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how to use FIR Decimation filter in matlab.

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siyom

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I'm simulating an AM demodulation system and I can't seem to get the FIR Decimation filter to work properly...well atleast that's what I think is the problem.
Here's the matlab simulation
33257jc.png


and here's the spectrum of the output from the FIR decimation filter and the Low pass filter

347txfm.png


here are the FIR decimation parameters

2vil2y0.png
 
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