Method and apparatus for signal processing and encoding and decoding method, and apparatus therefor

• US 7,646,319 B2
• Filed: 10/04/2006
• Issued: 01/12/2010
• 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, Lim, Jae Hyun, Jung, Yang Won, Kim, Dong Soo, Kim, Hyo Jin, Oh, Hyen O
• Primary Examiner(s): WILLIAMS, HOWARD L
• Application Number:
  US12/089,105
• Publication Number:
  US 20080258943A1
• Time in Patent Office: 1,196 Days
• Field of Search: 341/50, 341/51, 341/67, 341/76, 704/201, 704/205, 704/211, 704/212, 704/500, 700/94
• US Class Current: 341/76
• 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 19/20 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: 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

An apparatus for processing a signal and method thereof are disclosed. Data coding and entropy coding are performed with interconnection, and grouping is used to enhance coding efficiency. The present invention includes the steps of obtaining data corresponding to a plurality of data coding schemes and deciding an entropy table for at least one of a pilot reference value and a pilot difference value included in the data using an entropy table identifier unique to the data coding scheme and entropy-decoding at least one of the pilot reference value and the pilot difference value using the entropy table.

Claims

1. A method for processing a signal, the method comprising:

determining, by an audio coding apparatus, an entropy table identifier associated with a particular data coding scheme used to encode a signal;

obtaining a pilot reference value and one or more pilot difference values from the signal;

selecting, from among several entropy tables, a particular entropy table for use with the pilot reference value or the pilot difference values, based on the entropy table identifier; and

entropy-decoding the pilot reference value or the pilot difference values using the selected entropy table,

wherein;

the pilot reference value is dependent on each data element of a current group included in a current frame, 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 entropy table identifier is associated with one of a pilot coding scheme, a frequency differential coding scheme and a time differential coding scheme.

3. The method of claim 1, wherein the entropy table identifier is associated with the pilot reference value and the pilot difference values.

4. The method of claim 1, wherein the selected entropy table comprises one of a pilot table, a frequency differential table and a time differential table.

5. The method of claim 1, wherein the selected entropy table is used to entropy-decode the pilot reference value, and comprises a frequency differential table.

6. The method of claim 5, wherein the pilot reference value is entropy-decoded by one-dimensional entropy coding scheme.

7. The method of claim 1, wherein the entropy-decoding is performed according to entropy coding scheme including at least one of a one-dimensional entropy coding scheme and a multi-dimensional entropy coding scheme.

8. The method of claim 7, wherein the multi-dimensional entropy coding scheme includes at least one of a frequency pair coding scheme and a time pair coding scheme.

9. 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.

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

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

a value obtaining part configured to obtain a pilot reference value and one or more pilot difference values from the signal; and

an entropy decoding part configured to;

determine an entropy table identifier associated with a particular data coding scheme used to encode a signal,

select, from among several entropy tables, a particular entropy table for use with the pilot reference value or the pilot difference values, based on the entropy table identifier, and

entropy-decode the pilot reference value or the pilot difference values using the selected entropy table,

wherein;

the pilot reference value is dependent on each data element of a current group included in a current frame, 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.

12. The apparatus of claim 11, wherein the entropy table identifier is associated with one of a pilot coding scheme, a frequency differential coding scheme and a time differential coding scheme.

13. The apparatus of claim 11, wherein the entropy table identifier is associated with the pilot reference value and the pilot difference values.

14. The apparatus of claim 11, wherein the selected entropy table comprises one of a pilot table, a frequency differential table and a time differential table.

15. The apparatus of claim 11, wherein the selected entropy table is used to entropy-decode the pilot reference value, and comprises a frequency differential table.

16. The apparatus of claim 15, wherein the pilot reference value is entropy-decoded by one-dimensional entropy coding scheme.

17. The apparatus of claim 11, wherein the entropy-decoding is performed according to entropy coding scheme including at least one of a one-dimensional entropy coding scheme and a multi-dimensional entropy coding scheme.

18. The apparatus of claim 17, wherein the multi-dimensional entropy coding scheme includes at least one of a frequency pair coding scheme and a time pair coding scheme.

19. The apparatus of claim 11, further comprising a bitstream multiplexing part configured to reconstruct an audio signal using the data elements as parameters.

20. A computer storage medium encoded with a computer program, the program comprising instructions that when executed by an audio coding apparatus cause the audio coding apparatus to perform operations comprising:

determining an entropy table identifier associated with a particular data coding scheme used to encode a signal;

obtaining a pilot reference value and one or more pilot difference values from the signal;

selecting, from among several entropy tables, a particular entropy table for use with the pilot reference value or the pilot difference values, based on the entropy table identifier; and

entropy-decoding the pilot reference value or the pilot difference values using the selected entropy table,

wherein;

the pilot reference value is dependent on each data element of a current group included in a current frame, 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.