Patent ID: 8818818
Filing Date: 2014-08-26
Classification: G10L,H04B,H04N

Abstract:
1. An audio encoding device for conducting grouping of a subband signal obtained by frequency-converting an input audio signal in a time direction and a frequency direction for each frame unit, and encoding the signal for each unit of the grouping, characterized in comprising: a candidate extraction unit for calculating a candidate for a group boundary in the time direction; a maximum value generation unit for generating a maximum value of a group number in the time direction; a time group generation unit for employing said candidate, thereby to conduct the grouping in the time direction so that a space of the boundary of the group being generated in the time direction becomes equal to or more than a constant and yet the group number in the time direction becomes equal to or less than said maximum value, and to generate time direction group information; and a frequency group generation unit for conducting the grouping in the frequency direction by employing said maximum value and said time direction group information, wherein said maximum value of said group number is made variable according to coding quantity information, wherein a maximum time group quantity is determined in response to a buffer residual quantity, where the coding quantity information is the buffer residual quantity; wherein the candidate for the group boundary in time direction is selected by comparing change in energy information of three successive time groups.