Hi!
My name is Mikael, and I am a scientist/engineer working
with acoustics. I
have used Audacity a lot for mixing sounds of different
kinds, but have
used other proprietary software for analysis such as
A-weighted levels,
octave band levels and so on. But I have realized that using
a Nyquist
plug-in such an analysis would be a simple thing to add to
Audacity.
However, I quickly reached the point were I got stuck, and
hence I’m
sending this mail to ask for help.
I would like to filter a signal in my Nyquist plugin with a
set of digital
filter coefficients (often called “a” and “b” coefficients).
This must be
possible in Nyquist, since all the filters use this
approach, but I have
found no way of directly giving values for the coefficients
a and b. All I
can find in the Nyquist documentation and the source code of
other
plug-ins is filter functions where you give transition
frequencies and
such, and then the low level stuff including calculating the
coefficients
gets done automagically.
Beeing more specific: I have two different filters I would
like to
implement, one being the A-weighting filter (see
http://en.wi
kipedia.org/wiki/A-weighting). I have made a bilinear
approximation which uses five “a” and seven “b”
coefficients, how can I
filter a signal with these home-made coefficients in
Nyquist?
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