Method of Encoding and Decoding an Audio Signal

• US 20090119110A1
• Filed: 05/26/2006
• Published: 05/07/2009
• 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 8,214,220 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 the audio signal by an insertion frame unit wherein an insertion frame length is defined per a frame; and

decoding the audio signal using the side information.

2. The method of claim 1, further comprising extracting information for the insertion frame length from a header of an insertion frame.

3. The method of claim 1, further comprising extracting discriminating information for a presence or non-presence of a decoding frame header for the side information within an insertion frame.

4. The method of claim 3, further comprising extracting discriminating information indicating whether position information of the audio signal to which the side information is applied exists within the decoding frame header.

5. The method of claim 4, further comprising extracting the position information of the audio signal according to the discriminating information.

6. The method of claim 1, wherein the insertion frame length is a positive integer and is obtained by multiplying or dividing a decoding frame length of the side information with N, wherein N is a positive integer.

7. The method of claim 1, wherein the insertion frame length corresponds to a fixed length.

8. The method of claim 1, wherein the audio signal includes a downmix signal for a multi-channel signal.

9. The method of claim 1, wherein the side information includes spatial information for a multi-channel signal.

13. The method of claim 1, wherein the insertion frame length is predetermined.

14. The method of claim 13, wherein the insertion frame length corresponds to an integer multiplication of a decoding frame length of the side information.

15. The method of claim 13, wherein the insertion frame length corresponds to a fixed length.

10. (canceled)

11. (canceled)

12. (canceled)

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

an embedded signal decoding unit decoding the audio signal and extracting side information embedded in the audio signal by an insertion frame;

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

wherein length of the insertion frame is defined per a frame.

17. The apparatus of claim 16, further comprising:

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

18. The apparatus of claim 16, further comprising a discriminating information extracting unit extracting discriminating information for a presence or non-presence of a decoding frame header for the side information within an insertion frame from the embedded side information.

19. The apparatus of claim 18, wherein the discriminating information extracting unit further comprises discriminating information indicating whether position information of the audio signal to which the side information is applied exists within the decoding frame header.

20. The apparatus of claim 16, wherein the insertion frame length is a positive integer and is obtained by multiplying or dividing a decoding frame length of the side information with N, wherein N is a positive integer.

21. The apparatus of claim 16, wherein the insertion frame length is predetermined.

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

generating side information necessary for decoding an audio signal; and

embedding the generated side information in the audio signal by an insertion frame unit, wherein an insertion frame length is defined per a frame.

23. 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 in the audio signal by an insertion frame length defined per a frame.

24. (canceled)

25. (canceled)