Maybe I could postpone its design, but I just learn Matlab Simulink a little, so I decided to test my new skills.

I found this interesting article Design and implementation of a new digital automatic gain control by Etienne Tisserand, Yves Berviller describing the forward AGC control, so I decided to adapt this solution to my requirements:

• sampling rate = 48000 Hz
• data format = 32 bit two's complement
• dynamic range > 40 dB
• Adjustable Attack and Decay

I simulated on Simulink and created a VHD function to be used in Vivado.