Using ARM for signal processing

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1

I don’t have access to a signal processor in my design. However, I have to process multiple signals on a single (wireless) bus. The way they are distinguished is via frequency and phase offset. There are three separate frequencies that must be distinguished from each other.

I would like to perform a series of correlations but afraid that would quickly overload the processor (it also has to run an OS and numerous other tasks). Is there a simpler method to distinguish several slow frequencies? The signals are all at around 10 Hz.

Thanks!

2

your goal isn’t very clear, but here goes…

if you have several 10Hz type signals…

Let’s assume they’re analog signals.

You’d sample them at 20Hz or more. Say 100Hz.

A chip with a multi-channel A/D would do. Sample the signals in succession, if that’s OK. The A/D rate might be 200KHz max sample rate at max.

Faster with a separate A/D.

Then what? FFT/IFFT/DFFT?

Just an amplitude vs. time histogram?

Then what?

3

Goertzel algorithm? But I think the point at which a FFT is better than multiple Goertzels is around 3.

Are the signals simultaneous, or is this more like an FSK decoder? What’s the bandwidth of each individual signal?