* Steve Holden:
Alf P. Steinbach wrote:
Just as a contribution, since someone hinted that I haven't really
contributed much to the Python community.
The [simple_sound] code will probably go into my ch 3 at <url:
http://tinyurl.com/programmingbookP3>, but sans sine wave generation
since I haven't yet discussed trig functions, and maybe /with/ changes
suggested by you?
I wouldn't hold back on the sine wave just because it would represent a
"forward reference". That's OK sometimes. Why not just put a comment in
to the effect that "The sine wave is created using a function from the
math module, which we'll be looking at in ..."?
Since the sine is the basis for all other waveforms its omission would
seem more than a little strange to anyone knowledgeable about audio, for
example.
I don't know very much if anything about audio. For example, in the code what I
called "sawtooth" wave is really "triangle" wave. The sawtooth is simpler, what
I called "linear" in the code.
And if you wonder, I was just checking the terminology now before starting to
write it up... Perhaps should have done that before posting code. But once I got
the idea of posting it I just posted it.
Anyway, as I recall any wave can be decomposed into sine waves, or square waves,
or almost whatever kind of waves. Think about a square wave of frequency f and
one of frequency 3f and perhaps third the amplitude (not sure), combined that's
already a good start on a sine wave. With some ugly staircasing but hey. And as
a matter of programming practicality, a triangle wave sounds almost like a sine
wave. It's just a little more edgy or "hairy", a slight buzz.
Cheers,
- Alf
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