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

• US 7,671,766 B2
• Filed: 10/04/2006
• Issued: 03/02/2010
• 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): JEANGLAUDE, JEAN BRUNER
• Application Number:
  US12/088,872
• Publication Number:
  US 20080224901A1
• Time in Patent Office: 1,245 Days
• Field of Search: 341/50, 341/51, 341/76, 341/67, 704/201, 704/205, 704/500, 704/211, 704/212, 700/94
• US Class Current: 341/50
• 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 hierarchically extracting identification information indicating at least three or more data coding schemes. The identification information indicating two coding schemes having high frequencies of use for the identification information are extracted from different layers.

Claims

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

extracting, by an audio coding apparatus, first identification information which indicates whether a differential coding scheme is to be used, without extracting second identification information which indicates whether a pilot based coding scheme is to be used;

when the first identification information indicates that the differential coding scheme is to be used, decoding data elements of a current group included in a current frame with the differential coding scheme;

when the first identification information indicates that the differential coding scheme is not to be used, extracting the second identification indication which indicates whether the pilot based coding scheme is to be used;

when the second identification information indicates that the pilot based coding scheme is to be used, decoding the data elements of the current group included in the current frame with the pilot based coding scheme, using a pilot reference value and one or more pilot difference values; and

reconstructing an audio 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 audio coding apparatus comprises a processor.

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

4. The method of claim 1, wherein the first and second identification information comprise first and second bits stored in the current frame, respectively.

5. The method of claim 1, further comprising, when the first identification information indicates that the differential coding scheme is not to be used and the second identification information indicates that the pilot based coding scheme is not to be used, decoding the data elements included in the current frame with a third coding scheme.

6. The method of claim 5, wherein the third coding scheme comprises a pulse code modulation (PCM) coding scheme.

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

a demultiplexing part configured to;

extract first identification information which indicates whether a differential coding scheme is to be used, without extracting second identification information which indicates whether a pilot based coding scheme is to be used, and

when the first identification information indicates that the differential coding scheme is not to be used, extract the second identification indication which indicates whether the pilot based coding scheme is to be used;

a first data decoding part configured to, when the first identification information indicates that the differential coding scheme is to be used, decode data elements of a current group included in a current frame with the differential coding scheme;

a second data decoding part configured to, when the second identification information indicates that the pilot based coding scheme is to be used, decode the data elements of the current group included in the current frame with the pilot based coding scheme, using a pilot reference value and one or more pilot difference values; and

a reconstructing part configured to reconstruct an audio 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.

8. The apparatus of claim 7, wherein the pilot reference value represents an average value of the data elements of the current group, an intermediate value of the data elements of the current group, a most frequently used value of the data elements of the current group, or a default value.

9. The apparatus of claim 7, wherein the first and second identification information comprise first and second bits stored in the current frame, respectively.

10. The apparatus of claim 7, further comprising a third data decoding part configured to, when the first identification information indicates that the differential coding scheme is not to be used and the second identification information indicates that the pilot based coding scheme is not to be used, decode the data elements included in the current frame with a third coding scheme.

11. The apparatus of claim 10, wherein the third coding scheme comprises a pulse code modulation (PCM) coding scheme.

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

an audio coding apparatus configured to;

extract first identification information which indicates whether a differential coding scheme is to be used, without extracting second identification information which indicates whether a pilot based coding scheme is to be used,

when the first identification information indicates that the differential coding scheme is not to be used, extract the second identification indication which indicates whether the pilot based coding scheme is to be used,

when the first identification information indicates that the differential coding scheme is to be used, decode data elements of a current group included in a current frame with the differential coding scheme,

when the second identification information indicates that the pilot based coding scheme is to be used, decode the data elements of the current group included in the current frame with the pilot based coding scheme, using a pilot reference value and one or more pilot difference values, and

reconstruct an audio 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 a each data element of the current group.

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

14. The system of claim 12, wherein the first and second identification information comprise first and second bits stored in the current frame, respectively.

15. The system of claim 12, wherein the audio coding apparatus is further configured to, when the first identification information indicates that the differential coding scheme is not to be used and the second identification information indicates that the pilot based coding scheme is not to be used, decode the data elements included in the current frame with a third coding scheme.

16. The system of claim 15, wherein the third coding scheme comprises a pulse code modulation (PCM) coding scheme.