[squeak-dev] Squeak and Sound
David T. Lewis
lewis at mail.msen.com
Wed Jan 13 22:24:58 UTC 2021
On Wed, Jan 13, 2021 at 10:48:30AM -0800, tim Rowledge wrote:
> > On 2021-01-13, at 10:10 AM, Peter Crowther <peter at ozzard.org> wrote:
> > On Tue, 12 Jan 2021 at 19:08, tim Rowledge <tim at rowledge.org> wrote:
> > > I'm not a piano player, but, what I vaguly remember as middle C does not seem to be middle C and the lower third of the keyboard seems silent though probably because the frequency is too low.
> > The claimed middle C is set to 440Hz, which I'm fairly sure is correct. It sound about right to me when played but I am not a musician.
> > If true, you're a sixth high. You want A440 to be the A above middle C. C isn't far off 256Hz (though don't use that as a reference!)
> You're right. I did point out I'm not a player...
> AbstractSound sets middle C to 261.6265Hz, which agrees with https://en.wikipedia.org/wiki/Piano_key_frequencies I guess an interesting question is whether anyone has both an oscilloscope and a Squeak system to compare and validate?
Here is another handy reference: http://newt.phys.unsw.edu.au/jw/notes.html
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