Slot position coding of residual signals of spatial audio coding application

• US 20070094036A1
• Filed: 08/30/2006
• Published: 04/26/2007
• Est. Priority Date: 08/30/2005
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Pang, Hee, Jung, Yang, Kim, Dong, Lim, Jae, Oh, Hyen
• Granted Patent: US 7,765,104 B2
• Time in Patent Office: Days
• US Class Current: 704/503
• 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
• CPC Class Codes: H04R 2499/11 Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's
• CPC Class Codes: H04S 1/007 in which the audio signals are in digital form data reduction aspects thereof based on psychoacoustics G10L19/02
• CPC Class Codes: H04S 2420/03 Application of parametric coding in stereophonic audio systems
• CPC Class Codes: H04S 3/002 Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution control circuits for electronic adaptation of the sound field H04S7/30

Abstract

Spatial information associated with an audio signal is encoded into a bitstream, which can be transmitted to a decoder or recorded to a storage media. The bitstream can include different syntax related to time, frequency and spatial domains. In some embodiments, the bitstream includes one or more data structures (e.g., frames) that contain ordered sets of slots for which parameters can be applied. The data structures can be fixed or variable. The data structure can include position information that can be used by a decoder to identify the correct slot for which a given parameter set is applied. The slot position information can be encoded with either a fixed number of bits or a variable number of bits based on the data structure type.

Claims

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

generating a parameter set corresponding to first or second information of an audio signal;

generating a residual signal corresponding to a range of the first or second information; and

inserting the parameter set and the residual signal in a bitstream representing the audio signal,

wherein the first or second information is represented by a variable number of bits.

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

receiving a bit stream representing an audio signal, the bitstream including a parameter set corresponding to first or second information of the audio signal;

receiving a residual signal corresponding to a range of the first or second information; and

decoding the audio signal based on the parameter set and the residual signal,

wherein the first or second information is represented by a variable number of bits.

3. The method of claim 2, wherein the first information is position information of a time domain or a time slot to which the parameter set is applied, and the second information is position information of a frequency domain, a sub-band or a parameter band to which the parameter set is applied.

4. The method of claim 3, wherein the first or second information indicates a fixed position or a variable position.

5. The method of claim 4, wherein the first information is represented by a variable number of bits, the variable number of bits being determined by using number information of the time domain or the time slot, and the second information is represented by a variable number of bits, the variable number of bits being determined by using number information of the frequency domain, the sub-band or the parameter band.

6. The method of claim 5, wherein when the number information is equal to or greater than 2ˆ

(n−

1) and less than 2ˆ

(n), the variable number of bits is decided as n bits.

7. The method of claim 5, wherein, when the number information is greater than 2ˆ

(n−

1) and equal to or less than 2ˆ

(n), the variable number of bits is decided as n bits.

8. The method of claim 2, further comprising:

applying the parameter set and the residual signal to a channel converting module, the channel converting module mapping from n to m channels, where n is less than m.

9. The method of claim 8, the applying of the parameter set further comprising:

updating inter-channel correlation information of the audio signal to which the residual signal is applied; and

applying the inter-channel correlation information to the decoding.

10. The method of claim 2, wherein the first information is represented as an initial value and a difference value, wherein the initial value indicates the position information to which a first parameter set is applied and the difference value indicates the position information to which a second or higher parameter set is applied.

11. The method of claim 2, wherein, if the second information is position information of a parameter band, a plurality of the second information corresponding to the second parameter set, is represented as a combination using a formula as follows:

12. The method of claim 2, wherein if the first or second information exist plurally, a plurality of the first or second information are divided as a group and are represented per the group.

13. The method of claim 12, wherein if a number of the first or second information is (kN+L), the group is generated by binding N of the first or second information together and is represented by M bits, and a last group is generated by binding L of the first or second information together and is represented by P bits.

14. An apparatus for encoding an audio signal, comprising an encoder configured for:

generating a parameter set corresponding to first or second information of an audio signal;

generating a residual signal corresponding to a range of the first or second information; and

inserting the parameter set and the residual signal in a bitstream representing the audio signal,

wherein the first or second information is represented by a variable number of bits.

15. An apparatus for decoding an audio signal, comprising a decoder configured for:

receiving a bit stream representing an audio signal, the bitstream including a parameter set corresponding to first or second information of the audio signal;

receiving a residual signal corresponding to a range of the first or second information; and

decoding the audio signal based on the parameter set and the residual signal,

wherein the first or second information is represented by a variable number of bits.

16. A data structure for inclusion in a bitstream of an audio signal, the data structure comprising:

a first field including first or second information of an audio signal;

a second field including a parameter set corresponding to the first or second information; and

a residual signal corresponding to a range of the first or second information,

wherein the first or second information is represented by a variable number of bits.

17. A computer-readable medium having instructions stored thereon, which, when executed by a processor, causes the processor to perform the operations of:

receiving a bit stream representing an audio signal, the bitstream including a parameter set corresponding to first or second information of the audio signal;

receiving a residual signal corresponding to a range of the first or second information; and

decoding the audio signal based on the parameter set and the residual signal,

wherein the first or second information is represented by a variable number of bits.

18. A system, comprising:

a processor;

a computer-readable medium coupled to the processor and having instructions stored thereon, which, when executed by the processor, causes the processor to perform the operations of;

receiving a bit stream representing an audio signal, the bitstream including a parameter set corresponding to first or second information of the audio signal;

receiving a residual signal corresponding to a range of the first or second information; and

decoding the audio signal based on the parameter set and the residual signal,

wherein the first or second information is represented by a variable number of bits.

19. A system, comprising:

means for receiving a bit stream representing an audio signal, the bitstream including a parameter set corresponding to first or second information of the audio signal;

means for receiving a residual signal corresponding to a range of the first or second information; and

means for decoding the audio signal based on the parameter set and the residual signal,

wherein the first or second information is represented by a variable number of bits.