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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

additionally you can design your fir as decimator since your 200KHz can be reduced right to 2*20 = 40KHz or so (say 50KHz) then you have decimation factor of 200/50 = 4

hence your filter mults will go down to 26 per filter