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The
Cologne phonetics matches each letter of a word to a digit between "0" and "8". To select the appropriate digit, at most one adjacent letter is used as a context. Some rules apply specifically to the initials of words. In this way similar sounds are supposed to be assigned the same code. The
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which assigns to words a sequence of digits, the phonetic code. The aim of this procedure is that identical sounding words have the same code assigned to them. The algorithm can be used to perform a similarity search between words. For example, it is possible in a name list to find entries like
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Lowercase letters are encoded accordingly; all other characters (such as hyphens) are ignored. For the umlauts Ä, Ö, Ü, as well as ß, that are not taken into account in the conversion table, it suggests itself to match them to the vowels (code "0") respective to the group S, Z (code "8").
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letters "W" and "V" for example, are both encoded with the number "3". The phonetic code for "Knowledge" is "3412" (W=3, K=4, P=1, and D=2). Unlike the
Soundex code, the length of the codes from the Cologne phonetics method is not limited.
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in line 10 of the table. This is not explicitly mentioned in the original publication but can be inferred from the examples listed there, e.g. for "Breschnew" the code "17863" is specified.
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383:(PDF-Datei; 502 kB). Magisterarbeit an der Philosophischen Fakultät der Universität zu Köln, 2005; enthält eine Implementierung in der Programmiersprache
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phonetic algorithm but is optimized to match the German language. The algorithm was published in 1969 by Hans
Joachim Postel.
90:"Meier" under different spellings such as "Maier", "Mayer", or "Mayr". The Cologne phonetics is related to the well known
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That for the letter "C" the rule "SC" has priority over the rule "CH" was taken into account by the addition of
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Die Kölner
Phonetik. Ein Verfahren zur Identifizierung von Personennamen auf der Grundlage der Gestaltanalyse.
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und ähnlicher
Verfahren als freie Software im CPAN (Comprehensive Perl Archive Network)
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Encode letter by letter from left to right according to the conversion table.
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Aspekte der
Kodierung phonetischer Ähnlichkeiten in deutschen Eigennamen
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Collapse of all multiple consecutive code digits: 6050750206802
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Remove all digits occurring more than once next to each other.
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in initial position except before A, H, K, L, O, Q, R, U, X
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in the initial sound before A, H, K, L, O, Q, R, U, X
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in: IBM-Nachrichten, 19. Jahrgang, 1969, S. 925-931.
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312:Processing of a word is done in three steps:
210:before A, H, K, O, Q, U, X except after S, Z
85:(also Kölner Phonetik, Cologne process) is a
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322:Remove all code "0" except at the beginning.
392:Perl-Implementierung der Kölner Phonetik
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406:PHP-Implementation der Kölner Phonetik
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399:PHP und Oracle PL/SQL-Implementierung
339:Encode each letter: 60550750206880022
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408:in einem Kommentar zum Eintrag
345:Remove all "0" digits: 65752682
279:not before A, H, K, O, Q, U, X
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335:will be coded as follows:
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354:Hans Joachim Postel:
412:im PHP-Manual, 2008.
426:Phonetic algorithms
401:der Kölner Phonetik
333:Müller-Lüdenscheidt
303:"except after S, Z"
125:A, E, I, J, O, U, Y
166:not before C, S, Z
87:phonetic algorithm
23:Phonetic algorithm
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218:not after C, K, Q
83:Cologne phonetics
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72:space complexity
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59:performance
46:performance
33:performance
350:Literature
69:Worst-case
30:Worst-case
368:Metaphone
331:The name
187:before H
107:Procedure
43:Best-case
420:Category
362:See also
410:soundex
327:Example
192:G, K, Q
174:F, V, W
117:Context
92:Soundex
56:Average
114:Letter
98:Method
120:Code
19:Class
385:Perl
284:D, T
256:S, Z
236:M, N
163:D, T
76:O(N)
63:O(N)
50:O(N)
37:O(N)
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422::
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150:1
140:-
130:0
387:.
292:X
266:C
246:R
226:L
215:X
202:C
184:P
155:P
145:B
135:H
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