Apparatus for Encoding and Decoding Audio Signal and Method Thereof
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Abstract
A method and/or apparatus for encoding and/or decoding an audio signal is disclosed, in which a downmix gain is applied to a downmix signal in an encoding apparatus which, in turn, transmits, to a decoding apparatus, a bit stream containing information as to the applied downmix gain. The decoding apparatus recovers the downmix signal, using the downmix gain information. A method and/or apparatus for encoding and/or decoding an audio signal is also disclosed, in which the encoding apparatus can apply an arbitrary downmix gain (ADG) to the downmix signal, and can transmit a bit stream containing information as to the applied ADG to the decoding apparatus. The decoding apparatus recovers the downmix signal, using the ADG information. A method and/or apparatus for encoding and/or decoding an audio signal is also disclosed, in which the method and/or apparatus can also vary the energy level of a specific channel, and can recover the varied energy level.
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Citations
51 Claims
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1-19. -19. (canceled)
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20. A method for decoding an audio signal, the method comprising:
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receiving the audio signal; extracting a downmix signal (DS) from the audio signal, the downmix signal comprising plural channels; extracting downmix gain information (DGI) from the audio signal; and selectively applying a first downmix gain to a first channel of the DS based on the DGI. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 49, 50, 51)
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35. A method for encoding an audio signal, the method comprising:
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generating a downmix signal (DS) and a spatial information signal from a multi-channel audio signal, the downmix signal comprising plural channels; applying a first downmix gain to a first channel of the downmix signal; and multiplexing the downmix signal and the spatial information signal to create the audio signal, the audio signal having downmix gain information (DGI) embedded therein. - View Dependent Claims (36, 37, 38, 39)
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40. An apparatus for decoding an audio signal, comprising:
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a demultiplexer configured to separate a downmix signal (DS) and a spatial information signal from a bitstream of the audio signal, the downmix signal including plural channels; a downmix gain applying unit to apply a first downmix gain to a first channel of the downmix signal based on extracted downmix gain information (DGI); and a multi-channel generating unit configured to transform the downmix gain-applied downmix signal to a multi-channel audio signal, using the spatial information signal. - View Dependent Claims (41, 42, 43, 44)
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45. An apparatus for encoding an audio signal, comprising
a downmixing unit configured to generate a downmix signal (DS) having plural channels from a multi-channel audio signal; -
a spatial information generating unit configured to extract a spatial information signal from the multi-channel audio signal; and a downmix gain applying unit configured to apply a first downmix gain to a first channel of the downmix signal and to embed downmix gain information (DGI) into one of the downmix signal and the spatial information signal. - View Dependent Claims (46, 47, 48)
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Specification