filter, decay, delayed versions

Question

PChoppala 2012-9-11

Hello everyone,

I need advice on a simple query.

I need a FIR filter which has decay time specified by me.

The filter coefficients will decay either exponentially or any profile I want.

The filter will basically add delayed versions of my signal which is randn(1,1000).

How can I do this in matlab?

Cheers

P

Answer 1

Jan 2012-9-11

Perhaps something like this:

B = [1,3,2,4,5,6,4,3];  % Or "any profile you want"
B = B / sum(B);         % For example
A = 1;
x = rand(1, 1000);
y = filter(B, A, x);

PChoppala 2012-9-12

Hi,

As per your code, y is one copy of a delayed version of x. That helps, thank you.

However, just to add, I want to specify as gain decay of x (say 60dB decay) as well as a delay of 1 sec,

can you please help in this?

Thanks

P