MULTI-CHANNEL AUDIO SIGNAL PROCESSING
First Claim
1. A method of processing a multi-channel audio signal, the method comprising the steps of:
- receiving an input sum signal representing a sum of a first audio signal and a second audio signal;
receiving an input difference signal representing a difference between the first and second audio signals;
decorrelating the sum signal to provide a decorrelated sum signal;
calculating a first gain from a cross-correlation of the sum and difference signals and a power of the sum signal;
calculating a second gain from a cross-correlation of the sum and difference signals and a power of the sum and difference signals;
calculating an output difference signal from a sum of the first gain applied to the sum signal and the second gain applied to the decorrelated sum signal; and
providing an output stereo audio signal from a combination of the output difference signal and the input sum signal.
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Accused Products
Abstract
The invention relates to multi-channel audio signal processing, in particular to a method of processing a multi-channel audio signal and to a signal processing device. A method of processing a multi-channel audio signal is disclosed, comprising the steps of: receiving an input sum signal (s) representing a sum of a first audio signal and a second audio signal; receiving an input difference signal (d) representing a difference between the first and second audio signals; decorrelating the sum signal to provide a decorrelated sum signal (sd); calculating a first gain (gs) from a cross-correlation of the sum and difference signals (s,d) and the power of the sum signal; calculating a second gain (gsd) from a cross-correlation of the sum and difference signals (s,d) and the power of the sum and difference signals; calculating an output difference signal (d′) from a sum of the first gain (gs) applied to the sum signal (s) and the second gain (gsd) applied to the decorrelated sum signal (sd); and providing an output stereo audio signal (l,r) from a combination of the output difference signal (d′) and the input sum signal (s).
46 Citations
13 Claims
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1. A method of processing a multi-channel audio signal, the method comprising the steps of:
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receiving an input sum signal representing a sum of a first audio signal and a second audio signal; receiving an input difference signal representing a difference between the first and second audio signals; decorrelating the sum signal to provide a decorrelated sum signal; calculating a first gain from a cross-correlation of the sum and difference signals and a power of the sum signal; calculating a second gain from a cross-correlation of the sum and difference signals and a power of the sum and difference signals; calculating an output difference signal from a sum of the first gain applied to the sum signal and the second gain applied to the decorrelated sum signal; and providing an output stereo audio signal from a combination of the output difference signal and the input sum signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13)
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11. A signal processing device for processing a multi-channel audio signal comprising an input sum signal representing a sum of a first audio signal and a second audio signal and an input difference signal representing a difference between the first and second audio signals, the device comprising:
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a decorrelation module configured to receive the sum signal and provide a decorrelated sum signal; a parameter estimation module configured to calculate a first gain from a cross-correlation of the sum and difference signals and a power of the difference signal and a second gain from a cross-correlation of the sum and difference signals and a power of the sum and difference signals; a first amplifier configured to receive the sum signal and amplify the sum signal according to the first gain; a second amplifier configured to receive the decorrelated sum signal and amplify the decorrelated sum signal according to the second gain; a summing module configured to sum output signals from the first and second amplifiers to provide an output difference signal; and an output stage configured to calculate an output stereo signal from a combination of the sum signal and the output difference signal from the summing module.
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Specification