<s>
A	O
phase	B-Algorithm
detector	I-Algorithm
characteristic	I-Algorithm
is	O
a	O
function	O
of	O
phase	O
difference	O
describing	O
the	O
output	O
of	O
the	O
phase	O
detector	O
.	O
</s>
<s>
Here	O
and	O
denote	O
high-frequency	O
signals	O
,	O
piecewise	B-Algorithm
differentiable	I-Algorithm
functions	O
,	O
represent	O
waveforms	O
of	O
input	O
signals	O
,	O
denote	O
phases	O
,	O
and	O
denotes	O
the	O
output	O
of	O
the	O
filter	O
.	O
</s>
<s>
Consider	O
general	O
case	O
of	O
piecewise-differentiable	O
waveforms	O
,	O
.	O
</s>
