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The way to do FIR filter.

B

boki

Jan 1, 1970
0
I found there are two method to do FIR.

A. find the coefficient from fourier series.
B. Window method.

My thinking about A.

1. Use fourier series to contribute a desire filter curv(ac response)
2. find fourier series
3. convolution signal with series
4. Get the FIR.


I am correct?

Thank you very much.

Best regards,

Boki.
 
B

Bob Masta

Jan 1, 1970
0
I found there are two method to do FIR.

A. find the coefficient from fourier series.
B. Window method.

My thinking about A.

1. Use fourier series to contribute a desire filter curv(ac response)
2. find fourier series
3. convolution signal with series
4. Get the FIR.


I am correct?

Thank you very much.

Almost. You find the Fourier series for the
filter, then do an inverse Fourier transform to
get the time-domain impulse response of the
filter. That impulse response is itself the
FIR tap weights.

But unless you need a lot of control over the
exact shape, the window method is a lot
simpler.



Bob Masta
dqatechATdaqartaDOTcom

D A Q A R T A
Data AcQuisition And Real-Time Analysis
www.daqarta.com
 
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