Patent ID: 8831960
Filing Date: 2014-09-09
Classification: G10L,H04S

Abstract:
1. An audio encoding device comprising: a processor; and a memory that stores a plurality of instructions, which when executed by the processor cause the processor to execute, a time-frequency converting instruction that conducts time-frequency conversion of channel signals included in an audio signal having a plurality of channels in frame units having a certain length of time to convert the channel signals to respective frequency signals; a downmixing instruction that generates a main signal representing a major component of a first channel and a second channel among the plurality of channels, and a residual signal that is a component orthogonal to the main signal by downmixing a frequency signal of the first channel and a frequency signal of the second channel; a weight determining instruction that obtains a decoding value predicted from the frequency signal of the first channel and a decoding value predicted from the frequency signal of the second channel, obtains signal components affecting each other between the first channel and the second channel in the residual signal based on the decoding value of the first channel and the decoding value of the second channel, and determines a weighting coefficient with respect to the residual signal according to the signal components; a weighting instruction that uses the weighting coefficient to add weight to the residual signal; a residual signal encoding instruction that encodes the weighted residual signal the weighting coefficient; and a main signal encoding instruction that encodes the main signal.