[sdiy] Software to log frequency every x seconds?

[Grant Richter]

Why would you want to log frequency for a musical oscillator?

A cent is 1/100 of a semitone, there are 1200 cents in an octave.

For example, in the lowest octave 20Hz to 40 Hz, 20/1200 = 0.016Hz  
per cent
In the highest octave 10kHz to 20 kHz, 20000/1200 = 16.66 Hz per cent

As you can see, frequency doesn't tell you much about pitch.
And they are not the same thing.

Have you considered using a chromatic tuner with an analog needle  
indicator and just video tape it?

On Oct 3, 2007, at 5:00 AM, Derek Holzer wrote:

> Most computer frequency analysis programs aren't simply comparing  
> the input frequency to a crystal. Often they are using Fast Fourier  
> Transformation analysis, which means that the signal is being  
> chopped into tiny "windows" and these windows are then checked for  
> their individual sinusoidal components. In each window, you have a  
> "bar", or "bin", which represents each of the sinusoids it will  
> look for (power of two numbers, i.e. 256, 512, 1024, 2048, 8192,  
> 16384, etc etc). Higher frequency resolution means less accurate  
> time resolution, and vice-versa, but in general the results you get  
> from FFT are very reliable.
>
> FFT for Dummies: http://www.vlf.it/fft_beginners/fft_beginners.html
>
> One of the more ideal softwares for what you want to do is called  
> Baudline:
>
> http://www.baudline.com/
>
> However it's Linux only at the moment. You might Google around for  
> a good spectrum analyzer/spectrum analysis software for your  
> platform of choice. Many will have the ability to record the FFT  
> data over time so you can see drift. Perhaps some other list  
> members have favorites already...
>
> best,
> derek
>
> -- 
> derek holzer ::: http://www.umatic.nl ::: http://blog.myspace.com/ 
> macumbista
> ---Oblique Strategy # 139:
> "Revaluation (a warm feeling)"
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