Guitar Tuner app probs with using /dev/dsp on 2.6.28
andy at openmoko.com
Tue Jan 27 17:20:51 CET 2009
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Somebody in the thread at some point said:
| HSP. Also, I think I need a low pass filter. Can someone point me in the
| right direction?
Biquad filters are cheap and simple to do as integer and they're
flexible. There's a generic float implementation here:
but you can see the funky stuff is done on filter init and is constant
for a given samplerate and filter cutoff, so that also becomes easy to
do in integer if they are constant.
| The FFT should be fine since I'm using FFTW. But, can that be made
| (in performance if nothing else)?
| Any other suggestions for the UI/anything else are also welcome.
| The code is available
| http://www.opkg.org/guitartune.projects.openmoko.org here and at
Link seems broken.
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