Multichannel Decorrelation In Spatial Audio Coding
First Claim
1. A method for processing a set of N audio signals, comprising filtering each of the N signals with a unique decorrelating filter characteristic, the characteristic being a causal linear time-invariant characteristic in the time domain or the equivalent thereof in the frequency domain, and, for each decorrelating filter characteristic, combining, in a time and frequency varying manner, its input and output signals to provide a set of N processed signals.
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Abstract
Each of N audio signals are filtered with a unique decorrelating filter (38) characteristic, the characteristic being a causal linear time-invariant characteristic in the time domain or the equivalent thereof in the frequency domain, and, for each decorrelating filter characteristic, combining (40, 44, 46), in a time and frequency varying manner, its input (Zi) and output (Z-i) signals to provide a set of N processed signals (X i). The set of decorrelation filter characteristics are designed so that all of the input and output signals are approximately mutually decorrelated. The set of N audio signals may be synthesized from M audio signals by upmixing (36), where M is one or more and N is greater than M.
81 Citations
19 Claims
- 1. A method for processing a set of N audio signals, comprising filtering each of the N signals with a unique decorrelating filter characteristic, the characteristic being a causal linear time-invariant characteristic in the time domain or the equivalent thereof in the frequency domain, and, for each decorrelating filter characteristic, combining, in a time and frequency varying manner, its input and output signals to provide a set of N processed signals.
- 2. A method according to claim 1 wherein each unique decorrelating filter characteristic is selected such that the output signal of each filter characteristic has less correlation with every one of the N audio signals than the corresponding input signal of each filter characteristic has with every one of the N signals and such that each output signal has less correlation with every other output signal than the corresponding input signal of each filter characteristic has with every other one of the N signals.
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14. A method according to claim 1, further comprising receiving parameters describing desired spatial relationships among said N processed signals, and wherein the degree of combining by said combining operates with the help of received parameters.
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14-1. (canceled)
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17. Apparatus adapted to perform the methods of any one of claims 1-4.
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17-2. (canceled)
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19. Apparatus for processing a set of N audio signals, comprising
means for filtering each of the N signals with a unique decorrelating filter characteristic, the characteristic being a causal linear time-invariant characteristic in the time domain or the equivalent thereof in the frequency domain, and, for each decorrelating filter characteristic, means for combining, in a time and frequency varying manner, its input and output signals to provide a set of N processed signals.
Specification