Method For Decoding An Audio Signal

• US 20080235036A1
• Filed: 08/30/2006
• Published: 09/25/2008
• Est. Priority Date: 08/30/2005
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Oh, Hyeon O, Pang, Hee Suk, Lim, Jae Hyun, Jung, Yang Won, Kim, Dong Soo
• Granted Patent: US 7,788,107 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

Abstract

The invention relates to a method for decoding an audio signal, to allow an audio signal to be compressed and transferred more efficiently. The inventive method comprises steps of receiving an audio signal with spatial information signal, obtaining location information using the number of time slot and parameter of audio signal, establishing a multi-channel audio signal by applying spatial information signal to down-mix signal, and performing a multi-channel array for a multi-channel audio signal in response to the output channel.

Claims

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

receiving an audio signal including a spatial information signal and a downmix signal;

obtaining position information of a timeslot using a timeslot number and a parameter number included in the audio signal;

generating a multi-channel audio signal by applying the spatial information signal to the downmix signal according to the position information of the timeslot; and

arranging multi-channel audio signal correspondingly to an output channel.

2. The method of claim 1, wherein the position information of the timeslot is represented as a variable bit number.

3. The method of claim 2, wherein the position information includes an initial value and a difference value, wherein the initial value indicates the position information of the timeslot to which a first parameter is applied and wherein the difference value indicates the position information of the timeslot to which a second or subsequent parameter is applied.

4. The method of claim 3, wherein the initial value is represented as a variable bit number decided using at least one of the timeslot number and the parameter number.

5. The method of claim 3, wherein the difference value is represented as a variable bit number decided using at least one of the timeslot number, the parameter number and the position information of the timeslot to which a previous parameter is applied.

6. The method of claim 1, further comprising arranging downmix signal according to a preset method.

7. The method of claim 6, wherein the arranging downmix signal is performed on the downmix signal entering a signal converting unit upmixing two downmix signals into three signals.

8. The method of claim 6 or claim 7, wherein if a header is included in the spatial information signal, the downmix signal is arranged using audio signal arrangement information included in configuration information extracted from the header.

9. The method of any one of claim 1, claim 2 and claim 6, wherein information quantity required for mapping an ith audio signal or for arranging an ith downmix signal is an minimum integer equal to or greater than log₂[(the number of total audio signals or the number of total downmix signals)−

(a value of the ‘

i’

)+1].

12. The method of claim 1, wherein the arranging of the multi-channel audio signal further comprises arranging the audio signal correspondingly to a speaker.

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

an upmixing unit upmixing an audio signal into a multi-channel audio signal; and

a multi-channel arranging unit mapping the multi-channel audio signal to output channels according to a preset arrangement.

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

a core decoding unit decoding an encoded downmix signal;

an arranging unit arranging the decoded audio signal according to a preset arrangement; and

an upmixing unit upmixing the arranged audio signal into a multi-channel audio signal.