fellows I am designing a virtual oscilloscope with Qt or EFL for running in Qemu (for mini2440) in OS Ubuntu. There should be 4 analog inputs / signal, and then do the sampling with determined frequency, and then do some other calculation. Is there anyone can give me some clews or inspirations about how to generate the analog input / signal for the oscilloscope to deal with? Thank you very much!
Sincerely.
Oscar
A typical Analog-to-Digital Conversion solution for home-brewn oscilloscopes is to use the inputs of your sound card. Depending on your requirements, you could even add an extra card or two to make more inputs available.
Most sound-cards will sample at 44.1, 48 or 96 kHz, so that kind of sampling rate is only suitable for audio applications. On the other hand, you have at least two channels for free in most computers - and if you need more you can always use a
usbaudiodevice.You might want to have a look at xoscope which uses this approach.
If you need to go higher than that sampling rate then you are looking for lab-grade Data Acquisition devices. There are some relatively cheap solutions, but the key word here is relatively - they are generally quite pricey, at least for personal use.