[R] waveform filtering

[Uwe Ligges]

Huntsinger, Reid wrote:

> 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

Unfortunately, methods for filtering are neither in sound nor in tuneR 
(yet). Contributions are welcome, of course!

Uwe Ligges


> 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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