fm demodulation of recorded data using simulink

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isra
isra 2017-1-9
评论： isra 2017-1-12
hello I'm trying to input a very low frequency signal to the pc using the sound card. In order to do so, I had to change i't frequency using FM modulation which was done using timer 555. I need to demodulated it after recording in simulink, but all the blocks have frequency deviation which I don't know. Timer 555 ic only allows you to control the carrier frequency. how do I demodulate the signal?

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回答（1 个）

Ed Marquez
Ed Marquez 2017-1-11
As you mentioned, it is necessary to know the frequency deviation in order to use the FM demodulation blocks in Simulink.
Note that you can attempt to obtain that frequency deviation if you know the maximum frequency of the message signal and the carrier frequency.
Furthermore, you can take a look at the example provided in the link below to calculate frequency deviation from FM equation:
http://www.careerride.com/view/frequency-deviation-calculation-from-fm-equation-21879.aspx

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