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A Question on FIR filter and it's Bode plot

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usrocky

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A Question on FIR filter

Hi, all
I have encountered a FIR filter question couple days ago.
A guy gave me an impulse response of a FIR filter(z transform equation), and ask me to plot the bode plot of it.
I am confused about the question, isn't bode plot is the magnitude and phase response of the loop gain(AB). Since the FIR filter doesn't have feedback factor(not IIR), how can i plot the bode plot?
is B=0? and bode plot go infinite?
or B=1, Bode plot of a FIR filter is the same as it's magnitude and phase response with logged frequency axis?
thanks:?:
 

Re: A Question on FIR filter

Hello usrocky,


I think you can plot with Nuhertz Filter Solutions product...
**broken link removed**

I have attached corresponding picture for your refernce...


---manju---
 

Re: A Question on FIR filter

usrocky,
If there is no denominator term, just assume the denominator is 1, and compute the frequency response by making the substitution z=exp(jw), evaluating the response from w = 0 to w=Ws/2, where ws is the sampling frequency.
Regards,
Kral
 

Re: A Question on FIR filter

hi, kral
that's what i told the guy, but i am not sure freq response and bode plot are the same thing
thanks
 

Re: A Question on FIR filter

usrocky,
A Bode plot is a frequency response with restrictions on the scaling of the gain and frequency axes. Frequency response can be specified with any desired scaling for the gain and frequency. Often frequency response refers only to the gain vs frequency, without regard to phase. A Bode plot includes both amplitude and phase. Here's the important distinction:
.
A Bode plot describes the gain (vertical axis) in dB, and frequency (horizontal axis) on a logarithmic scale. To be complete, a Bode plot must also include the phase on a linear scale vs frequency on a logarithmic scale.
Regards,
Kral
 

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