<s>
An	O
audio	B-Application
search	I-Application
engine	I-Application
is	O
a	O
web-based	O
search	B-Application
engine	I-Application
which	O
crawls	B-Application
the	O
web	O
for	O
audio	O
content	O
.	O
</s>
<s>
Text	O
entered	O
into	O
a	O
search	O
bar	O
by	O
the	O
user	O
is	O
compared	O
to	O
the	O
search	B-Application
engine	I-Application
's	O
database	O
.	O
</s>
<s>
The	O
Query	B-Application
by	I-Application
Example	I-Application
(	O
QBE	O
)	O
system	O
is	O
a	O
searching	O
algorithm	O
that	O
uses	O
content-based	B-Application
image	I-Application
retrieval	I-Application
(	O
CBIR	B-Application
)	O
.	O
</s>
<s>
In	O
audio	B-Application
search	I-Application
from	I-Application
audio	I-Application
,	O
the	O
user	O
must	O
play	O
the	O
audio	O
of	O
a	O
song	O
either	O
with	O
a	O
music	O
player	O
,	O
by	O
singing	O
or	O
by	B-Application
humming	I-Application
to	O
the	O
computer	O
microphone	O
.	O
</s>
<s>
Subsequently	O
,	O
a	O
sound	O
pattern	O
,	O
A	O
,	O
is	O
derived	O
from	O
the	O
audio	O
waveform	O
,	O
and	O
a	O
frequency	O
representation	O
is	O
derived	O
from	O
its	O
Fourier	B-Algorithm
Transform	I-Algorithm
.	O
</s>
<s>
Audio	B-Application
search	I-Application
has	O
evolved	O
slowly	O
through	O
several	O
basic	O
search	O
formats	O
which	O
exist	O
today	O
and	O
all	O
use	O
keywords	O
.	O
</s>
<s>
Some	O
search	B-Application
engines	I-Application
can	O
search	O
recorded	O
speech	O
such	O
as	O
podcasts	O
,	O
though	O
this	O
can	O
be	O
difficult	O
if	O
there	O
is	O
background	O
noise	O
.	O
</s>
<s>
Around	O
40	O
phonemes	B-Language
exist	O
in	O
every	O
language	O
with	O
about	O
400	O
in	O
all	O
spoken	O
languages	O
.	O
</s>
<s>
Applications	O
as	O
Munax	B-Application
,	O
use	O
several	O
independent	O
ranking	O
algorithms	O
processes	O
,	O
that	O
the	O
inverted	B-Algorithm
index	I-Algorithm
together	O
with	O
hundreds	O
of	O
search	O
parameters	O
to	O
produce	O
the	O
final	O
ranking	O
for	O
each	O
document	O
.	O
</s>
<s>
Also	O
like	O
Shazam	B-Application
that	O
works	O
by	O
analyzing	O
the	O
captured	O
sound	O
and	O
seeking	O
a	O
match	O
based	O
on	O
an	O
acoustic	B-Algorithm
fingerprint	I-Algorithm
in	O
a	O
database	O
of	O
more	O
than	O
11	O
million	O
songs	O
.	O
</s>
<s>
Shazam	B-Application
identifies	O
songs	O
based	O
on	O
an	O
audio	B-Algorithm
fingerprint	I-Algorithm
based	O
on	O
a	O
time-frequency	O
graph	O
called	O
a	O
spectrogram	O
.	O
</s>
<s>
Shazam	B-Application
stores	O
a	O
catalogue	O
of	O
audio	B-Algorithm
fingerprints	I-Algorithm
in	O
a	O
database	O
.	O
</s>
<s>
The	O
user	O
tags	O
a	O
song	O
for	O
10	O
seconds	O
and	O
the	O
application	O
creates	O
an	O
audio	B-Algorithm
fingerprint	I-Algorithm
.	O
</s>
<s>
Once	O
it	O
creates	O
the	O
fingerprint	O
of	O
the	O
audio	O
,	O
Shazam	B-Application
starts	O
the	O
search	O
for	O
matches	O
in	O
the	O
database	O
.	O
</s>
<s>
Shazam	B-Application
can	O
identify	O
prerecorded	O
music	O
being	O
broadcast	O
from	O
any	O
source	O
,	O
such	O
as	O
a	O
radio	O
,	O
television	O
,	O
cinema	O
or	O
music	O
in	O
a	O
club	O
,	O
provided	O
that	O
the	O
background	O
noise	O
level	O
is	O
not	O
high	O
enough	O
to	O
prevent	O
an	O
acoustic	B-Algorithm
fingerprint	I-Algorithm
being	O
taken	O
,	O
and	O
that	O
the	O
song	O
is	O
present	O
in	O
the	O
software	O
's	O
database	O
.	O
</s>
<s>
Picsearch	B-General_Concept
Audio	B-Application
Search	I-Application
has	O
been	O
licensed	O
to	O
search	B-Application
portals	I-Application
since	O
2006	O
.	O
</s>
<s>
Picsearch	B-General_Concept
is	O
a	O
search	O
technology	O
provider	O
who	O
powers	O
image	O
,	O
video	O
and	O
audio	B-Application
search	I-Application
for	O
over	O
100	O
major	O
search	B-Application
engines	I-Application
around	O
the	O
world	O
.	O
</s>
<s>
SoundHound	B-Application
(	O
previously	O
known	O
as	O
Midomi	B-Application
)	O
is	O
a	O
software	O
and	O
company	O
(	O
both	O
with	O
the	O
same	O
name	O
)	O
that	O
lets	O
users	O
find	O
results	O
with	O
audio	O
.	O
</s>
<s>
Its	O
features	O
are	O
both	O
an	O
audio-based	O
artificial	B-Application
intelligence	I-Application
service	O
and	O
services	O
to	O
find	O
songs	O
and	O
details	O
about	O
them	O
by	O
singing	O
,	O
humming	O
or	O
recording	O
them	O
.	O
</s>
<s>
Shazam	B-Application
is	O
an	O
app	O
for	O
smartphone	O
or	O
Mac	O
best	O
known	O
for	O
its	O
music	B-Algorithm
identification	I-Algorithm
capabilities	O
.	O
</s>
<s>
It	O
creates	O
an	O
acoustic	B-Algorithm
fingerprint	I-Algorithm
based	O
on	O
the	O
sample	O
,	O
and	O
compares	O
it	O
against	O
a	O
central	O
database	O
for	O
a	O
match	O
.	O
</s>
<s>
Doreso	B-Application
identifies	O
a	O
song	O
by	B-Application
humming	I-Application
or	O
singing	O
the	O
melody	O
using	O
a	O
microphone	O
;	O
and	O
by	O
direct	O
input	O
of	O
the	O
name	O
of	O
a	O
song	O
or	O
singer	O
.	O
</s>
<s>
Munax	B-Application
(	O
defunct	O
)	O
is	O
a	O
company	O
that	O
released	O
their	O
all-content	O
search	B-Application
engine	I-Application
in	O
its	O
first	O
version	O
in	O
2005	O
.	O
</s>
<s>
Their	O
PlayAudioVideo	B-Application
multimedia	O
search	B-Application
engine	I-Application
,	O
created	O
in	O
July	O
2007	O
,	O
was	O
the	O
first	O
true	O
search	B-Application
engine	I-Application
for	O
multimedia	O
,	O
providing	O
search	O
on	O
the	O
web	O
for	O
images	O
,	O
video	O
and	O
audio	O
in	O
the	O
same	O
search	B-Application
engine	I-Application
,	O
and	O
allowing	O
users	O
to	O
preview	O
them	O
on	O
the	O
same	O
page	O
.	O
</s>
<s>
Munax	B-Application
has	O
since	O
shut	O
down	O
.	O
</s>
