Method and an apparatus for decoding an audio signal

• US 8,005,229 B2
• Filed: 03/16/2009
• Issued: 08/23/2011
• Est. Priority Date: 12/07/2006
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Oh, Hyen-O, Jung, Yang-Won
• Primary Examiner(s): Chin; Vivian
• Assistant Examiner(s): Kurr; Jason R
• Application Number:
  US12/405,164
• Publication Number:
  US 20090281814A1
• Time in Patent Office: 890 Days
• Field of Search: 700/94, 704/500, 704/504, 704/501, 381/22, 381/23, 381/2, 381/119, 381 17- 19, 369/1, 369/4, 386/54, 386/96
• US Class Current: 381/22
• 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: H04S 2420/01 Enhancing the perception of the sound image or of the spatial distribution using head related transfer functions [HRTF's] or equivalents thereof, e.g. interaural time difference [ITD] or interaural level difference [ILD]
• CPC Class Codes: H04S 2420/03 Application of parametric coding in stereophonic audio systems
• CPC Class Codes: H04S 3/008 in which the audio signals are in digital form, i.e. employing more than two discrete digital channels data reduction aspects thereof based on psychoacoustics G10L19/02
• CPC Class Codes: H04S 7/302 Electronic adaptation of stereophonic sound system to listener position or orientation H04S7/301 takes precedence

Abstract

A method for processing an audio signal, comprising: receiving a downmix signal, an object information, and a mix information; generating a downmix processing information using the object information and the mix information; processing the downmix signal using the downmix processing information; and, generating a multi-channel information using the object information and the mix information, wherein the number of channel of the downmix signal is equal to the number of channel of the processed downmix signal is disclosed.

Claims

1. A method of decoding an audio signal performed by an audio coding system, comprising:

receiving a downmix signal comprising at least one object signal and object information determined when the downmix signal is generated;

receiving mix information for controlling the at least one object signal;

generating downmix processing information using the object information and the mix information;

processing the downmix signal using the downmix processing information; and

generating multi-channel information using the object information and the mix information,

wherein;

a number of channels of the downmix signal is equal to a number of channels of the processed downmix signal;

a channel of the processed downmix signal comprising a combination of a first channel of the downmix signal multiplied by a first gain and a second channel of the downmix signal multiplied by a second gain in case that the downmix signal corresponds to a stereo signal;

the object information includes at least one of object level information and object correlation information; and

the multi-channel information includes at least one of channel level information and channel correlation information.

2. The method of claim 1, wherein the downmix processing information corresponds to information for controlling object panning if the number of channels of the downmix is at least two.

3. The method of claim 1, wherein the processing the downmix signal is performed by 2×

2 module in case that the downmix signal corresponds to stereo signal.

4. The method of claim 1, further comprising:

generating a multi-channel signal using the processed downmix signal and the multi-channel information.

5. A method of decoding an audio signal performed by an audio coding system, comprising:

receiving a downmix signal comprising at least one object signal and object information determined when the downmix signal is generated;

receiving mix information for controlling the at least one object signal;

decomposing the downmix signal into a subband signal;

generating downmix processing information using the object information and the mix information;

processing the subband signal using the downmix processing information; and

generating an output signal using the processed subband signal,

wherein;

a number of channels of the downmix signal is equal to a number of channels of the output signal, and the output signal corresponds to time domain signal;

a channel of the processed downmix signal comprising a combination of a first channel of the downmix signal multiplied by a first gain and a second channel of the downmix signal multiplied by a second gain in case that the downmix signal corresponds to a stereo signal; and

the object information includes at least one of object level information and object correlation information.

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

an information generating device configured to perform operations comprising;

receiving object information determined when a downmix signal is generated and mix information for controlling at least one object signal;

generating downmix processing information using the object information and the mix information; and

generating multi-channel information using the object information and the mix information; and

a downmix processing device configured to perform operations comprising;

receiving the downmix signal and the downmix processing information; and

processing the downmix signal using the downmix processing information,

wherein;

a number of channels of the downmix signal is equal to a number of channels of the processed downmix signal;

a channel of the processed downmix signal comprising a combination of a first channel of the downmix signal multiplied by a first gain and a second channel of the downmix signal multiplied by a second gain in case that the downmix signal corresponds to a stereo signal;

the object information includes at least one of object level information and object correlation information; and

the multi-channel information includes at least one of channel level information and channel correlation information.

7. The apparatus of claim 6, wherein the downmix processing information corresponds to information for controlling object panning if the number of channels of the downmix is at least two.

8. The apparatus of claim 6, wherein the processing the downmix signal is performed by a 2×

2 device component in case that the downmix signal corresponds to a stereo signal.

9. The apparatus of claim 6, further comprising:

a multi-channel decoder generating a multi-channel signal using the processed downmix signal and the multi-channel information.