<s>
Pulse	O
shapes	O
can	O
arise	O
out	O
of	O
a	O
process	O
called	O
pulse-shaping	B-Algorithm
.	O
</s>
<s>
A	O
digital	B-Application
timing	I-Application
diagram	I-Application
is	O
an	O
example	O
of	O
a	O
well-ordered	O
collection	O
of	O
rectangular	O
pulses	O
.	O
</s>
<s>
An	O
example	O
of	O
a	O
pulse	O
which	O
meets	O
this	O
condition	O
is	O
the	O
sinc	B-Algorithm
function	I-Algorithm
.	O
</s>
<s>
The	O
sinc	B-Algorithm
pulse	I-Algorithm
is	O
of	O
some	O
significance	O
in	O
signal-processing	O
theory	O
but	O
cannot	O
be	O
produced	O
by	O
a	O
real	O
generator	O
for	O
reasons	O
of	O
causality	O
.	O
</s>
