Signal processing using pilot based coding

• US 7,643,562 B2
• Filed: 10/04/2006
• Issued: 01/05/2010
• 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:
  US12/088,866
• Publication Number:
  US 20080270144A1
• Time in Patent Office: 1,189 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

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 mode information and obtaining a pilot reference value corresponding to a plurality of data and a pilot difference value corresponding to the pilot reference value according to data attribute indicated by the mode information and obtaining the data using the pilot reference value and the pilot difference value.

Claims

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

extracting, by an audio coding apparatus, mode information which indicates whether a parameter set is encoded;

when the mode information indicates that the parameter set is encoded, obtaining a pilot reference value and one or more pilot difference values;

obtaining data elements of a current group included in a current frame using the pilot reference value and the pilot difference values, without using data elements of an other frame; and

reconstructing a signal using the data elements of the current group,

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 the 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 mode information includes at least one of a read mode, a default mode, a previous mode, and an interpolation mode.

3. The method of claim 2, wherein the pilot reference value and the pilot difference values are obtained when the mode information corresponds to the read mode.

4. The method of claim 3, wherein the pilot reference value and the pilot difference values are obtained using a first parameter to identify a quantity of the read modes, and a second parameter to obtain the pilot difference values based on the first parameter.

5. The method of claim 1, wherein the pilot difference value is obtained per group band.

6. The method of claim 1, wherein the mode information indicates whether the parameter set is encoded in the current group.

7. The method of claim 1, further comprising:

when the mode information indicates that the parameter set is not encoded, obtaining a default parameter set,

wherein the signal is reconstructed using the default parameter set.

8. The method of claim 1, further comprising:

when the mode information indicates that the parameter set is not encoded, obtaining a previous parameter set,

wherein the signal is reconstructed using the previous parameter set.

9. The method of claim 1, further comprising:

when the mode information indicates that the parameter is not encoded, obtaining an interpolated parameter set,

wherein the signal is reconstructed using the interpolated parameter set.

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

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

12. The method of claim 1, wherein the data elements are obtained using PBC.

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

a decoding part configured to;

extract mode information which indicates whether a parameter set is encoded,

when the mode information indicates that the parameter set is encoded, obtain a pilot reference value and one or more pilot difference values, and

obtain data elements of a current group included in a current frame using the pilot reference value and the pilot difference values, without using data elements of an other frame; and

a reconstructing part configured to reconstruct a signal using the data elements of the current group,

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 the 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 mode information includes at least one of a read mode, a default mode, a previous mode, and an interpolation mode.

15. The apparatus of claim 14, wherein the pilot reference value and the pilot difference values are obtained when the mode information corresponds to the read mode.

16. The apparatus of claim 15, wherein the pilot reference value and the pilot difference values are obtained using a first parameter to identify a quantity of the read modes, and a second parameter to obtain the pilot difference values based on the first parameter.

17. The apparatus of claim 13, wherein the pilot difference value is obtained per group band.

18. The apparatus of claim 13, wherein the mode information indicates whether the parameter set is encoded in the current group.

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

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

an audio coding apparatus configured to;

extract mode information which indicates whether a parameter set is encoded,

when the mode information indicates that the parameter set is encoded, obtain a pilot reference value and one or more pilot difference values,

obtain data elements of a current group included in a current frame using the pilot reference value and the pilot difference values, without using data elements of an other frame, and

reconstruct a signal using the data elements of the current group,

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 the 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.