<s>
Phonetic	B-General_Concept
Search	I-General_Concept
Technology	I-General_Concept
(	O
PST	O
)	O
is	O
a	O
method	O
of	O
speech	B-Application
recognition	I-Application
.	O
</s>
<s>
An	O
audio	O
signal	O
of	O
speech	O
is	O
broken	O
down	O
into	O
series	O
of	O
phonemes	B-Language
,	O
which	O
can	O
be	O
used	O
to	O
identify	O
words	O
.	O
</s>
<s>
A	O
string	O
of	O
six	O
phonemes	B-Language
for	O
example	O
,	O
“	O
_B	O
_IY	O
_T	O
_UW	O
_B	O
_IY	O
,	O
”	O
represent	O
the	O
acronym	O
“	O
B2B	O
”	O
.	O
</s>
