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Method and apparatus for encoding and decoding an audio signal

An audio signal and signal technology, applied in the field of encoding and/or decoding audio signals, can solve problems such as sound level loss of multi-channel audio signals

Active Publication Date: 2008-08-13
LG ELECTRONICS INC
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Problems solved by technology

[0005] Another object of the present invention is to solve the problem of sound level loss of a multi-channel audio signal by applying an arbitrary down-mix gain to the down-mix signal of the multi-channel audio signal
[0006] Another object of the present invention is to solve the problem of sound level loss of a multi-channel audio signal by applying a specific channel gain to a specific channel of the multi-channel audio signal

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  • Method and apparatus for encoding and decoding an audio signal
  • Method and apparatus for encoding and decoding an audio signal
  • Method and apparatus for encoding and decoding an audio signal

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Embodiment Construction

[0040] Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

[0041] Figure 1 illustrates a method for enabling humans to recognize spatial information in an audio signal.

[0042] Coding of multi-channel audio signals utilizes the fact that since humans can recognize audio signals three-dimensionally, audio signals can be expressed in the form of three-dimensional spatial information using multiple parameter sets.

[0043] "Spatial parameters" for representing spatial information of a multi-channel audio signal include Channel Level Difference (CLD), Inter-Channel Coherence (ICC), and Channel Time Difference (CTD). CLD represents the energy difference between the two channels. ICC represents the correlation between two channels. CTD represents the time difference between two channels.

[0044] Figure 1 illustrates how humans spatially recognize audio signals and how the c...

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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 bitstream 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 bitstream 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 .

Description

technical field [0001] The invention relates to a method and / or device for encoding and / or decoding audio signals. Background of the invention [0002] The invention relates to encoding and / or decoding of spatial information of multi-channel audio signals. Recently, various encoding techniques and methods for digital audio signals have been developed, and various products associated therewith have been produced. [0003] However, when a multi-channel audio signal is downmixed into a form of a mono or stereo audio signal, there may be a problem of level loss of the audio signal. Especially the coded signal still exhibits the sound level loss phenomenon even after it has been coded by the core codec, because the coded signal has a limited size, eg 16 bits. This level loss phenomenon of the audio signal affects the output characteristics of the audio signal and causes deterioration of sound quality. Contents of the invention [0004] An object of the present invention conc...

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Application Information

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IPC IPC(8): G10L19/00G10L19/008G10L21/02H03M13/00
CPCG10L19/008G10L19/167G10L19/26
Inventor 房熙锡吴贤午金东秀林宰显郑亮源尹圣龙
Owner LG ELECTRONICS INC
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