| 摘要 |
A sound encoding device enabling the amount of delay to be kept small and the distortion between frames to be mitigated. In the sound encoding device, a window multiplication part ( 211 ) of a long analysis section ( 21 ) multiplies a long analysis frame signal of analysis length M 1 by an analysis window, the resultant signal multiplied by the analysis window is outputted to an MDCT section ( 212 ), and the MDCT section ( 212 ) performs MDCT of the input signal to obtain the transform coefficients of the long analysis frame and outputs it to a transform coefficient encoding section ( 30 ). The window multiplication part ( 221 ) of a short analysis section ( 22 ) multiplies a short analysis frame signal of analysis length M 2 (M 2 <M 1 ) by an analysis window and the resultant signal multiplied by the analysis window is outputted to the MDCT section ( 222 ). The MDCT section ( 222 ) performs MDCT of the input signal to obtain the transform coefficients of the short analysis frame and outputs it to the transform coefficient encoding section ( 30 ). A transform coefficient encoding section ( 30 ) encodes these transform coefficients and outputs them.
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