Simple RC filter in the Z domain

[Egress]

Whilst I am quite experienced in designing active analog filters I haven't done much with DSP designs. Whilst I have done some reading on digital filter theory I am interested in emulating a basic first order RC filter using multiple delay sections. So my question is how many delay sections and what would their coeficients be in order to emulate a basic HF or LF filter.

I will not be using a DSP but rather a multi tap digital delay line.

 

[raghuramkarthik]

Hello There,

The RC filter has the eqv. digital domain Difference Equation as: y[n]=x[n]+y[n-1];

So all you need for this LPF are a full adder and a d flipflop(delay element).

To the adder add the input and the output fed back through the delay element.
That should be it!