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Altera_Forum's avatar
Altera_Forum
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11 years ago

fir filter for fsk demodulator

Hi, i've realized an i_q demodulator for fsk message. The frequencies for the 0 and for the 1 are spaced 400Hz; the baud rate is up 200baud. The frequencies are in the audio range (for example F...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

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in this way the parameters to pass to filter after the decimator is:

Fs=50KHz;

Fcut=100Hz

Fstop=400Hz

is it right?

Can i use the FIR compiler 2?

--- Quote End ---

No...

Fs is 200KHz

Fcutoff ...etc use same filter I gave you (cuts at 200Hz and achieves -40dB at 6300Hz.

you can use fir compiler. The output will be decimated to 50Ksps on same system clock of 200Khz (as rate of valid out will indicate)