Audio spatial environment down-mixer
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United States of America Patent
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Issued Date -
May 18, 2006
app pub date -
Oct 28, 2005
filing date -
Oct 28, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An audio spatial environment engine is provided for converting from an N channel audio system to an M channel audio system, such as in a dynamic down-mixer where N and M are integers and N is greater than M. The dynamic down-mix methodology consists of a static down-mix system utilizing an intelligent analysis and correction loop. The original N-channel audio signals are provided to a static down-mix process which produces a down-mixed M-channel audio signal. That M-channel audio signal is provided to an up-mix process which generates a subsequent N-channel audio signal. Any spectral, temporal, or spatial inaccuracies between the original N-channel audio and the subsequent up-mixed N-channel audio are then identified and corrected in the down-mixed M-channel audio signal over a plurality of frequency bands generating the final down-mixed M-channel audio signal. The corrections performed on the down-mixed M-channel audio signal consist of modifications to the relevant inter-channel spatial cues such as inter-channel level difference (ICLD) and inter-channel coherence (ICC) per frequency band.
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