How to recover bits coded by different frequency values (states)?

Hello. I'm trying to complete a task. Firstly I was supposed to download a FM modulated signal.

[y,fs] = audioread('Olivia16-500.wav');

And then I have to recover bits that are coded by different frequency values. How can I do that? I was trying demodulation:

fc=1000;
z=demod(y,fc,fs,'fm');

But I don't know what to do next. Can you help me?

Answer 1

[Shubham Rawat]

Hi Sylwia,

You may use a shift keying techniques and more over to extract bits from a signal you may prepare a table which frequency correspond to what set of bits, and then when you receive a particular frequency based on this table. Now you can extract bits from that.

For Shift Keying Techniques:

https://www.mathworks.com/matlabcentral/fileexchange/66543-shift-keying-techniques

Hope this Helps!