# US 2017/0289549 A1 · Nested Entropy Encoding

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- Number: US 2017/0289549 A1
- Document ID: US20170289549A1
- Status: Published application
- Kind: A1
- Application number: 15/623,627
- Filed: 2017-06-15
- Published: 2017-10-05
- Earliest claimed: 2010-10-01
- Assignees: Dolby International AB
- Applicants: Dolby International AB
- Inventors: Yeping Su; Christopher A. Segall
- Web page: https://patentgrep.com/patent/US20170289549A1

## CPC

- H04N 19/13: Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC]
- H03M 7/4031: {Fixed length to variable length coding}
- H03M 7/42: using table look-up for the coding or decoding process, e.g. using read-only memory {(H03M7/4006 takes precedence)}
- H03M 7/6076: {Selection between compressors of the same type}
- H04L 45/745: Address table lookup; Address filtering
- H04N 19/15: by monitoring actual compressed data size at the memory before deciding storage at the transmission buffer
- H04N 19/176: the region being a block, e.g. a macroblock
- H04N 19/46: Embedding additional information in the video signal during the compression process (H04N19/517, H04N19/68, H04N19/70 take precedence)
- H04N 19/52: by predictive encoding
- H04N 19/61: in combination with predictive coding
- H04N 19/70: characterised by syntax aspects related to video coding, e.g. related to compression standards
- H04N 19/91: Entropy coding, e.g. variable length coding [VLC] or arithmetic coding
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- H03M: CODING; DECODING; CODE CONVERSION IN GENERAL (using fluidic means F15C4/00; optical analogue/digital converters G02F7/00; coding, decoding or code conversion, specially adapted for particular applications, see the relevant subclasses, e.g. G01D, G01R, G06F, G06T, G09G, G10L, G11B, G11C, H04B, H04L, H04M, H04N; ciphering or deciphering for cryptography or other purposes involving the need for secrecy G09C)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

Methods and systems for improving coding decoding efficiency of video by providing a syntax modeler, a buffer, and a decoder. The syntax modeler may associate a first sequence of symbols with syntax elements. The buffer may store tables, each represented by a symbol in the first sequence, and each used to associate a respective symbol in a second sequence of symbols with encoded data. The decoder decodes the data into a bitstream using the second sequence retrieved from a table.

## Claims

### Claim 1

A decoding system for decoding received encoded data, said system comprising:
(a) a syntax modeler for associating a sequence of first symbols with syntax elements from said data;
(b) at least one buffer for storing a plurality of tables, each nested within a respective one of said sequence of first symbols, and each used to associate a respective one of a sequence of second symbols with encoded data; and
(c) a decoder that decodes said data into a bitstream using a selected respective one of said sequence of second symbols retrieved from a respective one of plurality of tables, where said bitstream is free from including any of said sequence of first symbols.