ADAPTATIVE / DYNAMIC LOUDNESS

Hello Bolk,

This is a quick answer to help you move forward. 

The processing you are using for the loudness block does not look like it will produce the correct output to drive the loudness control. 

It requires a signal between 0 and 1 and you are using a hard clipper set to integer clipping on the low side set to 2. 

Then going into a log table. I am not sure what the table values are but this does not look like it will function as you intend to have it function. Here is the Wiki help file on the Loudness block.

Loudness (Low and High) External Control [Analog Devices Wiki]

In an earlier post I discussed and included an example of a loudness function that I hard-coded instead of use the block. This way I could control the exact filter I want applied at an exact level. This example is for the ADAU1701 so you need to make some adjustments due to the processor core but the basic idea is here.  

(+) Dynamic changing of EQ presets based on volume potentiometer level - Q&A - SigmaDSP Processors & SigmaStudio Dev. Tool - EngineerZone

Dave T

Hello Bolk,

This is a quick answer to help you move forward. 

The processing you are using for the loudness block does not look like it will produce the correct output to drive the loudness control. 

It requires a signal between 0 and 1 and you are using a hard clipper set to integer clipping on the low side set to 2. 

Then going into a log table. I am not sure what the table values are but this does not look like it will function as you intend to have it function. Here is the Wiki help file on the Loudness block.

Loudness (Low and High) External Control [Analog Devices Wiki]

In an earlier post I discussed and included an example of a loudness function that I hard-coded instead of use the block. This way I could control the exact filter I want applied at an exact level. This example is for the ADAU1701 so you need to make some adjustments due to the processor core but the basic idea is here.  

(+) Dynamic changing of EQ presets based on volume potentiometer level - Q&A - SigmaDSP Processors & SigmaStudio Dev. Tool - EngineerZone

Dave T

Hi Dave,

Thanks for the help !
Indeed, in the first file attached, I'm not using the classic loudness block.

I'd like to fin the correct way to use the classic loudness block with dynamic control.

I was thinking about envelope peak rms (that I don't find in ADAU1467 tools), or RMS table to output 0-1 values.
But I don't know how to do it correctly.