winsound.Beep() frequencies

[Bengt Richter]

On 3 Sep 2002 13:29:23 -0700, megabytemonster at hotmail.com (Stuart) wrote:

>While looking at the python documentation, I noticed that there are no
>frequency/pitch tables for using with the winsound module.  Does
>anyone know whether this documentation exists, and/or what the
>corresponding frequencies to pitches are?
>
Well, 440 hz is an A, I believe. And an octave is a factor of 2.
But I believe the best sounding scale will not have 12 equal ratios
of 2**(1/12).

Google is your friend...

    http://ccrma-www.stanford.edu/CCRMA/Courses/220a/unjung/wellScale.html

(this table does appear to be based on equal ratios).

... which is easy to compute with Python:

 >>> notes = 'A Bb B C Db D Eb E F Gb G Ab'.split()
 >>> notes
 ['A', 'Bb', 'B', 'C', 'Db', 'D', 'Eb', 'E', 'F', 'Gb', 'G', 'Ab']
 >>> def noteFreq(name, oct):
 ...     return (27.5*2**oct)*2.0**(notes.index(name)/12.)
 ...
 >>> noteFreq('A',4)
 440.0
 >>> noteFreq('F',2)
 174.61411571650194
 >>> noteFreq('C',4)
 523.25113060119725
 >>> noteFreq('A',0)
 27.5
 >>> noteFreq('Ab',7)
 6644.875161279122


Here's more. Careful, it's easy to get interested ;-)

    http://www.organicdesign.org/peterson/tuning/

Regards,
Bengt Richter