Apparatus for encoding and decoding audio signal and method thereof
First Claim
1. A method for decoding an audio signal, the method comprising:
- receiving a downmix signal and a spatial information signal including spatial information and channel gain information, wherein the channel gain information comprises a low frequency enhancement (LFE) gain and a surround gain;
generating a multi-channel audio signal, including a LFE channel signal and at least one surround channel signal, by applying the spatial information to the downmix signal; and
generating a modified multi-channel audio signal by applying the channel gain information to the multi-channel audio signal in a time domain,wherein the step of applying the channel gain information includes;
applying the LFE gain to the LFE channel signal; and
applying the surround gain to the at least one surround channel signal.
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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.
107 Citations
11 Claims
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1. A method for decoding an audio signal, the method comprising:
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receiving a downmix signal and a spatial information signal including spatial information and channel gain information, wherein the channel gain information comprises a low frequency enhancement (LFE) gain and a surround gain; generating a multi-channel audio signal, including a LFE channel signal and at least one surround channel signal, by applying the spatial information to the downmix signal; and generating a modified multi-channel audio signal by applying the channel gain information to the multi-channel audio signal in a time domain, wherein the step of applying the channel gain information includes; applying the LFE gain to the LFE channel signal; and applying the surround gain to the at least one surround channel signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of encoding an audio signal, the method comprising:
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receiving a multi-channel audio signal including a low frequency enhancement (LFE) channel signal and at least one surround channel signal; generating a modified multi-channel audio signal by modifying an energy level of the LFE channel signal and the at least one surround channel signal included in the multi-channel audio signal; generating channel gain information based on the modified energy level and the multi-channel audio signal; generating a downmix signal by downmixing the modified multi-channel audio signal; and generating spatial information to upmix the downmix signal, based on the multi-channel audio signal, wherein the channel gain information includes a surround gain indicating a gain for the at least one surround channel signal and a LFE gain indicating a gain for the LFE channel signal.
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8. An apparatus for decoding an audio signal, comprising:
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a demultiplexer configured to extract, from a received signal, a downmix signal and a spatial information signal including spatial information and channel gain information, wherein the channel gain information comprises a low frequency enhancement (LFE) gain and a surround gain; a multi-channel generating unit configured to generate a multi-channel audio signal, including a LFE channel signal and at least one surround channel signal, by applying the spatial information to the downmix signal; and a channel level modifying unit configured to generate a modified multi-channel audio signal by applying the channel gain information to the multi-channel audio signal in time domain, wherein the channel level modifying unit is configured to apply the LFE gain to the LFE channel signal and apply the surround gain to the at least one surround channel signal. - View Dependent Claims (9, 10)
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11. An apparatus for encoding an audio signal, comprising:
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a specific channel level processing unit configured to generate a modified multi-channel audio signal by modifying an energy level of a low frequency enhancement (LFE) channel signal and at least one surround channel signal included in a multi-channel audio signal; a downmixing unit configured to downmix the modified multi-channel audio signal to form a downmix signal; and a spatial information generating unit configured to generate channel gain information based on the modified energy level and the multi-channel audio signal, and generate spatial information to upmix the downmix signal, based on the modified multi-channel audio signal, wherein the channel gain information includes a surround gain indicating a gain for the at least one surround channel signal and a LFE gain indicating a gain for the LFE channel signal.
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Specification