Patent ID: 8898053
Filing Date: 2014-11-25
Classification: G10L

Abstract:
1. An encoding apparatus, comprising: a first encoder that generates first encoded information by encoding a first channel signal; a first decoder that generates a first decoded signal by decoding the first encoded information; an adaptive filter that performs filter processing on the first decoded signal and generates a predicted signal of a second channel signal; an error signal generator that generates an error signal by obtaining an error between the second channel signal and the predicted signal; a second encoder that generates second encoded information by encoding the error signal; a second decoder that generates a decoded error signal by decoding the second encoded information; a storage that stores filter coefficients used in the filter processing; a first switch that switches a connection state from the storage to the adaptive filter, based on first detection information indicating presence/absence of transmission error, wherein the adaptive filter uses the first decoded signal and the decoded error signal to update the filter coefficients and, when the first switch connects the storage and the adaptive filter, the adaptive filter receives the filter coefficients of the past from the storage to use the filter coefficients of the past as the filter coefficients of the adaptive filter and performs the filter processing; a change detector that detects presence/absence of change of a sense of stereo of the first channel signal and the second channel signal and generating second detection information; and a second switch that switches a connection state from the adaptive filter to the storage based on the second detection information, wherein: when the second detection information indicates presence of change of the sense of stereo, the second switch-connects the adaptive filter and the storage; and when the second switch section connects the adaptive filter and the storage, the storage stores the filter coefficients updated in the adaptive filter.