Method and apparatus for processing audio signal

• US 7,675,977 B2
• Filed: 10/04/2006
• Issued: 03/09/2010
• 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:
  US12/088,868
• Publication Number:
  US 20080253474A1
• Time in Patent Office: 1,252 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. A data structure for processing a signal includes a payload part having at least one of data coding information including pilot coding information per a frame and entropy coding information. The data structure includes data coding information having information for a data coding scheme and entropy coding information having information for an entropy coding scheme and a second data part having a reference value corresponding to a plurality of data, and a difference value generated using the reference value and the data.

Claims

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

obtaining, by a data coding apparatus, data coding identification information which identifies a data coding scheme from among at least a pilot coding scheme and a differential coding scheme, wherein the differential coding scheme comprises at least one of a frequency differential coding scheme and a time differential coding scheme; and

decoding data elements of a current group included in a current frame according to the data coding scheme identified by the data coding identification information, using a pilot reference value and one or more pilot difference values which are generated using the data elements and the pilot reference value,

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 time differential coding scheme comprises at least one of a forward time differential coding scheme and a backward time differential coding scheme.

3. The method of claim 1, further comprising:

obtaining entropy coding identification information; and

entropy-decoding the data elements using an entropy coding scheme indicated by the entropy coding identification information.

4. The method of claim 3, wherein decoding the data elements further comprises decoding the entropy-decoded data elements.

5. The method of claim 3, wherein:

the entropy decoding scheme comprises at least one of a one-dimensional coding scheme and a multi-dimensional coding scheme, and

the multi-dimensional coding scheme comprises at least one of a frequency pair coding scheme and a time pair coding scheme.

6. The method of claim 1, further comprising decoding an audio signal using the data elements as parameters.

7. 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.

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

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

a decoding part configured to;

obtain data coding identification information which identifies a data coding scheme from among at least a pilot coding scheme and a differential coding scheme, wherein the differential coding scheme comprises at least one of a frequency differential coding scheme and a time differential coding scheme; and

decode data elements of a current group included in a current frame according to the data coding scheme identified by the data coding identification information, using a pilot reference value and one or more pilot difference values which are generated using the data elements and the pilot reference value,

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.

10. The apparatus of claim 9, wherein the time differential coding scheme comprises at least one of a forward time differential coding scheme and a backward time differential coding scheme.

11. The apparatus of claim 9, further comprising an entropy-decoding part configured to:

obtain entropy coding identification information; and

entropy-decode the data elements using an entropy coding scheme indicated by the entropy coding identification information.

12. The apparatus of claim 11, wherein decoding the data elements further comprises decoding the entropy-decoded data elements.

13. The apparatus of claim 11, wherein:

the entropy decoding scheme comprises at least one of a one-dimensional coding scheme and a multi-dimensional coding scheme, and

the multi-dimensional coding scheme comprises at least one of a frequency pair coding scheme and a time pair coding scheme.

14. The apparatus of claim 9, further comprising a reconstructing part configured to decode an audio signal using the data elements as parameters.

15. The apparatus of claim 9, wherein the pilot reference value represents and intermediate, average, or most frequently used value associated with the data elements of the current group.

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

an audio coding apparatus configured to;

obtain data coding identification information which identifies a data coding scheme from among at least a pilot coding scheme and a differential coding scheme, wherein the differential coding scheme comprises at least one of a frequency differential coding scheme and a time differential coding scheme; and

decode data elements of a current group included in a current frame according to the data coding scheme identified by the data coding identification information, using a pilot reference value and one or more pilot difference values which are generated using the data elements and the pilot reference value,

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.

17. The system of claim 16, wherein the time differential coding scheme comprises at least one of a forward time differential coding scheme and a backward time differential coding scheme.

18. The system of claim 16, wherein the audio coding apparatus is further configured to:

obtain entropy coding identification information; and

entropy-decode the data elements using an entropy coding scheme indicated by the entropy coding identification information.

19. The system of claim 18, wherein decoding the data elements further comprises decoding the entropy-decoded data elements.

20. The system of claim 18, wherein:

the entropy decoding scheme comprises at least one of a one-dimensional coding scheme and a multi-dimensional coding scheme, and

the multi-dimensional coding scheme comprises at least one of a frequency pair coding scheme and a time pair coding scheme.