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

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Sylwia Kantor
Sylwia Kantor 2021-1-23
回答： Shubham Rawat 2021-2-2
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?

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回答（1 个）

Shubham Rawat
Shubham Rawat 2021-2-2
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!

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