Signal processing using pilot based coding

• US 7,756,702 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:
  US12/089,102
• Publication Number:
  US 20090254354A1
• 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 pilot reference value corresponding to a plurality of data 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, the method comprising:

receiving, by an audio coding apparatus, a downmix signal and spatial information;

extracting a pilot reference value and one or more pilot difference values from the spatial information;

obtaining one or more 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 another 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 another 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,

each pilot difference value corresponds to each data element of the current group, and

the data elements comprise at least one of a channel level difference, an interchannel coherence and a channel prediction coefficient.

2. The method of claim 1, wherein the pilot reference value comprises one of an average value, an intermediate value, a most frequently used value and a default value of the data elements.

3. The method of claim 1, wherein the pilot reference value is one value extracted from a table.

4. The method of claim 1, further comprising selecting the data elements having highest encoding efficiency as a pilot reference value after the pilot reference value has been set to each of the data elements.

5. A method for processing a signal using pilot based coding, the method comprising:

generating, by an audio coding apparatus, one or more data elements of a current group included in a current frame and a downmix signal by downmixing a multi-channel signal;

generating one or more pilot difference values using a pilot reference value and the data elements of the current group, without using data elements of another frame; and

transferring spatial information including the pilot difference values,

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 another 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,

each pilot difference value corresponds to each data element of the current group, and,

the data elements comprise at least one of a channel level difference, an interchannel coherence and a channel prediction coefficient.

6. An apparatus for processing a signal using pilot based coding, the apparatus comprising:

a channel downmixing part generating a downmix signal by downmixing a multi-channel signal;

a value generating part generating one or more pilot difference values using a pilot reference value and the data elements of the current group, without using data elements of another frame; and

an outputting part transferring spatial information including the pilot difference values, 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,

each pilot difference value corresponds to each data element of the current group, and

the data elements comprise at least one of a channel level difference, an interchannel coherence and a channel prediction coefficient.

7. An apparatus for processing a signal using pilot based coding, the apparatus comprising:

a demultiplexing part receiving a downmix signal and spatial information;

a value obtaining part extracting a pilot reference value and one or more pilot difference values from the spatial information;

a data obtaining part obtaining one or more 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 another frame; and

a multi-channel signal generation part 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,

each pilot difference value corresponds to each data element of the current group, and

the data elements comprise at least one of a channel level difference, an interchannel coherence and a channel prediction coefficient.

8. The apparatus of claim 7, wherein the pilot reference value comprises one of an average value, an intermediate value, a most frequently used value and a default value of the data elements.

9. The apparatus of claim 7, wherein the pilot reference value is one value extracted from a table.