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Altera_Forum
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11 years ago

demodulator with altera megafunction

hi, i've to realize a i-q demodulator for low frequencies signals with the classical scheme https://www.alteraforum.com/forum/attachment.php?attachmentid=9034 The input signal is a 1,3H...
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Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

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how did you find n and Wn of FIR1 matlab function?

Thanks

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cut off = 10Hz on a sampling frequency of 1KHz i.e. cutoff is 10/1000 relative to Fs of 1(1 cycle or 2pi)

hence 10/1000 *2(pi) = 20/1000 pi = .02 pi

n is experimental to get -60dB, you can use other options...

apply freqz to see:

freqz(h,1,0:.01:500,1000);