Registration apparatus for compound-word dictionary

• US 5,867,812 A
• Filed: 03/14/1996
• Issued: 02/02/1999
• Est. Priority Date: 08/14/1992
• Status: Expired due to Fees

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Sassano, Manabu
• Primary Examiner(s): Thomas, Joseph
• Application Number:
  US08/615,082
• Time in Patent Office: 1,055 Days
• Field of Search: 704/1, 704/2, 704/10, 704/4, 704/6, 704/7, 704/8, 707/532, 707/533, 707/536
• US Class Current: 704/10
• CPC Class Codes: G06F 40/232 Orthographic correction, e.g. spell checking or vowelisation
• CPC Class Codes: G06F 40/247 Thesauruses; Synonyms
• CPC Class Codes: G06F 40/268 Morphological analysis
• CPC Class Codes: G06F 40/53 Processing of non-Latin text kana-to-kanji conversion G06F40/129; vowelisation G06F40/232

Abstract

A registration apparatus for a compound-word dictionary automatically and suitably determines whether a combination of character strings must be registered as one entry word in a compound-word dictionary. The registration apparatus comprises a character string segmenter which segments a compound-word into its individual words. The frequency that each individual word occurs in entry words of a compound-word dictionary is determined by an occurrence frequency calculator. An evaluation value calculator calculates an evaluation value based on the occurrence frequencies. Based on this evaluation value, a register determiner then determines if the compound-word is to be registered in the compound-word dictionary. The process for obtaining an evaluation value may depend on the number of component words and contents of the existing dictionary, a physical size limit on the compound-word dictionary and the purpose of use of the dictionary.

Claims

1. An apparatus for registering a combination of character strings in a compound-word dictionary, comprising:

a word dictionary containing a plurality of words;

a compound-word dictionary containing entry words that are combinations of character strings;

segmenting means for segmenting an input combination of character strings into individual character strings by referring to said word dictionary;

occurrence frequency calculating means for calculating an occurrence frequency of each of said segmented individual character strings in said entry words in said compound-word dictionary;

evaluation value calculating means for calculating the evaluation value of said input combination of character strings on the basis of said calculated occurrence frequencies of each of said segmented individual character strings; and

means for determining whether or not to register said combination of character strings in said compound-word dictionary on the basis of said evaluation value, and registering said combination of character strings as an entry word in said compound-word dictionary when it is determined that said combination of character strings should be registered.

2. An apparatus for registering a compound word in a compound-word dictionary, comprising:

a word dictionary containing a plurality of words;

a compound-word dictionary containing entry words that are compound words;

segmenting means for segmenting an input compound word into individual words by referring to said word dictionary;

occurrence frequency calculating means for calculating an occurrence frequency of each of said segmented individual words in said entry words in said compound-word dictionary;

evaluation value calculating means for calculating the evaluation value of said input compound word on the basis of said calculated occurrence frequencies of each of said segmented individual words; and

means for determining whether to register said compound word in said compound-word dictionary on the basis of said evaluation value, and registering said compound word as an entry word in said compound-word dictionary when it is determined that said compound word should be registered.

3. An apparatus according to claim 2, wherein,

the compound-word dictionary includes compound-words in a first language in correspondence with equivalent words in a second language.

4. An apparatus according to claim 3, wherein for each said compound-word in the first language, the compound-word dictionary contains, in correspondence with said corresponding compound-word in the first language, notation, pronunciation, and the corresponding equivalent word in the second language.

5. An apparatus according to claim 3, wherein:

the evaluation value is calculated based on grammar information concerning each individual word of the compound-word, in addition to the occurrence frequency.

6. An apparatus according to claim 3, wherein:

each individual word in the compound-word has a position within the compound-word; and

the evaluation value is calculated according to the position of each individual word in the compound-word, in addition to the occurrence frequency.

7. An apparatus according to claim 2, wherein:

the compound-word dictionary includes compound-words converted by the segmenting means from one notation to another notation in the same language.

8. An apparatus according to claim 7, wherein:

the compound-word dictionary includes notation and pronunciation for each compound-word.

9. An apparatus according to claim 7, wherein:

the evaluation value is obtained based on grammar information about each individual word of the compound-word, in addition to the occurrence frequency.

10. An apparatus according to claim 7, wherein:

the evaluation value is calculated based on the position of each individual word in the compound-word, in addition to the occurrence frequency.

11. An apparatus according to claim 2, wherein:

the compound-word dictionary includes compound words in the form of a first notation and a second notation in the same language.

12. An apparatus according to claim 11, wherein:

said first notation is a Japanese notation using Chinese characters and the second notation is a Japanese notation based on pronunciation.