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

• US 7,663,513 B2
• Filed: 10/09/2006
• Issued: 02/16/2010
• 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): JEANGLAUDE, JEAN BRUNER
• Application Number:
  US12/088,962
• Publication Number:
  US 20090219182A1
• Time in Patent Office: 1,226 Days
• Field of Search: 341/50, 341/51, 341/79, 341/60, 341/67, 348/458, 386/96, 707/200, 375/240, 704/220, 710/68, 711/112, 382/253
• US Class Current: 341/67
• 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

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 index information and data and entropy-decoding the index information and identifying an entropy table corresponding to the entropy-decoded index information and entropy-decoding the data using the identified entropy table.

Claims

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

receiving, by an audio coding apparatus, an encoded entropy table index and one or more pilot difference values;

entropy-decoding the encoded entropy table index;

identifying, from among multiple entropy tables used for decoding the pilot difference values, a particular entropy table using the entropy table index;

entropy-decoding the pilot difference values using the particular entropy table; and

obtaining data elements using a pilot reference value and the entropy-decoded pilot difference values,

wherein the entropy table index is entropy decoded using an entropy table which is reserved exclusively for entropy table indexes.

2. The method of claim 1, wherein the data elements comprise a parameter and wherein the method further comprises reconstructing an audio signal using the parameter.

3. The method of claim 1, wherein the entropy table index comprises information for a plurality of indexes characterized by probability of occurrence.

4. The method of claim 1, wherein the pilot reference value represents an average value of the data elements, an intermediate value of the data elements, a most frequently used value of the data elements, or a default value.

5. The method of claim 1, wherein the multiple entropy tables are classified according to data types.

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

7. The method of claim 1, wherein the pilot difference values are entropy-decoded in two dimensions using the entropy table.

8. The method of claim 1, wherein the entropy table index differs in accordance with combining data coding scheme and entropy coding scheme.

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

obtaining, by an audio coding apparatus, one or more pilot difference values using data elements and a pilot reference value;

entropy-encoding the pilot difference values using a particular entropy table;

generating an entropy table index identifying the particular entropy table from among multiple entropy tables used for encoding the pilot difference values;

entropy-encoding the entropy table index; and

transferring the entropy-encoded entropy table index,

wherein the entropy table index is entropy-encoded using an entropy table which is reserved exclusively for entropy table indexes.

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

11. The method of claim 9, wherein the pilot reference value represents an average value of the data elements, an intermediate value of the data elements, a most frequently used value of the data elements, or a default value.

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

a data obtaining part obtaining one or more pilot difference values using data elements and a pilot reference value;

an encoding part entropy-encoding pilot difference values using a particular entropy table;

an information generating part generating the particular table index identifying the particular entropy table from among multiple entropy tables used for encoding the pilot difference values;

an index encoding part entropy-encoding the entropy table index; and

an outputting part transferring the entropy-encoded entropy table index,

wherein the entropy table index is entropy-encoded using an entropy table which is reserved exclusively for entropy table indexes.

13. The apparatus of claim 12, wherein the pilot reference value represents an average value of the data elements, an intermediate value of the data elements, a most frequently used value of the data elements, or a default value.

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

an inputting part receiving an encoded entropy table index and one or more pilot difference values;

a first decoding part entropy-decoding the encoded entropy table index;

an identifying part identifying, from among multiple entropy tables used for decoding the pilot difference values, a particular entropy table using the entropy table index;

a second decoding part entropy-decoding the pilot difference values using the particular entropy table;

a data obtaining part obtaining data elements using a pilot reference value and the decoded pilot difference values,

wherein the entropy table index is entropy-decoded using an entropy table which is reserved exclusively for entropy table indexes.

15. The apparatus of claim 14, wherein the entropy table index comprises information for a plurality of indexes characterized by probability of occurrence.

16. The apparatus of claim 14, wherein the elements comprise a parameter and wherein the apparatus further comprises a plural-channel generation part reconstructing audio signal using the parameter.

17. The apparatus of claim 14, wherein the multiple entropy tables are classified according to data types.

18. The apparatus of claim 14, wherein the entropy table is used to entropy-decode the pilot difference values in two dimensions.

19. The apparatus of claim 14, wherein the entropy table index differs in accordance with combining data coding scheme and entropy coding scheme.

20. The apparatus of claim 14, wherein the pilot reference value represents an average value of the data elements, an intermediate value of the data elements, a most frequently used value of the data elements, or a default value.