[GreenKeys] 1khz reference tone...

[Ethan Blanton]

Jeffrey D Angus wrote:
> On 6/6/2017 8:54 AM, kn7sfz wrote:
> >
> >Plenty of pure tone generators online....here's one:
> >
> >http://www.szynalski.com/tone-generator/
>
> Nice, but it says nothing about the accuracy of the tone.

It really can't.  Software-generated tones are limited in accuracy by
1) your sound card's DAC clock accuracy (probably pretty poor), and 2)
artifacts created by interactions between sampling frequency and tone
frequency (probably irrelevant for your purposes).

It's very easy to numerically create a "perfect" sine wave in
software, modulo the above limitations.  This software probably does.
I haven't used it, but I'd assume any programmer worth his salt can
create a suitable tone.  What happens to it after that is more or less
out of the software's hands.

All of that said, you can rest assured that the tone generated by your
computer sound card is better than any but lab-grade AF generators,
because they either suffer from very similar limitations if they are
digital, or are limited to whatever cheap uncalibrated AF oscillator
they have if they are analog.

Ethan