-frequency subband signal from the high-frequency subband signal, and to compare the high-frequency subband power and the pseudo high-frequency subband power to select a coefficient from a plurality of coefficients; high-frequency encoding means configured to encode coefficient information for obtaining the selected coefficient, and smoothing information relating to the smoothing to generate high-frequency encoded data; low-frequency encoding means configured to encode a low-frequency signal of the input signal to generate low-frequency encoded data; and multiplexing means configured to multiplex the low-frequency encoded data and the high-frequency encoded data to obtain an output code string for transmitting to a playback device including a decoding device.