Patent ID: 8351622
Filing Date: 2013-01-08
Classification: H04S

Abstract:
1. An audio mixing device comprising: a primary audio decoder for decoding primary audio data into primary audio signals in multiple channels; a supplementary audio decoder for decoding supplementary audio data into supplementary audio signals in multiple channels; a decision circuit for determining, based on a decision of analysis of control data that indicates whether or not supplementary audio data is included, whether the supplementary audio data is included or not; and a mixer for generating an M-channel composite audio signal by adding the supplementary audio signals to the primary audio signals on a channel-by-channel basis and for converting the M-channel composite audio signal into N-channel audio signals, where N<M, based on either a first mixing coefficient group or second mixing coefficient group; wherein the supplementary audio decoder is able to accept the supplementary audio data, of which the acoustic image orientation moves, and wherein the first and second mixing coefficient groups are set by the decision circuit so that the N-channel audio signals have an acoustic image orientation that is closer to the acoustic image orientation of the supplementary audio data when converted by the mixer using the first mixing coefficient group than when converted by the mixer using the second mixing coefficient group, and wherein if the decision circuit decides that the supplementary audio data be included, the mixer converts the composite audio signal into the N-channel audio signals using the first mixing coefficient group.