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

• US 7,696,907 B2
• Filed: 10/09/2006
• Issued: 04/13/2010
• 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, Lim, Jae Hyun, Jung, Yang Won, Kim, Dong Soo, Kim, Hyo Jin, Oh, Hyen O
• Primary Examiner(s): WILLIAMS, HOWARD L
• Application Number:
  US12/089,098
• Publication Number:
  US 20090091481A1
• Time in Patent Office: 1,282 Days
• Field of Search: 341/50, 341/76, 341/77, 700/94, 704/201, 704/219, 704/500, 704/501
• US Class Current: 341/76
• 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 19/20 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: 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 group reference value corresponding to a plurality of data included in one group through grouping including first grouping and second grouping and a first difference value corresponding to the group reference value and obtaining the data using the group reference value and the first difference value.

Claims

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

obtaining, by an audio coding apparatus, channel grouping information identifying a group of low frequency parameters bands to apply to a low frequency channel when a low frequency channel (LFE) mode is specified;

obtaining a pilot reference value and one or more pilot difference values associated with the identified group of low frequency parameter bands; and

obtaining data elements of the identified group of low frequency parameter bands using the pilot reference value and the one or more pilot difference values,

wherein;

the pilot reference value is dependent on the data elements of the identified group of low frequency parameter bands included in a current frame, and is not dependent on data elements of an other frame,

a quantity of the pilot difference values is equal to a quantity of the data elements of the identified group of low frequency parameter bands,

the pilot reference value is a single value which applies to all of the data elements of the identified group of low frequency parameter bands, and

each pilot difference value corresponds to each data element of the identified group of low frequency parameter bands.

2. The method of claim 1, further comprising:

decoding the pilot reference value or at least one of the pilot difference values.

3. The method of claim 1, further comprising:

reconstructing an audio signal using the data elements.

4. The method of claim 1, wherein the channel grouping information indicates at least one of:

a position of the group,

whether to apply the pilot reference value to the group,

a coding scheme associated with the pilot reference value, and

whether to receive the pilot reference value.

5. The method of claim 1, further comprising:

receiving the channel grouping information.

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

7. The method of claim 1, wherein the pilot reference value represents an average value of the data elements of the identified group of low frequency parameter bands, an intermediate value of the data elements of the identified group of low frequency parameter bands, a most frequently used value of the data elements of the identified group of low frequency parameter bands, or a default value.

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

an obtaining part configured to;

obtain channel grouping information identifying a group of low frequency parameters bands to apply to a low frequency channel when a low frequency channel (LFE) mode is specified,

obtain a pilot reference value and one or more pilot difference values associated with the identified group of low frequency parameter bands, and

obtain data elements of the identified group of low frequency parameter bands using the pilot reference value and the one or more pilot difference values,

wherein;

the pilot reference value is dependent on the data elements of the identified group of low frequency parameter bands included in a current frame, and is not dependent on data elements of an other frame,

a quantity of the pilot difference values is equal to a quantity of the data elements of the identified group of low frequency parameter bands,

the pilot reference value is a single value which applies to all of the data elements of the identified group of low frequency parameter bands, and

each pilot difference value corresponds to each data element of the identified group of low frequency parameter bands.

9. The apparatus of claim 8, further comprising a decoding part configured to:

decode the pilot reference value or at least one of the pilot difference values.

10. The apparatus of claim 8, further comprising a reconstructing part configured to:

reconstruct an audio signal using the data elements.

11. The apparatus of claim 8, wherein the channel grouping information indicates at least one of:

a position of the group,

whether to apply the pilot reference value to the group,

a coding scheme associated with the pilot reference value, and

whether to receive the pilot reference value.

12. The apparatus of claim 8, further comprising a receiving part configured to:

receive the channel grouping information.

13. The apparatus of claim 8, farther comprising a processor.

14. The apparatus of claim 8, wherein the pilot reference value represents an average value of the data elements of the identified group of low frequency parameter bands, an intermediate value of the data elements of the identified group of low frequency parameter bands, a most frequently used value of the data elements of the identified group of low frequency parameter bands, or a default value.

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

an audio coding apparatus configured to;

obtain channel grouping information identifying a group of low frequency parameters bands to apply to a low frequency channel when a low frequency channel (LFE) mode is specified,

obtain a pilot reference value and one or more pilot difference values associated with the identified group of low frequency parameter bands, and

obtain data elements of the identified group of low frequency parameter bands using the pilot reference value and the one or more pilot difference values,

wherein;

the pilot reference value is dependent on the data elements of the identified group of low frequency parameter bands included in a current frame, and is not dependent on data elements of an other frame,

a quantity of the pilot difference values is equal to a quantity of the data elements of the identified group of low frequency parameter bands,

the pilot reference value is a single value which applies to all of the data elements of the identified group of low frequency parameter bands, and

each pilot difference value corresponds to a single data element of the identified group of low frequency parameter bands.

16. The system of claim 15, wherein the audio coding apparatus is further configured to:

decode the pilot reference value or at least one of the pilot difference values.

17. The system of claim 15, wherein the audio coding apparatus is further configured to:

reconstruct an audio signal using the data elements.

18. The system of claim 15, wherein the channel grouping information indicates at least one of:

a position of the group,

whether to apply the pilot reference value to the group,

a coding scheme associated with the pilot reference value, and

whether to receive the pilot reference value.

19. The system of claim 15, wherein the audio coding apparatus is further configured to:

receive the channel grouping information.

20. The system of claim 15, wherein the pilot reference value represents an average value of the data elements of the identified group of low frequency parameter bands, an intermediate value of the data elements of the identified group of low frequency parameter bands, a most frequently used value of the data elements of the identified group of low frequency parameter bands, or a default value.