FPGA signal acquisition

[Jean-Yves]

Hi,

I'm working with a team of engineers on a 3-dimentional 'sonor camera'. In order to achieve this project, we need to do the acquisition of 80 analogic sound signals (each of 250 kbits/s from microphones). I am wondering if any of you tried to configurate an FPGA with LabView to process such a task.

I would really apreciate any feedback (experience or simply comments) on the feasibility of this project.

Thank

Jean-Yves Breton

PolyProjet École Polytechnique MTL

[Thør]

The first consideration here is getting 80 analog inputs into a single chassis.  For this, you could use a 4-slot chassis, with at least 3 of these 32-input analog input modules.  There are also 8-slot chassis, if you require more inputs for other purposes.  As far as FPGA coding is concerned, there shouldn't be a problem running a loop with all 80+ analog input channels.  We may run into a bottleneck here depending on how fast you need to sample these channels.  The 9205 is capable of 250kS/s aggregate sampling rate which means that you can run 1 channel at 250kS/s, 2 channels at 125kS/s each, and so on.  If you need to sample all 80 inputs at a rate of 250kS/s, you will probably have to use something like the 9223 module.  The downside to this is that there are only 4 inputs on this module, so getting up to 80 channels may be a bit of a limitation here.  Is this the sampling rate you'd like to run?  If you could go with a lower sampling rate, the first suggestion will be your best option.  Thanks for the question!

[ErnieH]

You may look at the flex rio products. Higher end and higher speeds.

[Jean-Yves]

Thanks alot for those answer, we are now considering all of those options. Any other idea will be appreciate!

Jean-Yves Breton

Polyprojet

École Polytechnique MTL