|
| |
| | Huffman coding - Wikipedia, the free encyclopedia |
 | | In computer science, Huffman coding is an entropy encoding algorithm used for lossless data compression. | | | LZW coding can also often be more efficient, particularly when the input symbols are not independently-distributed, because it does not depend on encoding each input symbol one at a time (instead, it batches up a variable number of input symbols into each encoded syntax element). | | | The term refers to the use of a variable-length code table for encoding a source symbol (such as a character in a file) where the variable-length code table has been derived in a particular way based on the estimated probability of occurrence for each possible value of the source symbol. |
|
http://en.wikipedia.org/wiki/Huffman_coding
(1559 words)
|
|
| |
| | Prefix code - Wikipedia, the free encyclopedia |
| | It is possible to specially design a variable-length code such that there is never any ambiguity. | | | One kind of data compression is to use a different code -- one that uses fewer bits per letter. | | | Certainly one could use a special symbol -- analogous to the period at the end of the sentence -- to mark where one letter ends and the next begins. |
|
http://en.wikipedia.org/wiki/Prefix_code
(1138 words)
|
|
| |
| | Lecture 24: Huffman Codes |
| | Then we use the Huffman algorithm to compute an optimal prefix tree, and we scan the file a second time, writing out the codewords of each character of the file. | | | The solution is adaptive Huffman coding, which builds the prefix tree incrementally in such a way that the coding always is optimal for the sequence characters already seen. | | | In fact, this is an optimal character code for this file (which is not to say that the file is not further compressible by other means). |
|
http://www.cs.cornell.edu/courses/cs312/2001sp/lecture/lecture_24.htm
(1169 words)
|
|
| |
| | Indexed-indirect addressing using prefix codes - Patent 4531200 |
| | The prefix codes and index values are merely catenated to provide multiple levels of indexed indirection, each pair of prefix codes and suffix values surrounding the instruction like a matched pair of parentheses. | | | The code also causes the processor to use a suffix byte (or other word) after that instruction as an index value to modify the indirect address. | | | The architectural cost of the invention is low because, apart from the one or two fixed code points taken from the op-code space, only the actual use of indexed indirection in a particular instance incurs the extra instruction length required by the prefix code and the index value. |
|
http://www.freepatentsonline.com/4531200.html
(5932 words)
|
|
| |
| | Entropy-coding system - Patent 4939583 |
| | Huffman/run length composite coding means for receiving as an input thereto an output from said data select means for effecting a Huffman/run length composite coding based on a Huffman/run length composite coding table in which a run length coding table and a Huffman coding table are combined. | | | Table 3 is a coding table (Huffman/run length composite coding table) generated, based on the coding tables of Table 1, so as to be suitable for the operation effected by the configuration of FIG. | | | Since the significant data can be classified into two kinds so as to be subjected to the Huffman coding without using any additional information, the total number of bits after the coding operation is minimized as compared with the case where the Huffman coding is achieved on data not classified into two kinds. |
|
http://www.freepatentsonline.com/4939583.html
(2983 words)
|
|
| |
| | [No title] |
| | The fixed-length code in our example can not be optimal since its tree is not a full binary tree.. | | | When algorithm terminates, the binary code for a character x is obtained by traversing the tree from root to x and concatenating the 0’s and 1’s assigned to tree edges. | | | Then, the number of bits to encode a file is B(T) = EMBED Equation.3 Constructing a Huffman code Huffman invented a greedy algorithm that constructs an optimal prefix code in a bottom-up manner. |
|
http://web.umr.edu/~ercal/355/Lectures/Section-16.3-HuffmanCodes.doc
(600 words)
|
|
| |
| | [No title] |
| | The codeword structure and optimal substructure of an optimal prefix code imply the correctness of the Huffman code. | | | A Huffman code for a set C of characters ai, i = 0,
, n-1, is an optimal binary prefix code in which the total # of bits is minimized | | | Suppose that T is a full binary tree representing an optimal prefix code, and x, y are sibling leaves of T with z as their parent. |
|
http://www-rcf.usc.edu/~xwang/cs570/usc_restricted/lectures/lect9/outlinee.htm
(313 words)
|
|
| |
| | An Introduction to Data Compression |
| | This code will be in the intialized string table as the code for a root. | | | It is possible that this code will not be in the string table, but let's assume for now that it is. Output the string corresponding to <code> to the codestream. | | | So it will output the code for P[...]P if it finds that P[...]PQ is not in the table. |
|
http://www.cis.udel.edu/~amer/CISC651/lzw.and.gif.explained.html
(2491 words)
|
|
| |
| | Encyclopedia: ZIP Code |
| | In telecommunication, a two-out-of-five code is a binary-coded decimal notation in which (a) each decimal digit is represented by a binary numeral consisting of five binary digits of which two are of one kind, called ones, and three are of the other kind, called zeros and... | | | The reason for ZIP codes boundaries to not match city limits could be one of two reasons. | | | This requires only a simple and often free font, and the knowledge of at least the main 5-digit code, if all 9 are not available. |
|
http://www.nationmaster.com/encyclopedia/ZIP-Code
(7457 words)
|
|
| |
| | [No title] |
| | NASM assembly code is then generated from // that parse tree. | | | This code leaves the value of the expression // in [esp]. | | | The primary purpose is to illustrate some principles // of programming languages, but keep in mind that the generated assembly // code is inefficient (primarily because it stores all temporary values // on the run-time stack instead of making good use of registers). |
|
http://www.cs.colorado.edu/~main/theory/leo/codegen-outline.cxx
(790 words)
|
|
| |
| | Coding |
| | When they do, code words can be allocated by using a binary tree. | | | Huffman's algorithm does give an optimal code if one is restricted to transmiting symbols one at a time. | | | Such codes can also be used to compress data for storage purposes. |
|
http://www.csse.monash.edu.au/~lloyd/tildeMML/Notes/Coding.html
(1553 words)
|
|
| |
| | 6 Mar 1996 |
| | One way to construct a binary prefix code is to use a binary tree. | | | Why does this algorithm produce the code with the minimum average string length. | | | The binary prefix code maps the letters to strings as follows: |
|
http://www.cs.cmu.edu/People/cburch/211-sp96/6Mar.html
(992 words)
|
|
| |
| | Greedy Algorithms |
| | A prefix code is optimal if the number of bits it uses to encode any sequence of characters is minimum possible. | | | In these notes, we derive an algorithm for computing an optimal prefix code. | | | (b) is minimum and obtain an optimal prefix code P' for M', then the resulting prefix code P is optimal. |
|
http://cgm.cs.mcgill.ca/~msuder/courses/360/lectures/huffman.html
(733 words)
|
|
| |
| | Howstuffworks "What do digits in phone numbers mean?" |
| | The biggest problem with this approach is that a lot of the numbers in a particular block may not be used by the company that owns them, but they are unavailable for use by anyone else. | | | Some numbers, such as those that would start with 0,1 or 911, are unavailable for use. | | | For example, HowStuffWorks moved into new offices in the summer of 2000, but our main phone number did not change. |
|
http://www.howstuffworks.com/question659.htm
(761 words)
|
|
| |
| | CIPO - Canadian Patent Database - Claims - 1223965 |
| | code field transferred to said address register means is said null string code signal, | | | said comparator means comprises means for determining when the contents of said prefix code field transferred to said address register means is a null string code signal, and | | | means for transferring the contents of the string code field of a location of said memory means addressed by said address register means to said code register means, and |
|
http://patents1.ic.gc.ca/claims?patent_number=1223965&language=EN
(2451 words)
|
|
| |
| | BarCode 1 Quick Tour FAQ |
| | The only disadvantage is that data must be coded in the barcode. | | | Even if you don't believe that guard bars carry no information and insist on applying the code table, you have to determine whether the digit is on the left side or the right side of the symbol. | | | This can be an additional cost, however the key to an effective barcode system is to generate the barcode as close to the source of the data as possible. |
|
http://www.adams1.com/pub/russadam/new.html
(3446 words)
|
|
| |
| | Interchange Tags Reference: Looping tags and Sub-tags |
| | In an [item-list] this is always the product code; in a loop list it is the value of the current argument; in a search it is whatever you have defined as the first mv_return_field (rf). | | | and the code is not present in a previous product file, you will get a blank or some value you don't want. | | | The current count on the list, starting from either 1 in a zero-anchored list like [loop] or [item-list], or from the match count in a search list. |
|
http://www.icdevgroup.org/i/dev/dev-4.8/ictags_3.html
(1181 words)
|
|
| |
| | Upc bar code development, bar code - OneKIT :: Software Development :: .NET Barcode Professional 2.0 |
| | One of the first successful bar codes, Code 39 developed by Dr. David Allais, The developers of the UPC believed that there would be fewer than 10000 | | | The idea for the barcode was developed by Norman Joseph Woodland and Bernard The EAN-13 and UPC codes commonly found on retail articles work this way. | | | The idea for the barcode was developed by Norman Joseph Woodland and [Bernard The EAN-13 and UPC codes commonly found on retail articles work this way. |
|
http://bar-code.allinfosites.com/q/bar-code-upc-bar-code-development.htm
(826 words)
|
|
| |
| | prefix code |
| | Algorithms and Theory of Computation Handbook, CRC Press LLC, 1999, "prefix code", from Dictionary of Algorithms and Data Structures, Paul E. Black, ed., NIST. | | | Note: From Algorithms and Theory of Computation Handbook, page 12-21, Copyright © 1999 by CRC Press LLC. | | | A prefix code may be represented by a coding tree. |
|
http://www.nist.gov/dads/HTML/prefixcode.html
(121 words)
|
|
| |
| | CS251- Winter 1999- Practice questions |
| | Construct the tree and note that a possible code would be 1, 01, 001, 0001,..., 0000001 and 0000000 in case n = 7. | | | This set contains practice questions on the choice of an algorithm or data structure, and on Huffman trees. | | | One Huffman code codes 0 as 0, 1 as 10 and 2 as 11. |
|
http://cgm.cs.mcgill.ca/~luc/practice99c-answers.html
(1042 words)
|
|
| |
| | Java Prefix Free Code Tree |
| | Prefix Free Codes or "Prefix Codes" are used to to encode data quickly and efficiently in computer science. | | | This applet will help you to intuitively understand the mathmatics behind such encoding. | | | You can trace out the code by moving the curror allong the message text or the encoded text using the arrow keys. |
|
http://www.geocities.com/brightyetvague/prog/java/prefix_free/PrefixFreeCodeApplet.html
(226 words)
|
|
| |
| | Optimal Maximal Encoding Different from Huffman Encoding |
| | Conversely, the above three types of optimal codes need not to be the Huffman codes. | | | International Conference on Information Technology: Coding and Computing (ITCC '01) p. | | | 0493, International Conference on Information Technology: Coding and Computing (ITCC '01), 2001. |
|
http://csdl2.computer.org/persagen/DLAbsToc.jsp?resourcePath=/dl/proceedings/&toc=comp/proceedings/itcc/2001/1062/00/1062toc.xml&DOI=10.1109/ITCC.2001.918845
(133 words)
|
|
| |
| | (Calude C.S., Tomescu I.) Optimum Extendible Prefix Codes |
| | To this aim we introduce the notion of optimum extendible prefix code and then, by modifying Huffman's algorithm, we give an effcient algorithm to construct the opti mum extension of a non-complete prefix code, provided the initial code is optimal. | | | Cristian S. Calude (Computer Science Department, The University of Auckland, Private Bag 92019, Auckland, New Zealand) | | | Keywords: Kraft's inequality, Huffman tree, optimum extendible prefix code |
|
http://www.jucs.org/jucs_3_11/optimum_extendible_prefix_codes
(177 words)
|
|
| |
| | Fast Prefix Code Processing (ResearchIndex) |
| | Abstract: As large main memory becomes more and more available at reasonable prices, processing speed of large data sets becomes more important than reducing main memory usage of internal data structures which are small compared to the available main memory capacity. | | | 330 A method for the construction of minimum redundancy codes (context) - Huffman - 1952 | | | In this paper we describe the use of a finite state machine for fast processing of prefix codes that significantly improves decoding performance in practice, and that is easy to implement. |
|
http://citeseer.ist.psu.edu/pajarola03fast.html
(524 words)
|
|
| |
| | [No title] |
| | * Search in the prefix:character memory (either the "fast memory" or * the hash-code table) for the code followed by this character. | | | 0) /* If slot is occupied */ goto probe; /* Look somewhere else */ nomatch: /* * Output the current prefix and designate a new prefix. | | | If not found, output the current prefix code, * generate a new prefix code and store "old_prefix:char" in the * table with "new_prefix" as its definition. |
|
http://www.math.utah.edu:8080/tex-archive/tools/compress/vms/lzcmp2.c
(556 words)
|
|
| |
| | Telephone Prefix Search in Area Code 213 |
| | We will correct any and all errors that we find or are brought to our attention at the next update. | | | Caveat: Although we have done our best to provide accurate information, errors can and will creep in. | | | We know about ALL new area codes long before they are implemented. |
|
http://www.thedirectory.org/pref/search/213.htm
(207 words)
|
|
| |
| | FONE*Data, the area code and prefix database |
| | Use it with your custom applications to maintain your telemarketing program, reduce data entry errors and grow your business. | | | FONE*Data also contains valuable Metropolitan Statistical Area and Designated Market Area codes to help you better target your customers. | | | FONE*Data allows you to match up telephone numbers to ZIP Code data. |
|
http://hallogram.com/mailers/fonedata
(332 words)
|
|
| |
| | Telcodata.US Full Area Code / Single Exchange Query |
| | If you were a member, you could be loading this into any version of Excel or Access (or any other software that understands CSV) right now, for less than you paid for your breakfast or lunch today. | | | Telcodata.US Full Area Code / Single Exchange Query | | | Switches by CLLI code, or Partial CLLI code lookup |
|
http://www.telcodata.us/telco.html
(203 words)
|
|
| |
| | Prefix code |
| | This means that when strings from the code are put together, you don't need any separators, since it's known when a string ends. | | | A prefix code, also called a comma-free code, is a code consisting of strings so that for any given string in the code, there is no shorter string in the code that is an initial substring of that string. | | | Examples of where prefix codes are used are Huffman coding and Country calling codes. |
|
http://www.eurofreehost.com/pr/Prefix_code.html
(150 words)
|
|
| |
| | ZIP*Select-create lists of ZIP codes by radius, county or SCF |
| | ZIP*Select will print and/or save to a file the ZIPs or Area Code and Prefixes in the county you specified. | | | System Requirements: DOS 5.0 or higher, 512K RAM and 5MB hard disk space. | | | Create a precise list of every ZIP Code or Area Code and Prefix combination in a specified area, using this unique program. |
|
http://hallogram.com/mailers/zipslct
(334 words)
|
|
| |
| | Table 6 |
| | ) Values for keyboard make/break (scan) code: 01h Esc 31h N 02h 1 ! | | | In addition to the keys listed in the table above, there are Del-> (delete forward) 70h Enter 74h SeeAlso: #00602 at INT 16/AX=6F07h,#03214 at INT 4A/AH=05h | | | The joystick's motion scancodes are converted into standard arrow keys by the BIOS, and the joystick and mouse button scan codes are converted to FFFFh codes in the BIOS keyboard buffer (see CMOS 15h"AMSTRAD"). |
|
http://www.delorie.com/djgpp/doc/rbinter/it/06/0.html
(155 words)
|
|
| |
| | Chevy Engine Codes Menu |
| | The above list of codes is a summarization, it is not complete. | | | The final digit could be a year code. | | | For example, select "DTR-HQ" if you'd like to find code DZ. |
|
http://www.nastyz28.com/spmenu.html
(216 words)
|
|
| |
| | Ravitz Software Inc. |
| | For the Canon BJC5500 you need a prefix code ("modify output" menu or /J option) to use paper larger than 12x18. | | | With new DeskJets use a prefix code ("modify output" or "other output" menu, or /J option) to set this up. | | | For C size paper, set a prefix code ("modify output" or "other output" menu, or /J option) to 27,67,132. |
|
http://www.concentric.net/%7Eravitz
(913 words)
|
|
| |
| | UCR Area Code/Prefix Change Information |
| | If you have a cellphone with a 909 area code, please check our cellphone information page. | | | As a part of the 827 prefix implementation, some departments have changed their phone numbers to take advantage of the UCR (827) prefix. | | | Beginning October 30, 2004, the 909 area code will no longer be valid for calls destined for campus. |
|
http://dial.ucr.edu/951
(189 words)
|
|
| |
| | SourceForge.net CVS Repository - diff - cvs: ... |
| | A class for managing bit- and byte-oriented output. | | | unsigned int m_shift; //used to check if start code is detected | | | Not a start code but part of data |
|
http://cvs.sourceforge.net/viewcvs.py/guliverkli/guliverkli/src/filters/parser/diracsplitter/libdirac/libdirac_common/bit_manager.h?r1=1.1&r2=1.2
(432 words)
|
|
| |
| | Method and apparatus for parsing source code using prefix analysis (US5812853) |
| | Show 5 U.S. patent(s) that reference this one | | | A method and apparatus for processing source code in a language processing system with improved parsing based on prefix analysis. | | | The level-one subtrees corresponding to the prefix may be stored in the form of a prefix tree along with the text of the top-level source code statements represented by the prefix and a parser delta indicating the effect of the code statements on the parser state. |
|
http://www.delphion.com/details?pn=US05812853__&language=en
(481 words)
|
|
| |
| | The Scream! - ntl prefix code |
| | Don't know about the internet access number 'cos I'm no longer with them. | | | But There ios no way that u can change the access number on the NTL dialler | | | If you dont use a dialler, is the ntl prefix code 1263? |
|
http://www.the-scream.co.uk/forums/t15818.html
(115 words)
|
|
| |
| | SBC - Help - Area Code Prefixes - Texas |
| | Prefix numbers switching from 915 to 432 area code | | | Prefix numbers switching from 915 to 325 area code | | | Prefix numbers remaining in the 915 area code |
|
http://www.sbc.com/gen/general?pid=1529
(230 words)
|
|
| |
| | List of country calling codes - Open Encyclopedia |
| | 671 – used to be Guam - now code 1 671 | | | The numbers are a prefix code so that no number has an initial segment that is an existing shorter number. | | | This is similar to the use of a trunk code in countries such as the United States, which uses a leading "1" to indicate that a national area code follows, except that the trunk code has been absorbed into the area code, for presentational reasons. |
|
http://open-encyclopedia.com/List_of_country_calling_codes
(641 words)
|
|
| |
| | WTI CAS-161A; Code Activated Switch -- User's Guide |
| | The code sequence is a user-selectable Prefix code and a Port Select code. | | | Assume the Prefix Code is ^Y and the Prefix Code Repetition Value is 1. | | | Assume the Prefix Code is ^V and the Prefix Code Repetition Value is 4. |
|
http://www.wti.com/guides/cs16_usr.htm
(2068 words)
|
|
| |
| | Data Element: International Telephone Number - U.S. Fish & Wildlife Service |
| | The first digit of the country code is always a number from 1 through 9; a leading zero is not permitted. | | | Country Code: N, NN, or NNN, where each N represents a number from 0 through 9. | | | A leading zero is required when the "011" access code is used. |
|
http://www.fws.gov/stand/standards/de_intertelephone.html
(667 words)
|
|
| |
| | [No title] |
| | Prefix coding: Each symbol (possible outcome for random variable) will map to a sequence of bits Prefix code — no code sequence is a prefix of another. | | | All prefix codes satisfy the following inequality: Kraft ineq. | | | how do we determine if we can make a prefix code? |
|
http://www.fas.harvard.edu/~libcs124/E210/classnotes/October15.doc
(325 words)
|
|
| |
| | Prefix code -- Facts, Info, and Encyclopedia article |
| | In other words, for any given valid (A linear sequence of symbols (characters or words or phrases)) string in the code, there is no shorter string in the code that is an initial substring of that string. | | | Examples of prefix codes are the variable-length (Click link for more info and facts about Huffman codes) Huffman codes, (Click link for more info and facts about country calling codes) country calling codes, and (Click link for more info and facts about ISBN) ISBNs. | | | Prefix code -- Facts, Info, and Encyclopedia article |
|
http://www.absoluteastronomy.com/encyclopedia/p/pr/prefix_code.htm
(115 words)
|
|
| |
| | New Area Code, Prefix for HSC Phone Numbers |
| | Area code 818 was recently split into 818 and 626; area code 714 will soon split into 714 and 949. | | | Area code 213 will split effective June 13, 1998, with a seven-month grace period when both the old and new area codes will work. | | | The area code and prefix changes will not affect campus five-digit dialing, however, and the current (213) 342-XXXX HSC phone numbers will continue to work from off-campus until Jan. 16, 1999, also the end of the grace period for the area code split. |
|
http://www.usc.edu/uscnews/stories/3255.html
(371 words)
|
|
| |
| | www.phrack.org |
| | Prefix CODE Prefix Code ------ ---- ------ ---- 432 575 867 552 521 557 868 573 522 452 869 574 524 557 872 571 567 574 921 972 569 978 991 552 694 972 993 952 831 552 994 573 837 557 997 977 838 573 227 852 839 952 527 877 Data Line. | | | ==Phrack Inc.== Volume One, Issue Four, Phile #2 of 11 Ringback Codes for the 314 NPA (Incomplete) Dial the code from below instead of your exchange, plus the last 4 #'s of your phone. | | | Flash switch hook and wait for tone, then hang up. |
|
http://www.phrack.org/show.php?p=4&a=2
(108 words)
|
|
| |
| | Telephone Prefix Location List |
| | To find a prefix location in a specific area code, click on the area code to go to the search page for that area code. | | | If an area code has recently undergone a split you may not find the new area code's listings yet. | | | If that happens use the area code before the split occurred. |
|
http://thedirectory.org/pref
(433 words)
|
|
| |
| | Town USA Search Page |
| | Type numbers in the form 425-555-1000 (area code is required). | | | * City and State not required when a ZIP Code is given. | | | If you enter a ZIP Code (for example: 94116), it will display any associated cities. |
|
http://www.town-usa.com/searchengines/search2.html
(543 words)
|
|
| |
| | Telecommunications : Area Code/Prefix Access |
| | 760, 619, 858, 818, 213, 310, 323, 562, 626, 661, 714, 805, 909, 949, 951 area codes and prefixes | | | (760) 757-2121 or toll-free outside 760 area code 1-888-201-8480 | | | 760 area code only; prefix 2## to 9## plus four digits |
|
http://www.miracosta.cc.ca.us/ais/ts/Telecomm/AreaCodePrefixAccess.htm
(250 words)
|
|
|
