<s>
Search	B-Application
by	I-Application
sound	I-Application
is	O
the	O
retrieval	O
of	O
information	O
based	O
on	O
audio	O
input	O
.	O
</s>
<s>
There	O
are	O
a	O
handful	O
of	O
applications	O
,	O
specifically	O
for	O
mobile	O
devices	O
that	O
utilize	O
search	B-Application
by	I-Application
sound	I-Application
.	O
</s>
<s>
Shazam	B-Application
(	O
service	O
)	O
,	O
Soundhound	B-Application
(	O
previously	O
Midomi	B-Application
)	O
,	O
Axwave	O
,	O
ACRCloud	O
and	O
others	O
have	O
seen	O
considerable	O
success	O
by	O
using	O
a	O
simple	O
algorithm	O
to	O
match	O
an	O
acoustic	B-Algorithm
fingerprint	I-Algorithm
to	O
a	O
song	O
in	O
a	O
library	O
.	O
</s>
<s>
Searching	O
by	O
sound	O
is	O
not	O
limited	O
to	O
just	O
identifying	O
songs	O
,	O
but	O
also	O
for	O
identifying	O
melodies	O
,	O
tunes	O
or	O
advertisements	O
,	O
sound	O
library	O
management	O
and	O
video	B-General_Concept
files	I-General_Concept
.	O
</s>
<s>
The	O
way	O
these	O
apps	O
search	B-Application
by	I-Application
sound	I-Application
is	O
through	O
generating	O
an	O
acoustic	B-Algorithm
fingerprint	I-Algorithm
;	O
a	O
digital	O
summary	O
of	O
the	O
sound	O
.	O
</s>
<s>
Using	O
the	O
same	O
method	O
of	O
fingerprinting	O
sounds	O
,	O
when	O
Shazam	B-Application
picks	O
up	O
a	O
sound	O
clip	O
,	O
it	O
will	O
generate	O
a	O
signature	O
for	O
that	O
clip	O
.	O
</s>
<s>
The	O
practice	O
of	O
using	O
acoustic	B-Algorithm
fingerprints	I-Algorithm
is	O
not	O
limited	O
to	O
just	O
music	O
,	O
however	O
,	O
but	O
other	O
areas	O
of	O
the	O
entertainment	O
business	O
as	O
well	O
.	O
</s>
<s>
Shazam	B-Application
also	O
can	O
identify	O
television	O
shows	O
with	O
the	O
same	O
technique	O
of	O
acoustic	B-Algorithm
fingerprinting	I-Algorithm
.	O
</s>
<s>
Shazam	B-Application
has	O
over	O
11	O
million	O
songs	O
in	O
its	O
database	O
.	O
</s>
<s>
Other	O
services	O
such	O
as	O
Midomi	B-Application
and	O
Soundhound	B-Application
allow	O
users	O
to	O
add	O
to	O
that	O
library	O
of	O
music	O
in	O
order	O
to	O
expand	O
the	O
chances	O
to	O
match	O
a	O
sound	O
sample	O
with	O
its	O
corresponding	O
sound	O
.	O
</s>
<s>
Midomi	B-Application
and	O
Soundhound	B-Application
both	O
offer	O
query	B-Application
by	I-Application
humming	I-Application
.	O
</s>
<s>
This	O
is	O
a	O
branch	O
off	O
of	O
acoustic	B-Algorithm
fingerprints	I-Algorithm
but	O
is	O
still	O
a	O
musical	O
retrieval	O
system	O
.	O
</s>
