# [PD] dsp lowest frequency?

Bosko Milakovic bmilakovic at hotmail.com
Wed May 9 11:18:04 CEST 2007

```Thanks Roman and Marius.

>From: Roman Haefeli <reduzierer at yahoo.de>
>To: Bosko Milakovic <bmilakovic at hotmail.com>
>CC: pd-list at iem.at
>Subject: Re: [PD] dsp lowest frequency?
>Date: Tue, 08 May 2007 18:21:10 +0200
>
>dc is always the lowest possible frequency, no matter what sr you use.
>the issue with nyquist frequency is, that if the frequency of a signal
>is too high (>sr/2), then it doesn't 'fit' into the sample-grid anymore.
>the only 'limitation' for low frequencies is, that you cannot tell the
>exact frequency, if your samplefile is too short. let's say, the period
>of your frequency is 10s, but your sample is only 5s long. how can you
>tell, that the signal has a frequency of 1/10 = 0.1Hz?
>
>roman
>
>On Tue, 2007-05-08 at 15:43 +0000, Bosko Milakovic wrote:
> > Hi all!
> >
> > Maybe it's a stupid question but I was reading this
> > http://www.dspdimension.com/PDF/DftAPied.pdf and it confused me a bit.
> > Theoretically, if we have a sample rate at 1000Hz, the highest possible
> > pitch will be 500Hz. But is there an opposite limit? Is there a "lowest
> > possible pitch" for different sample rates? Is DC always there no matter
> > what SR is or the lowest frequency boundary is moving also?
> >
> > Bosko
> >
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