Logartihmic Amplifier in Simulink

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Federico
Federico on 27 Mar 2023
Commented: Federico on 28 Mar 2023
Hello,
I need a block that function as a Logartihmic Amplifier for a sound level meter desing in simulink.
I tried ussing the Amplifier block, but i dont know how to adapt it to my needs.

Accepted Answer

Daniel
Daniel on 27 Mar 2023
If you just want to implement this generically, it shouldn't be hard to build up from the mathematical definition.
  1. Divide Vin by Vref with a Divide block or a Gain block. The block output is Vin/Vref.
  2. Take the log of the output with a Log block. The block output is ln(Vin/Vref).
  3. Multiply by K with a Gain block. The block output is K*ln(Vin/Vref).
If you want that to look pretty, you can package it in a subsystem, and perhaps create a mask to define K and Vref.
  3 Comments
Daniel
Daniel on 28 Mar 2023
You can use a Gain block in that case, which has one input and one parameter.
You can also use Constant blocks to create non-varying signals.
Federico
Federico on 28 Mar 2023
Thanks ! Ill try that and will get back to you.

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