Signal processing using pilot based coding

• US 7,774,199 B2
• Filed: 10/09/2006
• Issued: 08/10/2010
• 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): Opsasnick; Michael N
• Application Number:
  US12/089,091
• Publication Number:
  US 20080262852A1
• Time in Patent Office: 1,401 Days
• Field of Search: 704/206, 704500-504
• US Class Current: 704/206
• 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 a difference value and index information and entropy-decoding the index information and identifying an entropy table corresponding to the entropy-decoded index information and entropy-decoding the difference value using the identified entropy table and obtaining data using a reference value corresponding to a plurality of data and the decoded difference value.

Claims

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

generating, 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 among multiple entropy tables used for decoding the pilot difference values;

generating entropy table index identifying the particular entropy table;

obtaining a codeword corresponding to an entropy-encoded entropy table index by entropy-encoding the entropy table index, wherein variable bits are allocated to the codeword based on frequency for use; and

transferring the codeword and the entropy-encoded pilot difference value,

wherein;

the entropy table index comprises a largest absolute value (LAV) among multiple indexes included in the particular entropy table,

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

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

each pilot difference value corresponds to each data element.

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

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

a encoding part entropy-encoding the pilot difference values using a particular entropy table among multiple entropy tables used for decoding the pilot difference values;

an information generating part generating entropy table index identifying the particular entropy table;

an index encoding part obtaining a codeword corresponding to an entropy-encoded entropy table index by entropy-encoding the entropy table index, wherein variable bits are allocated to the codeword based on frequency for use; and

an outputting part transferring the codeword and the entropy-encoded pilot difference values,

wherein;

the entropy table index comprises a largest absolute value (LAV) among multiple indexes included in the particular entropy table,

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

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

each pilot difference value corresponds to each data element.

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

an inputting part receiving one or more difference values and a codeword corresponding to an entropy-encoded entropy table index, wherein variable bits are allocated to the codeword based on frequency for use;

an index decoding part obtaining an entropy-decoded entropy table index by entropy-decoding the codeword;

a identifying part identifying, from among multiple table used for decoding the pilot difference values, a particular entropy table the entropy-decoded entropy table index;

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

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

wherein;

the entropy-decoded entropy table index indicates at least one value which corresponds to a largest absolute value (LAV) among multiple indexes included in the particular entropy table,

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

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

each pilot difference value corresponds to each data element.

4. The apparatus of claim 3, wherein the entropy-encoded entropy table index is entropy-decoded using an entropy table which is reserved exclusively for entropy table indexes.

5. The apparatus of claim 3, wherein the particular entropy table is classified according to data type.

6. The apparatus of claim 3, wherein the data elements are parameters and the apparatus further comprises a plural-channel generation part reconstructing audio signal using the parameters.

7. The apparatus of claim 3, wherein the particular entropy table is used to perform two-dimensional entropy decoding of a parameter.

8. The apparatus of claim 3,

wherein the inputting part receives the pilot reference value, and

wherein the data decoding part entropy-decodes the pilot reference value using an entropy table which is reserved exclusively for pilot reference values.

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

receiving, by an audio coding apparatus, one or more pilot difference values and a codeword corresponding to an entropy-encoded entropy table index, wherein variable bits are allocated to the codeword based on frequency for use;

obtaining an entropy-decoded entropy table index by entropy-decoding the codeword;

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

wherein;

the entropy-decoded entropy table index indicates at least one value which corresponds to a largest absolute value (LAV) among multiple indexes included in the particular entropy table,

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

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

each pilot difference value corresponds to each data element.

10. The method of claim 9, wherein the codeword is entropy-decoded using an entropy table which is reserved exclusively for entropy table indexes.

11. The method of claim 9, wherein the particular entropy table is classified according to data type.

12. The method of claim 9, wherein the data elements are parameters and the method further comprises reconstructing audio signal using the parameters.

13. The method of claim 9, wherein the particular entropy table is used to perform two-dimensional entropy decoding of a parameter.

14. The method of claim 9, further comprising:

receiving the pilot reference value; and

,

entropy-decoding pilot reference value using an entropy table which is reserved exclusively for pilot reference values.