CA2176479A1 - Data Compression - Google Patents
Data CompressionInfo
- Publication number
- CA2176479A1 CA2176479A1 CA2176479A CA2176479A CA2176479A1 CA 2176479 A1 CA2176479 A1 CA 2176479A1 CA 2176479 A CA2176479 A CA 2176479A CA 2176479 A CA2176479 A CA 2176479A CA 2176479 A1 CA2176479 A1 CA 2176479A1
- Authority
- CA
- Canada
- Prior art keywords
- token
- data stream
- list
- primary memory
- lists
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
- H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
- H03M7/40—Conversion to or from variable length codes, e.g. Shannon-Fano code, Huffman code, Morse code
- H03M7/42—Conversion to or from variable length codes, e.g. Shannon-Fano code, Huffman code, Morse code using table look-up for the coding or decoding process, e.g. using read-only memory
Abstract
Methodology and concomitant circuitry for compacting an incoming data stream into an outgoing compacted data stream utilize a plurality of memories or lists. The incoming data stream is partitioned into a sequence of tokens. A primary memory (3262) stores each token, with the most recently appearing token occupying the top rank in the list. A secondary memory (3282) stores the location in the primary memory of each of a subset of tokens. The compacted data stream is generated as a coded representation of the token itself, the position of the token in the primary memory, or the position in secondary memory of the location of the token in primary memory. A tertiary list may also be employed to generate a coded representation of the position in the tertiary list of the secondary list. Searching of the lists is effected with a hashing function. Updating of the lists utilizes tree splaying.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/161,102 US5384568A (en) | 1993-12-02 | 1993-12-02 | Data compression |
US161,102 | 1993-12-02 | ||
PCT/US1994/013001 WO1995015617A1 (en) | 1993-12-02 | 1994-11-14 | Data compression |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2176479A1 true CA2176479A1 (en) | 1995-06-08 |
CA2176479C CA2176479C (en) | 1999-11-16 |
Family
ID=22579829
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002176479A Expired - Fee Related CA2176479C (en) | 1993-12-02 | 1994-11-14 | Data compression |
Country Status (5)
Country | Link |
---|---|
US (1) | US5384568A (en) |
EP (1) | EP0732008A4 (en) |
JP (1) | JP2979106B2 (en) |
CA (1) | CA2176479C (en) |
WO (1) | WO1995015617A1 (en) |
Families Citing this family (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07160684A (en) * | 1993-12-03 | 1995-06-23 | Matsushita Electric Ind Co Ltd | Method and device for compressing document |
US5525982A (en) * | 1994-04-15 | 1996-06-11 | International Business Machines Corporation | Method and means for character string pattern matching for compression and the like using minimal cycles per character |
US5635931A (en) * | 1994-06-02 | 1997-06-03 | International Business Machines Corporation | System and method for compressing data information |
US5778371A (en) * | 1994-09-13 | 1998-07-07 | Kabushiki Kaisha Toshiba | Code string processing system and method using intervals |
US5768564A (en) * | 1994-10-07 | 1998-06-16 | Tandem Computers Incorporated | Method and apparatus for translating source code from one high-level computer language to another |
US5625817A (en) * | 1995-02-28 | 1997-04-29 | Bmc Software, Inc. | Method of identifying DB2 objects to be recovered from an unavailable DASD volume without need to access the DASD volume itself and without need for pre-failure preparation |
JP3258552B2 (en) * | 1996-02-08 | 2002-02-18 | 富士通株式会社 | Data compression device and data decompression device |
US5794235A (en) * | 1996-04-12 | 1998-08-11 | International Business Machines Corporation | System and method for dynamic retrieval of relevant information by monitoring active data streams |
US6493347B2 (en) * | 1996-12-16 | 2002-12-10 | Juniper Networks, Inc. | Memory organization in a switching device |
US5909440A (en) * | 1996-12-16 | 1999-06-01 | Juniper Networks | High speed variable length best match look-up in a switching device |
US6127950A (en) * | 1998-02-16 | 2000-10-03 | Matsushita Electric Industrial Co., Ltd. | Transmission circuit and reception circuit |
US6605053B1 (en) | 1999-09-10 | 2003-08-12 | Percardia, Inc. | Conduit designs and related methods for optimal flow control |
JP2003516670A (en) * | 1999-12-10 | 2003-05-13 | モサイド・テクノロジーズ・インコーポレイテッド | Method and apparatus for longest match address lookup |
WO2001093525A2 (en) * | 2000-05-26 | 2001-12-06 | Citrix Systems, Inc. | Method and system for efficiently reducing graphical display data for transmission over a low bandwidth transport protocol mechanism |
US6880064B1 (en) * | 2000-06-21 | 2005-04-12 | Mosaid Technologies, Inc. | Method and apparatus for physical width expansion of a longest prefix match lookup table |
US6961011B2 (en) * | 2001-08-27 | 2005-11-01 | Freescale Semiconductor, Inc. | Data compression system |
US8671213B2 (en) | 2002-03-14 | 2014-03-11 | Citrix Systems, Inc. | Methods and apparatus for generating graphical and media displays at a client |
US7376695B2 (en) * | 2002-03-14 | 2008-05-20 | Citrix Systems, Inc. | Method and system for generating a graphical display for a remote terminal session |
US8171169B2 (en) * | 2005-03-14 | 2012-05-01 | Citrix Systems, Inc. | Method and apparatus for updating a graphical display in a distributed processing environment |
US8423673B2 (en) * | 2005-03-14 | 2013-04-16 | Citrix Systems, Inc. | Method and apparatus for updating a graphical display in a distributed processing environment using compression |
US8694684B2 (en) | 2006-08-21 | 2014-04-08 | Citrix Systems, Inc. | Systems and methods of symmetric transport control protocol compression |
US8335889B2 (en) * | 2008-09-11 | 2012-12-18 | Nec Laboratories America, Inc. | Content addressable storage systems and methods employing searchable blocks |
US11227520B1 (en) * | 2020-08-20 | 2022-01-18 | Microsoft Technology Licensing, Llc | Derivative-based encoding for scanning mirror timing |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4558302A (en) * | 1983-06-20 | 1985-12-10 | Sperry Corporation | High speed data compression and decompression apparatus and method |
US4612532A (en) * | 1984-06-19 | 1986-09-16 | Telebyte Corportion | Data compression apparatus and method |
US4796003A (en) * | 1984-06-28 | 1989-01-03 | American Telephone And Telegraph Company | Data compaction |
US4906991A (en) * | 1988-04-29 | 1990-03-06 | Xerox Corporation | Textual substitution data compression with finite length search windows |
US5003307A (en) * | 1989-01-13 | 1991-03-26 | Stac, Inc. | Data compression apparatus with shift register search means |
US5146221A (en) * | 1989-01-13 | 1992-09-08 | Stac, Inc. | Data compression apparatus and method |
US5126739A (en) * | 1989-01-13 | 1992-06-30 | Stac Electronics | Data compression apparatus and method |
US5010345A (en) * | 1989-12-28 | 1991-04-23 | International Business Machines Corporation | Data compression method |
US5023610A (en) * | 1990-06-13 | 1991-06-11 | Cordell Manufacturing, Inc. | Data compression method using textual substitution |
US5239298A (en) * | 1992-04-17 | 1993-08-24 | Bell Communications Research, Inc. | Data compression |
-
1993
- 1993-12-02 US US08/161,102 patent/US5384568A/en not_active Expired - Lifetime
-
1994
- 1994-11-14 EP EP95902518A patent/EP0732008A4/en not_active Withdrawn
- 1994-11-14 JP JP7515623A patent/JP2979106B2/en not_active Expired - Lifetime
- 1994-11-14 WO PCT/US1994/013001 patent/WO1995015617A1/en not_active Application Discontinuation
- 1994-11-14 CA CA002176479A patent/CA2176479C/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
EP0732008A1 (en) | 1996-09-18 |
WO1995015617A1 (en) | 1995-06-08 |
CA2176479C (en) | 1999-11-16 |
EP0732008A4 (en) | 2000-10-04 |
JPH09505707A (en) | 1997-06-03 |
US5384568A (en) | 1995-01-24 |
JP2979106B2 (en) | 1999-11-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |