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an audio spectrum visualizer using FFT of a set of parametric filters on a log
sine sweep 20 - 22050 Hz, 2^15 samples. The resolution in the low end is low and
wavey. The result is normalized.
The filters:
//ini_filter(peak(dB), Freq(Hz), bandwidth(Hz), samplerate)
#declare band4000 = init_filter(+6, 4000, 520, sampleRate);
#declare band1000 = init_filter(+3, 1000, 520, sampleRate);
#declare band500 = init_filter(-9, 500, 100, sampleRate);
#declare band200 = init_filter(-5, 200, 150, sampleRate);
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Attachments:
Download 'parametric7.png' (17 KB)
Preview of image 'parametric7.png'
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"ingo" <nomail@nomail> wrote:
> an audio spectrum visualizer using FFT of a set of parametric filters on a log
> sine sweep 20 - 22050 Hz, 2^15 samples. The resolution in the low end is low and
> wavey. The result is normalized.
>
> The filters:
>
> //ini_filter(peak(dB), Freq(Hz), bandwidth(Hz), samplerate)
>
> #declare band4000 = init_filter(+6, 4000, 520, sampleRate);
> #declare band1000 = init_filter(+3, 1000, 520, sampleRate);
> #declare band500 = init_filter(-9, 500, 100, sampleRate);
> #declare band200 = init_filter(-5, 200, 150, sampleRate);
Cool!! Using POV!? Like to see the code.
It's been awhile since I played with audio on POV. Audacity has a sampling
function that lets you get and place sound data. Can't remember all the stuff I
did, but I mostly played with wave forms.
Have Fun!
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"Leroy" <whe### [at] gmail com> wrote:
> Cool!! Using POV!? Like to see the code.
Yes, all in POV-Ray, signal generation, FFT, audio recording.
The code will take some time, I'm redoing the include files I made a few years
ago and make a consistent set of it. Currently there is recording to wav file,
oscillators, bandlimited ones, Low frequency oscillators using look up tables.
Biquad filters, a 3-band EQ and a single band EQ to build a parametric EQ with.
ADSR with visualisation. Waveform visualisation. Currently working on
"welchFFT", applying windows to the data and then use overlapping FFT.
Once done, it will be posted.
ingo
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