Method of Encoding and Decoding an Audio Signal

• US 20090055196A1
• Filed: 05/26/2006
• Published: 02/26/2009
• Est. Priority Date: 05/26/2005
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Pang, Hee Suk, Oh, Hyen-O, Lim, Jae Hyun, Kim, Dong Soo, Jung, Yang-Won
• Granted Patent: US 8,090,586 B2
• Time in Patent Office: Days
• US Class Current: 704/500
• CPC Class Codes: G10L 19/008 Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
• CPC Class Codes: G10L 19/018 Audio watermarking, i.e. embedding inaudible data in the audio signal
• CPC Class Codes: G10L 19/167 Audio streaming, i.e. formatting and decoding of an encoded audio signal representation into a data stream for transmission or storage purposes
• CPC Class Codes: H04H 20/89 using three or more audio channels, e.g. triphonic or quadraphonic

Abstract

An apparatus for encoding and decoding an audio signal and method thereof are disclosed, by which compatibility with a player of a general mono or stereo audio signal can be provided in coding an audio signal and by which spatial information for a multi-channel audio signal can be stored or transmitted without a presence of an auxiliary data area. The present invention includes extracting side information embedded in non-recognizable component of audio signal components and decoding the audio signal using the extracted side information.

Claims

1. A method of decoding an audio signal, comprising:

extracting side information embedded in non-recognizable components of audio signal; and

decoding the audio signal using the extracted side information.

2. The method of claim 1, further comprising the step of extracting information with a predetermined length from a header area for the side information.

3. The method of claim 2, further comprising the step of applying a reverse-whitening scheme to header area information except a sync word in the extracted header area information.

4. The method of claim 3, further comprising the step of obtaining length information of the header area using the header area information having the reverse-whitening scheme applied thereto.

5. The method of claim 1, further comprising the step of extracting an insertion bit length of the embedded side information.

6. The method of claim 5, wherein the insertion bit length has a fixed value within a block in which the side information is embedded.

7. The method of claim 1, further comprising the step of applying a reverse-whitening scheme to the side information.

8. The method of claim 1, further comprising:

extracting at least one error detection code or at least one error correction code embedded in the audio signal; and

deciding a presence or non-presence of a damage of the side information using the extracted at least one error detection code or the extracted at least one error correction code.

9. The method of claim 1, wherein the audio signal includes a downmix signal.

10. The method of claim 1, wherein the side information includes spatial information for the audio signal.

11. An apparatus for decoding an audio signal, comprising:

an embedded signal decoding unit decoding the audio signal and extracting side information embedded in non-recognizable components of the audio signal; and

a multi-channel generating unit generating multi-channel audio signal using the decoded audio signal and the decoded side information.

12. The apparatus of claim 11, wherein the embedded signal decoding unit further comprises information extracting unit extracting header area information with a predetermined length from a header area for the side information.

13. The apparatus of claim 12, wherein the information extracting unit further comprises reverse-whitening applying unit applying a reverse-whitening scheme to header area information except a sync word in the extracted header area information.

14. The apparatus of claim 13, further comprising:

a length information obtaining unit obtaining length information of the header area using the header area information having the reverse-whitening scheme applied thereto.

15. The apparatus of claim 11, further comprising:

an insertion bit length information extracting unit extracting an insertion bit length of the embedded side information.

16. The apparatus of claim 15, wherein the insertion bit length has a fixed value within a block in which the side information is embedded.

17. The apparatus of claim 11, further comprising:

an error detection unit extracting at least one error detection code or at least one error correction code embedded in the audio signal, and deciding a presence or non-presence of a damage of the side information using the extracted at least one error detection code or the extracted at least one error correction code.

18. A method of encoding an audio signal, comprising:

generating side information necessary for decoding the audio signal; and

embedding the generated side information in non-recognizable components of the audio signal.

19. An apparatus for encoding an audio signal, comprising:

an audio signal generating unit generating downmixed audio signal from multi-channel audio signal;

a side information generating unit generating side information from the multi-channel audio signal;

a side information encoding unit encoding the generated side information; and

an embedding unit embedding the side information by reshaping into the downmixed audio signal.

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23. (canceled)