Patent ID: 8214223
Filing Date: 2012-07-03
Classification: G10L,H04S

Abstract:
1. A method of operating an audio decoder to decode audio data that includes encoded blocks of N.n channels of audio data to form decoded audio data that includes M.m channels of decoded audio, M≧1, n being the number of low frequency effects channels in the encoded audio data, and m being the number of low frequency effects channels in the decoded audio data, the method comprising: accepting the audio data that includes blocks of N.n channels of encoded audio data encoded by an encoding method, the encoding method including transforming N.n channels of digital audio data, and forming and packing frequency domain exponent and mantissa data; and decoding the accepted audio data, the decoding including: wherein the time domain downmixing includes testing whether the downmixing data are changed from previously used downmixing data, and, if changed, applying cross-fading to determine cross-faded downmixing data and time domain downmixing according to the cross-faded downmixing data, and if unchanged, directly time domain downmixing according to the downmixing data.