- Divide Vin by Vref with a Divide block or a Gain block. The block output is Vin/Vref.
- Take the log of the output with a Log block. The block output is ln(Vin/Vref).
- Multiply by K with a Gain block. The block output is K*ln(Vin/Vref).
Logartihmic Amplifier in Simulink
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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.
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Accepted Answer
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.
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
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.
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