<s>
A	O
harmonic	B-Algorithm
spectrum	I-Algorithm
is	O
a	O
spectrum	O
containing	O
only	O
frequency	O
components	O
whose	O
frequencies	O
are	O
whole	O
number	O
multiples	O
of	O
the	O
fundamental	O
frequency	O
;	O
such	O
frequencies	O
are	O
known	O
as	O
harmonics	O
.	O
</s>
<s>
A	O
standard	O
result	O
of	O
Fourier	O
analysis	O
is	O
that	O
a	O
function	O
has	O
a	O
harmonic	B-Algorithm
spectrum	I-Algorithm
if	O
and	O
only	O
if	O
it	O
is	O
periodic	O
.	O
</s>
