How to create a test bench waveform for the working of band pass and low pass filter

What is the purpose of the test bench? If you purpose is to look at the filter response, then in my opinion it is better to examine the filter response. Say you have the filter coefficients b and a, then you can do

>> fvtool(b,a)

to look at the response.

If you really want to pass the data, you can use randn to generate some white noise data and then run it through the filter, e.g.,

>> x = randn(1024,1);
>> y = filter(b,a,x);

HTH

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Jim 2011-9-28

Hi,

Thanks for ur reply

So,without using my friends testbench function filterIIR2t(x,Num,Den) we can directly use inbuilt function

filter(b,a,x)

But when I am using this function filter(b,a,x) I am not getting any response

Can u suggest me something about this

Thanks in advance

Wayne King 2011-9-28

Did you design your filter as a filter object, or as coefficients.

filter() also works with filter objects, so if you have a filter object, use

filter(Hd,x) where Hd is your object

if you have coefficients, then b should be Num and a should be Den

filter(Num,Den,x)

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