Patent ID: 8311810
Filing Date: 2012-11-13
Classification: G10L

Abstract:
1. An audio coding apparatus that codes an input multi-channel audio signal, said apparatus comprising: a downmix signal generating unit configured to generate a first downmix signal by downmixing in a time domain the input multi-channel audio signal according to a downmix coefficient, the first downmix signal being one of a 1-channel audio signal and a 2-channel audio signal; a downmix signal coding unit configured to code the first downmix signal generated by said downmix signal generating unit in a bitstream with downmix compensation information; a first t-f converting unit configured to convert the input multi-channel audio signal into a multi-channel audio signal in a frequency domain; and a spatial information calculating unit configured to generate spatial information by analyzing the multi-channel audio signal in the frequency domain, the multi-channel audio signal in the frequency domain being obtained by said first t-f converting unit, and the spatial information being information for generating a multi-channel audio signal from a downmix signal.