Audio signal decoder and method for producing a scaled reconstructed audio signal
First Claim
1. An apparatus that decodes a multiple channel audio signal, comprising:
- a decoder that receives a coded audio signal, a coded balance factor and a coded gain value;
a gain vector decoder of an enhancement layer decoder that generates a decoded gain value from the coded gain value;
a scaling unit of the enhancement layer decoder that scales the coded audio signal with the decoded gain value to generate a scaled audio signal;
a signal combiner that applies the coded balance factor to the scaled audio signal to generate a decoded multiple channel audio signal and outputs the decoded multiple channel audio signal.
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Accused Products
Abstract
During operation a multiple channel audio input signal is received and coded to generate a coded audio signal. A balance factor having balance factor components each associated with an audio signal of the multiple channel audio signal is generated. A gain value to be applied to the coded audio signal to generate an estimate of the multiple channel audio signal based on the balance factor and the multiple channel audio signal is determined, with the gain value configured to minimize a distortion value between the multiple channel audio signal and the estimate of the multiple channel audio signal. The representation of the gain value may be output for transmission and/or storage.
70 Citations
20 Claims
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1. An apparatus that decodes a multiple channel audio signal, comprising:
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a decoder that receives a coded audio signal, a coded balance factor and a coded gain value; a gain vector decoder of an enhancement layer decoder that generates a decoded gain value from the coded gain value; a scaling unit of the enhancement layer decoder that scales the coded audio signal with the decoded gain value to generate a scaled audio signal; a signal combiner that applies the coded balance factor to the scaled audio signal to generate a decoded multiple channel audio signal and outputs the decoded multiple channel audio signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for decoding a multiple channel audio signal, comprising:
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receiving a coded audio signal, a coded balance factor and a coded gain value; generating a decoded gain value from the coded gain value; scaling the coded audio signal with the decoded gain value to generate a scaled audio signal; applying the coded balance factor to the scaled audio signal to generate a decoded multiple channel audio signal; and outputting the decoded multiple channel audio signal. - View Dependent Claims (9)
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10. A method for coding a multiple channel audio signal, comprising:
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receiving a multiple channel audio signal that comprises a plurality of audio signals; coding the multiple channel audio signal to generate a coded audio signal; scaling the coded audio signal with a plurality of gain values to generate a plurality of candidate coded audio signals, wherein at least one of the candidate coded audio signals is scaled; generating a balance factor having a plurality of balance factor components each associated with an audio signal of the plurality of audio signals of the multiple channel audio signal; generating an estimate of the multiple channel audio signal based on the balance factor and the at least one scaled coded audio signal of the plurality of candidate coded audio signals; evaluating a distortion value based on the estimate of the multiple channel audio signal and the multiple channel audio signal to determine a representation of an optimal gain value of the plurality of gain values; outputting for at least one of transmission and storage the representation of the optimal gain value. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification