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Altera_Forum's avatar
Altera_Forum
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16 years ago

Pre-Emphasis with IIR Filter

Hello! I want to do a classic Pre-Emphasis with VHDL. Normally this is implemented with an IIR-Filter. I tried to do this in VHDL with the following formula I found in the web: y(i)=x(i)-(x(i-1...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Frequencies below to Om=1.0644 rads are attenuated, so, frequencies above to Om=1.0644 rads are amplified almost two times for ones near to pi. Check you are using an enough bit size for output, a small one could cause your problem.