http://l2.espacenet.com/espacenet/viewer?PN=EP0280549&CY=ep&LG=en&DB=EPD
Claims
- A method of compressing text data which comprises searching a
dictionary (15) for an input word and producing a corresponding
codeword if it is found in the dictionary (15) characterized by
calculating the occurrence frequency of the input word, and if that
frequency rises assigning a shorter codeword to the input word.
- A method according to claim 1 in which a new word is entered in the
dictionary (15).
- A method according to claim 1 or claim 2 in which the dictionary
(15) contrains pseudowords, and if the searching finds no ordinary
word, dividing the input word into pseudowords of fixed length and
searching for the pseudowords.
- A method according to claim 3 in which the pseudowords are one or
two characters in length.
- A method according to any preceding claim in which a word or
pseudoword having a low occurrence count is removed from the
dictionary (15).
- Apparatus for compressing text data which comprises means (14) for
searching a dictionary (15) for an input word and sending a
corresponding codeword to a modulator (18) characterized by an
occurrence frequency calculator (17) for the input word means for
assigning a shorter codeword to the input word if its occurrence
frequency rises.
- Apparatus according to claim 6 including means (16) for entering a
new word.
- Apparatus according to claim 6 or claim 7 including means (315) for
dividing an input word into pseudowords.
zip ZIPDATEI DATEI[EN] ...
This short command executes the huffman algorithm und violates
claim 4 this way. Futhermore, it violates claims 3, 2 and 1.
Letzte Änderung: 11. Januar 2003
Benedikt Wildenhain,
patente@benedikt-wildenhain.de