METHOD AND APPARATUS FOR ENCODING AND DECODING AN AUDIO SIGNAL

• US 20090216542A1
• Filed: 06/30/2006
• Published: 08/27/2009
• Est. Priority Date: 06/30/2005
• 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 8,185,403 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 19/167 Audio streaming, i.e. formatting and decoding of an encoded audio signal representation into a data stream for transmission or storage purposes

Abstract

A method and apparatus for encoding and decoding an audio signal are provided. The present invention includes receiving an audio signal including a downmix signal and a spatial information signal, if a header is included in the spatial information signal, extracting configuration information from the header, extracting spatial information included in the spatial information signal, and converting the downmix signal to a multi-channel signal using the configuration information and the spatial information. Accordingly, the header can be selectively included in the spatial information signal, thereby if the header is plurally included in the spatial information signal, it is able to decode spatial information in case of reproducing the audio signal from a random point.

Claims

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

receiving an audio signal and header identification information indicating whether a header is included in an ancillary signal, the audio signal including a downmix signal and the ancillary signal;

extracting configuration information from the header when the header is included in the ancillary signal according to the header identification information;

decoding the audio signal based on the configuration information,

wherein the configuration information includes at least one of time align information and position information of a time slot,

the time align information indicates a time delay between the ancillary signal and the downmix signal when the ancillary signal being embedded in the downmix signal is transported.

2. The method of claim 1,

wherein the ancillary signal includes at least one header in each a preset temporal or spatial interval.

3. The method of claim 1,

wherein the ancillary signal indicates spatial information signal.

4. The method of claim 3, further comprising:

applying a parameter included in the spatial information signal to a corresponding time slot using position information of the corresponding time slot included in the spatial information signal.

5. The method of claim 3,

wherein the audio signal includes signal identification information indicating whether the spatial information signal is combined with the downmix signal.

6. The method of claim 1, further comprising:

identifying a start position of a frame of the ancillary signal using the time align information.

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

receiving an audio signal and header identification information indicating whether a header is included in an ancillary signal the audio signal including a downmix signal and the ancillary signal;

when a first header is not included in the ancillary signal according to the header identification information, decoding the audio signal based on the configuration information of a second header, the second header being transported before the first header,

wherein the configuration information includes at least one of time align information and position information of a time slot,

the time align information indicates a time delay between the ancillary signal and the downmix signal when the ancillary signal being embedded in the downmix signal is transported.

8. An apparatus of decoding an audio signal comprising:

a receiving unit receiving an audio signal and header identification information indicating whether a header is included in an ancillary signal, the audio signal including a downmix signal and the ancillary signal;

an extracting unit extracting configuration information from the header when the header is included in the ancillary signal according to the header identification information;

a multi-channel generating unit decoding the audio signal based on the configuration information,

wherein the configuration information includes at least one of time align information and position information of a time slot,

the time align information indicates a time delay between the ancillary signal and the downmix signal when the ancillary signal being embedded in the downmix signal is transported.