<s>
In	O
signal	O
processing	O
and	O
telecommunication	O
,	O
pulse	B-Algorithm
duration	I-Algorithm
is	O
the	O
interval	O
between	O
the	O
time	O
,	O
during	O
the	O
first	O
transition	O
,	O
that	O
the	O
amplitude	B-Application
of	O
the	O
pulse	B-Algorithm
reaches	O
a	O
specified	O
fraction	O
(	O
level	O
)	O
of	O
its	O
final	O
amplitude	B-Application
,	O
and	O
the	O
time	O
the	O
pulse	B-Algorithm
amplitude	B-Application
drops	O
,	O
on	O
the	O
last	O
transition	O
,	O
to	O
the	O
same	O
level	O
.	O
</s>
<s>
The	O
interval	O
between	O
the	O
50%	O
points	O
of	O
the	O
final	O
amplitude	B-Application
is	O
usually	O
used	O
to	O
determine	O
or	O
define	O
pulse	B-Algorithm
duration	I-Algorithm
,	O
and	O
this	O
is	O
understood	O
to	O
be	O
the	O
case	O
unless	O
otherwise	O
specified	O
.	O
</s>
<s>
Other	O
fractions	O
of	O
the	O
final	O
amplitude	B-Application
,	O
e.g.	O
,	O
90%	O
or	O
1/e	O
,	O
may	O
also	O
be	O
used	O
,	O
as	O
may	O
the	O
root	B-General_Concept
mean	I-General_Concept
square	I-General_Concept
(	O
rms	O
)	O
value	O
of	O
the	O
pulse	B-Algorithm
amplitude	B-Application
.	O
</s>
<s>
In	O
radar	B-Application
,	O
the	O
pulse	B-Algorithm
duration	I-Algorithm
is	O
the	O
time	O
the	O
radar	B-Application
's	O
transmitter	O
is	O
energized	O
during	O
each	O
cycle	O
.	O
</s>
