Method and apparatus for signal processing, encoding, and decoding

• US 7,680,194 B2
• Filed: 10/04/2006
• Issued: 03/16/2010
• Est. Priority Date: 10/05/2005
• 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, Kim, Hyo Jin, Jung, Yang-Won
• Primary Examiner(s): Payne; David C
• Assistant Examiner(s): DSOUZA, JOSEPH FRANCIS A
• Application Number:
  US12/088,865
• Publication Number:
  US 20080253441A1
• Time in Patent Office: 1,259 Days
• Field of Search: 375/295, 386/112
• US Class Current: 375/242
• CPC Class Codes: G10L 19/0017 Lossless audio signal coding; Perfect reconstruction of coded audio signal by transmission of coding error G10L19/24 takes precedence
• 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 19/04 using predictive techniques
• 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: G10L 19/18 Vocoders using multiple modes
• CPC Class Codes: G10L 19/20 using sound class specific coding, hybrid encoders or object based coding
• CPC Class Codes: G10L 19/22 Mode decision, i.e. based on audio signal content versus external parameters
• CPC Class Codes: H03M 7/30 Compression speech analysis-synthesis for redundancy reduction G10L19/00; for image communication H04N; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
• CPC Class Codes: H03M 7/40 Conversion to or from variable length codes, e.g. Shannon-Fano code, Huffman code, Morse code
• CPC Class Codes: H03M 7/42 using table look-up for the coding or decoding process, e.g. using read-only memory H03M7/4006 takes precedence
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04N 21/235 Processing of additional data, e.g. scrambling of additional data or processing content descriptors
• CPC Class Codes: H04N 21/435 Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream
• CPC Class Codes: H04S 1/007 in which the audio signals are in digital form data reduction aspects thereof based on psychoacoustics G10L19/02

Abstract

Apparatus and methods for processing a signal are disclosed. Data coding and entropy coding are performed with interconnection, and grouping is used to enhance coding efficiency. The subject matter includes a payload part having at least one of data coding information including pilot coding information per a frame and entropy coding information and a header part having main configuration information for the payload part.

Claims

1. A method for processing a signal using pilot based coding (PBC), the method comprising:

obtaining, by an audio coding apparatus and using a pilot based coding (PBC) scheme, a first partial parameter using a pilot reference value and one or more pilot difference values, the pilot reference value corresponding to data elements of a current group included in a current frame, and the one or more pilot difference values corresponding to the pilot reference value and the data elements; and

defining a whole parameter using the first partial parameter and at least a second partial parameter,

wherein;

the pilot reference value is dependent on each of the data elements of the current group, and is not dependent on the data elements of an other frame,

a quantity of the pilot difference values is equal to a quantity of the data elements of the current group,

the pilot reference value is a single value which applies to all of the data elements of the current group, and

each pilot difference value corresponds to each data element of the current group.

2. The method of claim 1, wherein:

the first partial parameter comprises bits which define a first part of the whole parameter, and

the second partial parameter comprises bits which define a second part of the whole parameter.

3. The method of claim 2, wherein the second partial parameter comprises a least significant bit of the whole parameter.

4. The method of claim 1, further comprising reconstructing an audio signal using the whole parameter.

5. The method of claim 4, wherein the whole parameter represents a channel level difference (CLD) parameter, an interchannel coherence (ICC) parameter, a channel prediction coefficient (CPC) parameter, or an arbitrary downmix gain (ADG) parameter.

6. The method of claim 5, further comprising:

when the whole parameter represents a CPC parameter, determining that a quantization scale of the whole parameter is not coarse, and

obtaining the second partial parameter based on determining that the quantization scale of the whole parameter is not coarse.

7. The method of claim 6, wherein defining the whole parameter further comprises twice multiplying the first partial parameter and adding a multiplication result to the second partial parameter.

8. The method of claim 1, wherein the pilot reference value represents and intermediate, average, or most frequently used value associated with the data elements of the current group.

9. The method of claim 1, wherein the audio coding apparatus comprises a processor.

10. A method of processing a signal, comprising:

to obtaining, by an audio coding apparatus, a first partial parameter using a reference value corresponding to the first partial parameter and a difference value corresponding to the reference value;

deciding a parameter using the first partial parameter and a second partial parameter,

wherein the second partial parameter is obtained if a quantization scale of the parameter is not coarse, deciding the parameter including;

twice multiplying the first partial parameter; and

adding a multiplication result to the second partial parameter, wherein the parameter is spatial information comprising at least one selected from the group consisting of channel level difference (CLD), interchannel coherence (ICC), channel prediction coefficient (CPC) and arbitrary downmix gain (ADG); and

reconstructing an audio signal using the decided parameter.

11. An apparatus for processing a signal, the apparatus comprising:

a decoding part configured to;

obtain a first partial parameter using a reference value corresponding to the first partial parameter and a difference value corresponding to the reference value;

decide a parameter using the first partial parameter and a second partial parameter,

wherein the second partial parameter is obtained if a quantization scale of the parameter is not coarse, deciding the parameter includes;

twice multiplying the first partial parameter; and

adding a multiplication result to the second partial parameter, wherein the parameter is spatial information comprising at least one selected from the group consisting of channel level difference (CLD), interchannel coherence (ICC), channel prediction coefficient (CPC) and arbitrary downmix gain (ADG); and

a reconstructing part configured to reconstruct an audio signal using the decided parameter.

12. A system for processing a signal, the system comprising:

a decoding apparatus configured to;

obtain a first partial parameter using a reference value corresponding to the first partial parameter and a difference value corresponding to the reference value;

decide a parameter using the first partial parameter and a second partial parameter,

wherein the second partial parameter is obtained if a quantization scale of the parameter is not coarse, deciding the parameter includes;

twice multiplying the first partial parameter; and

adding a multiplication result to the second partial parameter, wherein the parameter is spatial information comprising at least one selected from the group consisting of channel level difference (CLD), interchannel coherence (ICC), channel prediction coefficient (CPC) and arbitrary downmix gain (ADG); and

a reconstructing part configured to reconstruct an audio signal using the decided parameter.

13. An audio coding apparatus for processing a signal using pilot based coding (PBC), the apparatus comprising:

a decoding part configured to;

obtain, using a pilot based coding (PBC) scheme, a first partial parameter using a pilot reference value and one or more pilot difference values, the pilot reference value corresponding to data elements of a current group included in current frame, and the one or more pilot difference values corresponding to the pilot reference value and the data elements, and

define a whole parameter using the first partial parameter and at least a second partial parameter,

wherein;

the pilot reference value is dependent on each of the data elements of the current group, and is not dependent on the data elements of an other frame,

a quantity of the pilot difference values is equal to a quantity of the data elements of the current group,

the pilot reference value is a single value which applies to all of the data elements of the current group, and

each pilot difference value corresponds to each data element of the current group.

14. The apparatus of claim 13, wherein:

the first partial parameter comprises bits which define a first part of the whole parameter, and

the second partial parameter comprises bits which define a second part of the whole parameter.

15. The apparatus of claim 14, wherein the second partial parameter comprises a least significant bit of the whole parameter.

16. The apparatus of claim 13, further comprising a reconstructing part configured to reconstruct an audio signal using the whole parameter.

17. The apparatus of claim 16, wherein the whole parameter represents a channel level difference (CLD) parameter, an interchannel coherence (ICC) parameter, a channel prediction coefficient (CPC) parameter, or an arbitrary downmix gain (ADG) parameter.

18. The apparatus of claim 17, wherein the decoding part is further configured to:

when the whole parameter represents a CPC parameter, determine that a quantization scale of the whole parameter is not coarse, and

obtain the second partial parameter based on determining that the quantization scale of the whole parameter is not coarse.

19. The apparatus of claim 18, wherein defining the whole parameter further comprises twice multiplying the first partial parameter and adding a multiplication result to the second partial parameter.

20. The apparatus of claim 13, wherein the pilot reference value represents and intermediate, average, or most frequently used value associated with the data elements of the current group.