<s>
A	O
phonetic	B-Algorithm
algorithm	I-Algorithm
is	O
an	O
algorithm	O
for	O
indexing	O
of	O
words	O
by	O
their	O
pronunciation	O
.	O
</s>
<s>
Most	O
phonetic	B-Algorithm
algorithms	I-Algorithm
were	O
developed	O
for	O
English	O
and	O
are	O
not	O
useful	O
for	O
indexing	O
words	O
in	O
other	O
languages	O
.	O
</s>
<s>
Because	O
English	O
spelling	O
varies	O
significantly	O
depending	O
on	O
multiple	O
factors	O
,	O
such	O
as	O
the	O
word	O
's	O
origin	O
and	O
usage	O
over	O
time	O
and	O
borrowings	O
from	O
other	O
languages	O
,	O
phonetic	B-Algorithm
algorithms	I-Algorithm
necessarily	O
take	O
into	O
account	O
numerous	O
rules	O
and	O
exceptions	O
.	O
</s>
<s>
Among	O
the	O
best-known	O
phonetic	B-Algorithm
algorithms	I-Algorithm
are	O
:	O
</s>
<s>
Soundex	B-Algorithm
,	O
which	O
was	O
developed	O
to	O
encode	O
surnames	O
for	O
use	O
in	O
censuses	O
.	O
</s>
<s>
Soundex	B-Algorithm
codes	I-Algorithm
are	O
four-character	O
strings	O
composed	O
of	O
a	O
single	O
letter	O
followed	O
by	O
three	O
numbers	O
.	O
</s>
<s>
Daitch	B-Algorithm
–	I-Algorithm
Mokotoff	I-Algorithm
Soundex	I-Algorithm
,	O
which	O
is	O
a	O
refinement	O
of	O
Soundex	B-Algorithm
designed	O
to	O
better	O
match	O
surnames	O
of	O
Slavic	O
and	O
Germanic	O
origin	O
.	O
</s>
<s>
Daitch	B-Algorithm
–	I-Algorithm
Mokotoff	I-Algorithm
Soundex	I-Algorithm
codes	O
are	O
strings	O
composed	O
of	O
six	O
numeric	O
digits	O
.	O
</s>
<s>
Cologne	B-Algorithm
phonetics	I-Algorithm
:	O
This	O
is	O
similar	O
to	O
Soundex	B-Algorithm
,	O
but	O
more	O
suitable	O
for	O
German	O
words	O
.	O
</s>
<s>
Metaphone	B-Algorithm
and	O
Double	O
Metaphone	B-Algorithm
which	O
are	O
suitable	O
for	O
use	O
with	O
most	O
English	O
words	O
,	O
not	O
just	O
names	O
.	O
</s>
<s>
Metaphone	B-Algorithm
algorithms	O
are	O
the	O
basis	O
for	O
many	O
popular	O
spell	B-Application
checkers	I-Application
.	O
</s>
<s>
New	B-Algorithm
York	I-Algorithm
State	I-Algorithm
Identification	I-Algorithm
and	I-Algorithm
Intelligence	I-Algorithm
System	I-Algorithm
(	O
NYSIIS	B-Algorithm
)	O
,	O
which	O
maps	O
similar	O
phonemes	B-Language
to	O
the	O
same	O
letter	O
.	O
</s>
<s>
Match	B-Algorithm
Rating	I-Algorithm
Approach	I-Algorithm
developed	O
by	O
Western	O
Airlines	O
in	O
1977	O
-	O
this	O
algorithm	O
has	O
an	O
encoding	O
and	O
range	O
comparison	O
technique	O
.	O
</s>
<s>
Caverphone	B-Algorithm
,	O
created	O
to	O
assist	O
in	O
data	O
matching	O
between	O
late	O
19th	O
century	O
and	O
early	O
20th	O
century	O
electoral	O
rolls	O
,	O
optimized	O
for	O
accents	O
present	O
in	O
parts	O
of	O
New	O
Zealand	O
.	O
</s>
<s>
Spell	B-Application
checkers	I-Application
can	O
often	O
contain	O
phonetic	B-Algorithm
algorithms	I-Algorithm
.	O
</s>
<s>
The	O
Metaphone	B-Algorithm
algorithm	O
,	O
for	O
example	O
,	O
can	O
take	O
an	O
incorrectly	O
spelled	O
word	O
and	O
create	O
a	O
code	O
.	O
</s>
<s>
The	O
code	O
is	O
then	O
looked	O
up	O
in	O
directory	O
for	O
words	O
with	O
the	O
same	O
or	O
similar	O
Metaphone	B-Algorithm
.	O
</s>
<s>
Words	O
that	O
have	O
the	O
same	O
or	O
similar	O
Metaphone	B-Algorithm
become	O
possible	O
alternative	O
spellings	O
.	O
</s>
<s>
Search	B-Application
functionality	O
will	O
often	O
use	O
phonetic	B-Algorithm
algorithms	I-Algorithm
to	O
find	O
results	O
that	O
do	O
n't	O
match	O
exactly	O
the	O
term(s )	O
used	O
in	O
the	O
search	B-Application
.	O
</s>
<s>
Using	O
Soundex	B-Algorithm
all	O
three	O
variations	O
produce	O
the	O
same	O
Soundex	B-Algorithm
code	I-Algorithm
,	O
C460	O
.	O
</s>
<s>
By	O
searching	O
names	O
based	O
on	O
the	O
Soundex	B-Algorithm
code	I-Algorithm
all	O
three	O
variations	O
will	O
be	O
returned	O
.	O
</s>
