Audio signal processing using pilot based coding

• US 7,756,701 B2
• Filed: 10/04/2006
• Issued: 07/13/2010
• 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:
  US12/088,958
• Publication Number:
  US 20080255858A1
• Time in Patent Office: 1,378 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 reference value corresponding to a plurality of data and a difference value corresponding to the reference value and entropy-decoding the difference value and obtaining the data using the reference value and the entropy-decoded difference value.

Claims

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

an audio coding apparatus configured to;

receive a downmix signal and spatial information,

obtain, by an audio coding apparatus, a pilot reference value and one or more pilot difference values from the spatial information,

entropy-decode the pilot difference values,

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

generate a multi-channel signal by applying the data elements of the current group to the downmix signal,

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 system 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.

3. The system of claim 1, wherein:

the audio coding apparatus is further configured to entropy-decode the pilot reference value, and

the data elements of the current group are obtained using the entropy-decoded pilot reference value and the entropy-decoded pilot difference values.

4. The system of claim 3, wherein:

the audio coding apparatus is further configured to obtain entropy coding identification information, and

the pilot reference value is entropy-decoded according to an entropy coding scheme indicated by the entropy coding identification information.

5. The system of claim 4, wherein:

the entropy coding scheme comprises a one-dimensional coding scheme or a multi-dimensional coding scheme, and

the multi-dimensional coding scheme comprises a frequency pair (FP) coding scheme or a time pair (TP) coding scheme.

6. An audio coding apparatus for processing a signal, the audio coding apparatus comprising:

an obtaining part configured to;

receive a downmix signal and spatial information,

obtain a pilot reference value and one or more pilot difference values from the spatial information, and

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

a decoding part configured to entropy-decode the pilot difference values; and

a reconstructing part configured to generate a multi-channel signal by applying the data elements of the current group to the downmix signal,

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.

7. The apparatus of claim 6, wherein the pilot reference value represents and intermediate, average, or most frequently used value associated with the data elements of the current group.

8. The apparatus of claim 6, wherein:

the decoding part is further configured to entropy-decode the pilot reference value, and

the data elements of the current group are obtained using the entropy-decoded pilot reference value and the entropy-decoded pilot difference values.

9. The apparatus of claim 8, wherein:

the obtaining part is further configured to obtain entropy coding identification information, and

the pilot reference value is entropy-decoded according to an entropy coding scheme indicated by the entropy coding identification information.

10. The apparatus of claim 9, wherein:

the entropy coding scheme comprises a one-dimensional coding scheme or a multi-dimensional coding scheme, and

the multi-dimensional coding scheme comprises a frequency pair (FP) coding scheme or a time pair (TP) coding scheme.

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

receiving a downmix signal and spatial information;

obtaining, by an audio coding apparatus, a pilot reference value and one or more pilot difference values from the spatial information;

entropy-decoding the pilot difference values;

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

generating a multi-channel signal by applying the data elements of the current group to the downmix signal,

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.

12. The method of claim 11, wherein the pilot reference value represents and intermediate, average, or most frequently used value associated with the data elements of the current group.

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

14. The method of claim 11, further comprising:

entropy-decoding the pilot reference value,

wherein the data elements of the current group are obtained using the entropy-decoded pilot reference value and the entropy-decoded pilot difference values.

15. The method of claim 14, further comprising:

obtaining entropy coding identification information,

wherein the pilot reference value is entropy-decoded according to an entropy coding scheme indicated by the entropy coding identification information.

16. The method of claim 15, wherein:

the entropy coding scheme comprises a one-dimensional coding scheme or a multi-dimensional coding scheme, and

the multi-dimensional coding scheme comprises a frequency pair (FP) coding scheme or a time pair (TP) coding scheme.