Patent ID: 8818539
Filing Date: 2014-08-26
Classification: G10L

Abstract:
1. An audio encoding device, comprising: a processor; and a memory that stores a plurality of instructions, which when executed by the processor causes the processor to execute; transforming signals of channels included in an audio signal having a first number of channels into frequency signals, respectively, by time-frequency transforming the signals of the channels frame by frame, each frame having a predetermined time length; generating an audio frequency signal having a second number of channels, which is smaller than the first number of channels, by down-mixing the frequency signals of the channels; generating a low channel audio code by encoding the audio frequency signal; extracting space information representing spatial information of a sound from the frequency signals of the channels; calculating an importance representing a degree of how much the space information affects human hearing for each frequency based on the space information; correcting the space information so that the space information at a frequency band having an importance smaller than a predetermined threshold value is equalized to an adjacent frequency band direction; generating a space information code by encoding a difference of space information obtained by calculating a difference of values of the corrected space information in the adjacent frequency band direction; and generating an encoded audio signal by multiplexing the low channel audio code and the space information code.