Method and apparatus for generating an enhancement layer within a multiple-channel audio coding system
First Claim
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1. A multiple channel audio signal coding apparatus comprising:
- an encoder configured to generate a coded audio signal by coding a multiple channel audio signal that comprises a plurality of audio signals;
an enhancement layer encoder balance factor generator configured to generate a balance factor having a plurality of balance factor components each associated with an audio signal of the multiple channel audio signal;
an enhancement layer encoder gain vector generator configured to determine a gain value to be applied to the coded audio signal and to generate an estimate of the multiple channel audio signal based on the balance factor and the multiple channel audio signal, wherein the gain value is configured to minimize a distortion value between the multiple channel audio signal and the estimate of the multiple channel audio signal; and
a transmitter configured to transmit a representation of the gain value.
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Abstract
A method and apparatus are disclosed for generating a coded audio signal based on a multiple channel audio input 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.
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Citations
18 Claims
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1. A multiple channel audio signal coding apparatus comprising:
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an encoder configured to generate a coded audio signal by coding a multiple channel audio signal that comprises a plurality of audio signals; an enhancement layer encoder balance factor generator configured to generate a balance factor having a plurality of balance factor components each associated with an audio signal of the multiple channel audio signal; an enhancement layer encoder gain vector generator configured to determine a gain value to be applied to the coded audio signal and to generate an estimate of the multiple channel audio signal based on the balance factor and the multiple channel audio signal, wherein the gain value is configured to minimize a distortion value between the multiple channel audio signal and the estimate of the multiple channel audio signal; and a transmitter configured to transmit a representation of the gain value. - View Dependent Claims (2, 3, 4)
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5. A multiple channel audio signal coding apparatus comprising:
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an encoder configured to generate a coded audio signal by coding a multiple channel audio signal that comprises a plurality of audio signals; an enhancement layer encoder scaling unit configured to generate a plurality of candidate coded audio signals by scaling the coded audio signal with a plurality of gain values, wherein at least one of the candidate coded audio signals is scaled; a balance factor generator configured to generate 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; the scaling unit and the balance factor generator generate 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; a gain selector of the enhancement layer encoder configured to evaluate 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; a transmitter configured to transmit the representation of the optimal gain value. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for coding a multiple channel audio signal, the method comprising:
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receiving a multiple channel audio signal that comprises a plurality of audio signals; generating a coded audio signal based on the multiple channel audio signal; generating a balance factor having a plurality of balance factor components each associated with an audio signal of the multiple channel audio signal; determining 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, wherein the gain value is configured to minimize a distortion value between the multiple channel audio signal and the estimate of the multiple channel audio signal; and outputting a representation of the gain value. - View Dependent Claims (16, 17, 18)
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Specification