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Heterodyne Filters
Use
heterodyning
to implement a
sweepable
filter
using a
fixed
lowpass filter
and heterodyning
Heterodyning is multiplication by a complex
sinusoid
tuned to the ``sweep frequency''
The fixed filter's
bandwidth
is a bandwidth control
Requires
analytic
input
signal
(
i.e.
, first filter out
negative frequencies
)
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Download
VariableFilters.pdf
Download
VariableFilters_2up.pdf
Download
VariableFilters_4up.pdf
``
Variable Digital Filters
'', by
Tim Stilson
and
Julius O. Smith III
, (From Lecture Overheads,
Music 420
).
Copyright ©
2019-02-05
by
Tim Stilson
and
Julius O. Smith III
Center for Computer Research in Music and Acoustics (CCRMA),
Stanford University
[Automatic-links disclaimer]