Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

input to IIR filter in Verilog

Just a quick question regarding implementing an IIR filter in Verilog... At the moment, I am using the Wolfson ADC on the DE2-70 to convert analogue sound input from Line In to digital bits - t...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

I agree, that there are many possible number representations. When going to filters, it's necessary however to be clear about coefficient scaling. Using fractional numbers is one of several ways to achieve this. For several reasons, I assumed that the MATLAB fixed point tool is using a fractional number representation, but I didn't verify. The said "Input Word Length" & "Input Fraction Length" specification also suggests this understanding.