how do i get a sinewave through serial db9 to computer

what hardware do i need, I will be sending a baby crying sound to the pc and want it to display on the Java guis, please help on what hardware i need, thanks.

You will need to convert the audio data to digital first then sent this data using serial communication protocol to the computer via serial port and then create a software which can utilize this data and do whatever you want with the data
Search google and you will find many schematics and softwares which u will be requiring to do in the project

Microphone -> Aliasing filter (4 kHz) -> ADC -> uC -> MAX232 -> RS232
One point to note is that the human voice is usually sampled at at least 8kHz. A baby's voice may be more hellish than a normal human. So the serial speed may not be fast enough, and some buffering may have to be done.

What about:
Microphone->Soundcard->Powerfull PC SW ?
This is the simpliest solution.

yeah, it seems like using the serial port for sound input is ridiculous when just a few inches away on the back of nearly any computer, there's a dedicated audio input port :lol:

evandude said:

yeah, it seems like using the serial port for sound input is ridiculous when just a few inches away on the back of nearly any computer, there's a dedicated audio input port :lol:

Click to expand...

Yes, Exactly. Sometimes people try to "invent" something new but they always choose the hard way and don't search if it was designed before.

Hey, I can't say too much. I did once find myself wanting to bring my oscilloscope for a ride in the car, hooked up to a microphone, so I could look at the FFT of the noise in the car, as a means of identifying the main frequency content of the "road noise", so that I could design some filters to remove it from the microphone audio, so that the speech recognition software on my carPC would work better when the car was moving...

And then I slapped my forehead when someone pointed out that the soundcard in my carPC is perfectly capable of monitoring audio from a microphone, and there's plenty of software out there to act as a spectrum analyzer... not to mention, it would give me better results anyway, because it would be using the exact same input method that the speech recognition software would :lol: