Bill & Pookie wrote:
> are you asking about the internal speaker of the pc that makes tones or the
> output of the sound card?  The internal pc speaker just gets one bit from
> someplace to make tones.
> 
> bill
> 
> 
I'm talking about the internal PC speaker, I already mentioned that
is's just a binary output which removes any problems with linearity
etc. Basically the scenario is this:

1. I have the output from the motherboard for the PC speaker. I have
no control over it (I don't want to muck around with software drivers,
plus this should also work for BIOS beeps and whatnot).
2. I want to control the volume using a PIC microcontroller

The idea you mentioned would be fine if I were generating the tones,
but I am really just post-processing the signal. Besides, the
difference in duty cycle would be noticeable to the human ear if I
just vary it to change the volume.

-- 
Hector Martin (hector@marcansoft.com)
Public Key: http://www.marcansoft.com/hector.asc

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