Help needed with waveform audio stuff

[Siekmanski]

 

You want to play a sine wave by hitting a key right ?
You could also do that using DirectSound filling a sound buffer with a sine wave and play that buffer with the frequency you need and as long as you want just like a morse key.

[dedndave]

i get that
and i can do it with MIDI, too
but a solid beep turning off and on is very brash - a clickish sound to it
for nice morse, the wave shape attack and decay need to be shaped a little bit
something i can do easier with WAV

this one is probably a little too soft on attack and a little too stiff on decay, but you get the idea...

[Siekmanski]

If you create a sine wave starting and ending at zero there's no click.
There are 2 ways to play a sample, looping and one shot.
With one shot you can shape the sample the way you want without a clicking sound.
I'm now curious if you stop a perfect sine wave at once you will hear a click.
I'll test this....

[dedndave]

another image
again, a little too soft on attack, but the decay looks better than the other one

[Siekmanski]

I made a small test.

Removed attachment, see Reply #21.

[dedndave]

nice - but seems a bit harsh
i don't understand the code - lol
i generally use a sidetone of about 750 Hz, though

need a storage scope to examine the modulation envelope   :(
is it just me, or is the envelope different on different keypresses ?

[Siekmanski]

Yes Dave, you were right it was a bad example.  :redface:
I shouldn't code anymore late at night. 

Now with a correct 750 Hz sine wave with adjustable attack and decay.

edit: minor correction

[dedndave]

very cool - give me some time to play...

thanks, Marinus   :t

not as easy as it sounds - lol
the same is true if you are trying to make a nice code practice oscillator   
takes a lot of circuitry to make it sound right

[Siekmanski]

Especially when you want to have a nice and clean sinus without spurs.  :t