[R] waveform filtering

[Huntsinger, Reid]

You should probably have a look at the sound packages for R, "tuneR" and
"sound", I believe, on http://cran.r-project.org. 

Applying a filter can be done with filter(), but you need to come up with
filter coefficients. "High-pass" and "low-pass" have simple descriptions in
the Fourier transform space, so you might want to specify the frequency
response of your filter directly there, then do an inverse Fourier transform
(fft() in R) to get coefficients. 

The ingredients are all there in R itself; but the packages tuneR and sound
might have exactly what you want. A book on time series or signal processing
might be helpful.

Reid Huntsinger

-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of tom wright
Sent: Monday, September 19, 2005 10:36 AM
To: R-help mailing list
Subject: [R] waveform filtering


I'm not an engineer so I hope I'm using the correct terminology here. I
have a recorded waveform that I want to apply low and high pass filters
too, are tehre already R functions existing to do this or am I going to
have to program my own?
thanks for any pointers
tom

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