Andrew Gaffney wrote:
I am currently working on building my own Linux-driven Big Mouth Billy Bass according to the instructions at <http://bigmouth.here-n-there.com/>. In order to have the thing play the custom audio clips, I have to run patch cables from my audio out on my sound card to the speaker on the bass. When reading the following, keep in mind that this current project is my first run-in with low-level access to RS232, parallel, or anything similar.
I want to be able to emulate a sound card in software so that what would normally come out of an audio out on a regular sound card can be sent through a certain pin of the parallel port without any hardware modifications to the computer the program is running on. I don't even know if the parallel port can even be accessed that way. Can anyone either just shoot this down now or point me in the right direction?
hmmm ... sorry, but I really can't see the reason u like to use parallel or even serial port as audio output ... because u need DAC then, and I really don't know how to do it without additional HW.
In case u like to use one pin output, u need to emulate PWM, and that will be terrible CPU expansive, compared to sound card. Output HW (integrator) u can copy (or take) from your CD audio player :-).
If u use 8 bit output, u need minimum DAC made of 9 resistors. But do not expect HiFi output then :-). Adjusting of high quality audio DAC is not so easy (cheap), so most of CD players use PWM.
Any cheap PC soundcard will have the output of incomparable higher quality, so why not use it ?
The whole idea was nothing more than idle thought. I'll just rig up something where a patch cable from the sound card can hook to one of the spare wires not hooked to the parallel port, but in the same bunch.
-- Andrew Gaffney System Administrator Skyline Aeronautics, LLC. 776 North Bell Avenue Chesterfield, MO 63005 636-357-1548
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