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Spatial Audio Processing: MPEG Surround and Other Applications by Christof Faller, Jeroen Breebaart

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8.4 Binaural parameter synthesis

8.4.1 Mono down-mix

The synthesis process comprises reinstating the binaural parameters on a mono down-mix signal x(t) of the object signals. Using a frequency-domain representation, one frame of the down-mix signal is given by:

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The power in each band of this down-mix signal frame, px, is then given by:

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The reconstructed binaural signals Ŷt Ŷr are obtained using a matrix operation Wb that is derived for each parameter band (b) independently:

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with D(.) a decorrelator which generates a signal that has virtually the same temporal and spectral envelopes as its input, but is independent of its input. The matrix coefficients ensure that for each frame, the two binaural output signals Ŷt Ŷr have the desired levels, IPD and IC relations. The solution for Wb is given by (see Chapter 5 for a detailed explanation of these equations):

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with

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8.4.2 Extension towards ...

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