Multichannel audio data encoding/decoding method and apparatus

Abstract

A multichannel audio data encoding and / or decoding method and apparatus are provided. The encoding method includes: encoding mono and / or stereo audio data; and encoding extended multichannel audio data other than the mono and / or stereo audio data. The decoding method includes: decoding mono and / or stereo audio data; examining whether or not there is extended multichannel audio data to be decoded other than the mono and / or stereo audio data; and if there is extended data to be decoded, decoding the extended multichannel audio data. According to the method and apparatus, with only one bitstream, mono, stereo, and multichannel can be provided according to a user environment. Also in multichannel audio, a fine grain scalability (FGS) function is provided according to the states of a user terminal and a network. Furthermore, enhancement of the performance of multichannel bit sliced arithmetic coding (BSAC), for example, a high sound quality, low complexity, and scalability, is enabled. In particular, a variety of requirements for MPEG standardization can be satisfied. Also, the method and apparatus can be employed in more lifelike digital multimedia broadcasting and mobile- and home-theater-based services.

Description

technical field [0001] The present invention relates to audio encoding and decoding, and more particularly, to multi-channel audio data encoding and decoding methods and devices. Background technique [0002] Since 2003, terrestrial digital multimedia broadcasting (DMB) has used the audio codec MPEG-4 bit slice arithmetic coding (BSAC). Although currently only stereo services are available, it is expected that multi-channel services will be included in the future. MPEG-4 BASC is supposed to increase compression efficiency and improve the functionality of techniques such as bandwidth-extended and spatial audio. [0003] In conventional BSAC multi-channel, the center, front left, front right, rear left and rear right channels are coded alternately in one layer. Figure 1 shows the structure of a traditional BASC multi-channel. The BSAC structure provides Fine Scalability (FGS) functionality. That is, all five channels are in one layer and data can be...

AI Technical Summary

Problems solved by technology

[0007] However, in the traditional BSAC multi-channel structure shown in Figure 1, mid-side (M / S) stereo cannot be used

This is because the M / S stereo function cannot be used when the number of channels is 2 or more in conventional encoding and decoding syntax

Therefore, the encoding efficiency decreases

In addition, since window switching and PNS should use the same side information for all channels, the coding efficiency is reduced

Also, since all 5 channels are interleaved, a memory 5 times larger than that of mono audio is required

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