[Dspforum] FSK variable threshold

[Joseph Haber]

Sean,

Yes, let's start without worrying about this. A real implementation would be
tracking the input noise level, and would require a minimum SNR out of each
of the filters. There would also likely be some AGC up front as well...

Joseph

On Tue, Nov 24, 2009 at 10:47 AM, O'Connor, Sean R. <Sean.OConnor at jhuapl.edu
> wrote:

>  For the FSK demodulation, I am assuming we do not need to worry about
> varying input volume levels?  As an example, my design works on a fixed
> threshold to determine 1's and 0's, so below a certain input signal
> amplitude everything will be 0's.  In a real FSK receiver, I'm thinking this
> function would be taken care of in an AGC/limiter type amplifier prior to
> digitization.  But I'm curious if this is something that could be done
> efficiently in a DSP?
>
> Thanks,
> Sean
>
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