fsk demodulator

[hubert12]

Hello,

I'm interested by the results of your work but i don't have the last version of Labview. Please, can you save your VI's with Labview 2011?

I would like demodulate fsk from mic audio input. The sound is delivred with VHF receptor (output jack for earphone connected to mic audio input on my conputer).

Thanks you very much.

[tucoi98]

Hello ThiCop,

Is there some way to ''catch'' the packet without the sync sequence? I mean,  I need a way to detect when the packet starts and ends without having this sequence. Until now I thought that the sync sequence that I have been using was correct but it's not the sync sequence that the transmitter use. As now I don't have any information about this sequence, could I implement some ''energy detection'' or somethin similar to catch only the bits within the packet? If so, could you have any example?

Thank you very much in advance

[ThiCop]

Hello Sambeiro,

I don't fully understand the question.

In your code you were already definining your own sync sequence.

Of course you can also change this one.

If you don't want to use NI's integrated synching in the subVI's, then you can also write this yourself.

"Energy detection" is a bit too vague as a desciption for how the synching should be, so I will need more information.

Can you describe in your own words how you want to detect the beginning of the sequence?

Or do you have an idea on how your transmitter implements synching?

[tucoi98]

Hello ThiCop,

I don't know exactly how to do it. I don't know how you normally detect the beginning of the packet without having a sync sequence previously.

Have you ever done something similar?

Thank you in advance

[ThiCop]

Hello,

Yes, I have.

However, normally you should know what you will be sending.

This should be part of the specifications of your project.

Base on that you can define how you should demodulate it.

What information do you have about the transmitter?

Or do you have also the freedom to make your own transmitter?