METHOD AND APPARATUS FOR ENCODING/DECODING MEDIA SIGNAL

• US 20090060024A1
• Filed: 04/23/2008
• Published: 03/05/2009
• Est. Priority Date: 08/31/2007
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lee, Nam-suk, Jeong, Jong-hoon, Lee, Chul-woo, Lee, Geon-hyoung, Moon, Han-gil
• Granted Patent: US 8,422,560 B2
• Time in Patent Office: Days
• US Class Current: 375/240
• CPC Class Codes: H04N 21/235 Processing of additional data, e.g. scrambling of additional data or processing content descriptors
• CPC Class Codes: H04N 21/23892 involving embedding information at multiplex stream level, e.g. embedding a watermark at packet level
• 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: H04N 21/6332 directed to client
• CPC Class Codes: H04N 21/6336 directed to decoder
• CPC Class Codes: H04N 21/654 Transmission by server directed to the client
• CPC Class Codes: H04N 21/6547 comprising parameters, e.g. for client setup

Abstract

A method and apparatus for encoding/decoding a media signal. The method of decoding a media signal includes extracting first table index information from a header. The first table index information indicates M (M<N) tables substantially referred to by frames from among N tables which can be referred to for performing an operation performed by the frames, wherein N and M are natural numbers. Second table index information is then extracted from each frame. The second table index information indicates tables referred to by each frame from among M tables. The tables, which are referred to by the frames, are then identified by using the first and second table index information and the frames are decoded by referring to identified tables.

Claims

1. A method of encoding a media signal comprising a header and a plurality of frames, the method comprising:

generating a first table index information indicating M tables from N tables, the M tables being substantially referred to by the frames for performing an operation performed by the frames, wherein M and N are natural numbers and M<

N;

inserting the first table index information into the header;

generating a second table index information indicating tables referred to by each frame from among M tables;

inserting the second table index information into each of the plurality of frames; and

encoding the header and the frames.

2. The method of claim 1, wherein the first table index information comprises M.

3. The method of claim 2, wherein the first table index information is expressed in (log₂N)*M+M bits.

4. The method of claim 1, wherein the second table index information is expressed as a product of the number of bits for identifying M tables and a frequency in which the tables are referred to by each frame.

5. The method of claim 1, wherein the tables comprise at least one of a table used in entropy coding for data compression, an exponential function table, a log function table, and a trigonometric function table for reducing one of complexity and workload of an operation, a coefficient table for filtering data, Fast Fourier Transform (FFT), Discrete Cosine Transform (DCT), Discrete Fourier Transform (DFT), and Wavelet tables for spatial movement, and SWAP and Direct Memory Access (DMA) for replacing, copying, and moving data.

6. The method of claim 1, wherein the generating of the first table index information further comprises identifying the M and using information relating to the M tables.

7. A method of decoding a media signal comprising a header and a plurality of frames, the method comprising:

extracting a first table index information from the header, the first table index information indicating M tables from among N tables, the M tables being substantially referred to by the frames for performing an operation performed by the frames, wherein M and N are natural numbers and M<

N;

extracting a second table index information from each frame, the second table index information indicating tables referred to by each frame from among the M tables;

identifying the tables referred to by the frames by using the first and second table index information; and

decoding the frames by referring to the identified tables.

8. The method of claim 7, wherein the first table index information comprises M.

9. The method of claim 8, wherein the first table index information is expressed by using (log₂N)*M+M bits.

10. The method of claim 7, wherein the second table index information is expressed as a product of the number of bits for identifying M tables and a frequency in which the tables are referred to by each frame.

11. The method of claim 7, wherein the tables comprise at least one of a table used in entropy coding for data compression, an exponential function table, a log function table, and a trigonometric function table for reducing one of complexity and workload of an operation, a coefficient table for filtering data, Fast Fourier Transform (FFT), Discrete Cosine Transform (DCT), Discrete Fourier Transform (DFT), and Wavelet tables for spatial movement, and SWAP and Direct Memory Access (DMA) for replacing, copying, and moving data.

12. An apparatus for encoding a media signal comprising a header and a plurality of frames, the apparatus comprising:

a first table index information generating unit which generates first table index information indicating M tables from N tables, the M tables being substantially referred to by the frames for performing an operation performed by the frames, wherein M and N are natural numbers and M<

N;

a second table index information generating unit which generates second table index information indicating tables referred to by each frame from among the M tables; and

a table index information inserting unit which inserts the first table index information into the header and the second table index information into each of the plurality of frames.

13. The apparatus of claim 12, wherein the first table index information generating unit comprises M.

14. The apparatus of claim 13, wherein the first table index information is expressed in (log₂N)*M+M bits.

15. The apparatus of claim 12, wherein the second table index information is expressed as a product of the number of bits for identifying M tables and a frequency in which the tables are referred to by each frame.

16. The apparatus of claim 12, further comprising an encoding unit which encodes the header and the frames.

17. The apparatus of claim 12, wherein the tables comprise at least one of a table used in entropy coding for data compression, an exponential function table, a log function table, and a trigonometric function table for reducing one of complexity and workload of an operation, a coefficient table for filtering data, Fast Fourier Transform (FFT), Discrete Cosine Transform (DCT), Discrete Fourier Transform (DFT), and Wavelet tables for spatial movement, and SWAP and Direct Memory Access (DMA) for replacing, copying, and moving data.

18. An apparatus for decoding a media signal comprising a header and a plurality of frames, the apparatus comprising:

a first table index information extracting unit which extracts first table index information from the header, the first table index information indicating M tables from N tables, the M tables being substantially referred to by the frames for performing an operation performed by the frames, wherein M and N are natural numbers and M<

N;

a second table index information extracting unit which extracts second table index information from each frame, the second table index information indicating tables referred to by each frame from among the M tables;

a table identifying unit which identifies the tables referred to by the tables by using the first and second table index information; and

a decoding unit which decodes the frames by referring to the identified tables.

19. The apparatus of claim 18, wherein the first table index information comprises M.

20. The apparatus of claim 19, wherein the first table index information is expressed by using (log₂N)*M+M bits.

21. The apparatus of claim 18, wherein the second table index information is expressed as a product of the number of bits for identifying M tables and a frequency in which the tables are referred to by each frame.

22. The apparatus of claim 18, wherein the tables comprise at least one of a table used in entropy coding for data compression, an exponential function table, a log function table, and a trigonometric function table for reducing one of complexity and workload of an operation, a coefficient table for filtering data, Fast Fourier Transform (FFT), Discrete Cosine Transform (DCT), Discrete Fourier Transform (DFT), and Wavelet tables for spatial movement, and SWAP and Direct Memory Access (DMA) for replacing, copying, and moving data.