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 audio 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, wherein said set of N audio signals are synthesized from M audio signals, where M is one or more and N is greater than M, further comprising upmixing the M audio signals to N audio signals prior to filtering each of the N audio signals with a unique decorrelating filter characteristic.
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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.
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Citations
17 Claims
- 1. A method for processing a set of N audio signals, comprising filtering each of the N audio 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, wherein said set of N audio signals are synthesized from M audio signals, where M is one or more and N is greater than M, further comprising upmixing the M audio signals to N audio signals prior to filtering each of the N audio signals with a unique decorrelating filter characteristic.
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17. Apparatus for processing a set of N audio signals, comprising
means for filtering each of the N audio 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, 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, and wherein said set of N audio signals are synthesized from M audio signals, where M is one or more and N is greater than M, further comprising an upmixer that upmixes the M audio signals to N audio signals prior to filtering each of the N audio signals with a unique decorrelating filter characteristic.
Specification