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Hello,
I
tested digital filter by giving the sweep signal. Is there any
other method to basically check, filter is working or not ??
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How to test filter is working or not
Started by ●February 17, 2005
Reply by ●February 18, 20052005-02-18
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Sridhar, Response to a step input is a quick way to check the time tomain response. Regards, Jon _____ From: Sridhar gadda [mailto:] Sent: Thursday, February 17, 2005 11:23 AM To: Subject: [matlab] How to test filter is working or not Hello, I tested digital filter by giving the sweep signal. Is there any other method to basically check, filter is working or not ?? |
Reply by ●February 20, 20052005-02-20
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The most important tests for the digital filters is the stability. The simplest thing would be to use graphical root-locus technique or most sophisticated FFT based oepstral method. This will certainly validate your design of digital filter.. Sridhar gadda <s...@yahoo.com> wrote:
Dr. Rajanish Kamat email: r...@ieee.org Electronics Department, Ph: +91-9422437331 Goa University, GOA - 403 206 INDIA
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Reply by ●February 21, 20052005-02-21
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Sridhar- > > I tested digital filter by giving the sweep signal. Is there any other > method to basically check, filter is working or not ?? One way is to run an impulse through your filter: for n=0 to N-1 if (n == 0) x[n] = 1 else x[n] = 0 y[n] = a0*x[n] + a1*x[n-1] + a2*x[n-2] ... + b0*y[n-1] + b1*y[n-2] + ... end then take FFT(y). The above example is for IIR filter; if you are using FIR filter, then all bn = 0. To get the impulse response length, you can make N something like 4096 or you can watch y[n] output until it becomes flat and no longer changes. -Jeff |
Reply by ●February 21, 20052005-02-21
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Sridhar- > > I tested digital filter by giving the sweep signal. Is there any other > method to basically check, filter is working or not ?? One way is to run an impulse through your filter: for n=0 to N-1 if (n == 0) x[n] = 1 else x[n] = 0 y[n] = a0*x[n] + a1*x[n-1] + a2*x[n-2] ... + b0*y[n-1] + b1*y[n-2] + ... end then take FFT(y). The above example is for IIR filter; if you are using FIR filter, then all bn = 0. To get the impulse response length, you can make N something like 4096 or you can watch y[n] output until it becomes flat and no longer changes. -Jeff |
