Signal processing using pilot based coding

• US 7,660,358 B2
• Filed: 10/04/2006
• Issued: 02/09/2010
• 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, Lim, Jae Hyun, Jung, Yang Won, Kim, Dong Soo, Kim, Hyo Jin, Oh, Hyen O
• Primary Examiner(s): Payne; David C
• Assistant Examiner(s): DSOUZA, JOSEPH FRANCIS A
• Application Number:
  US12/088,871
• Publication Number:
  US 20080262851A1
• Time in Patent Office: 1,224 Days
• Field of Search: None
• 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 a number of data corresponding to a pilot reference value and if a number of data bands meets a predetermined condition, obtaining the pilot reference value and a pilot difference value corresponding to the pilot reference value 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:

determining, by an audio coding apparatus, a quantity of data bands;

when the quantity of data bands satisfies a predetermined quantity threshold, extracting 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; 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 pilot reference value represents an intermediate, average, or most frequently used value associated with the data elements of the current group.

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

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

5. The method of claim 1, wherein:

the data elements correspond to parameters, and

the signal is reconstructed using the parameters.

6. The method of claim 1, wherein the predetermined quantity threshold comprises three data bands or five data bands.

7. The method of claim 1, further comprising:

when the quantity of data bands fails to satisfy the predetermined quantity threshold, reconstructing the signal using a differential (DIFF) coding scheme or a pulse code modulation (PCM) coding scheme.

8. The method of claim 1, further comprising:

selecting the predetermined quantity threshold based upon an efficiency characteristic of two or more coding schemes including a pilot based coding scheme.

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

a determining part configured to determine a quantity of data bands;

an extracting part configured to, when the quantity of data bands satisfies a predetermined quantity threshold, extract a pilot reference value and one or more pilot difference values;

an obtaining part configured to obtain data elements of a current group included in a current frame using the pilot reference value and the pilot difference values; 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.

10. The apparatus of claim 9, 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 apparatus of claim 9, wherein the data elements are obtained using PBC.

12. The apparatus of claim 9, wherein:

the data elements correspond to parameters, and

the signal is reconstructed using the parameters.

13. The apparatus of claim 9, wherein the predetermined quantity threshold comprises three data bands or five data bands.

14. The apparatus of claim 9, wherein the reconstructing part is further configured to, when the quantity of data bands fails to satisfy the predetermined quantity threshold, reconstruct the signal using a differential (DIFF) coding scheme or a pulse code modulation (PCM) coding scheme.

15. The apparatus of claim 9, further comprising a selecting part configured to:

select the predetermined quantity threshold based upon an efficiency characteristic of two or more coding schemes including a pilot based coding scheme.

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

an audio coding apparatus configured to;

determine a quantity of data bands;

when the quantity of data bands satisfies a predetermined quantity threshold, extract 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; 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.

17. The system of claim 16, wherein the pilot reference value represents an intermediate, average, or most frequently used value associated with the data elements of the current group.

18. The system of claim 16, wherein the data elements are obtained using pilot based coding (PBC).

19. The system of claim 16, wherein:

the data elements correspond to parameters, and

the signal is reconstructed using the parameters.

20. The system of claim 16, wherein the predetermined quantity threshold comprises three data bands or five data bands.

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

deciding, by an audio coding apparatus, whether a pilot coding scheme is included in a plurality of data coding schemes according to a quantity of data bands;

determining one data coding scheme among the plurality of data coding schemes;

decoding data elements of a current group included in a current frame according to the determined data coding scheme; and

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

wherein;

when the determined data coding scheme corresponds to the pilot coding scheme, the data elements are generated using pilot reference value and one or more pilot difference values,

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.

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

a deciding part configured to decide whether a pilot coding scheme is included in a plurality of data coding schemes according to a quantity of data bands;

a determining part configured to determine one data coding scheme among the plurality of data coding schemes;

an obtaining part configured to obtain data elements of a current group included in a current frame according to the determined data coding scheme; and

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

wherein;

when the determined data coding scheme corresponds to the pilot coding scheme, the data elements are generated using pilot reference value and one or more pilot difference values,

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 group current,

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.