Hi,

1/ We have tone freq estimation in our FSK demod as the modulator used 
for balloon telemetry tends to drift.

(2) and (3) are general questions that are not related to the codec 2 
project.

- David


On 21/09/16 14:30, Qasim Chaudhari wrote:
> Hi,
>    I have three questions about an FSK modem.
>
> 1. When - and when not - is carrier frequency estimation necessary for
> FSK demodulation? When it is required, how should we do that? Note that
> it's different than phase recovery that is done for coherent demodulators.
>
> 2. For coherent demodulation, how can phase be recovered in FSK case? So
> for example, how to design a PLL phase detector in that case? Is there
> some feedforward scheme as well?
>
> 3. How to implement an equalizer for FSK modulated signals?
>
>    Appreciate your help.
>
> Cheers,
> Qasim
>
>
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