Regarding standard peak for ADAU1446 in SigmaStudio

I was pulled into several high-priority, time-critical projects at work over the past few weeks and unfortunately I had to de-prioritize my participation in the forum as a result. So, I apologize for making you wait so long for an answer. I am going to try to respond to everybody's questions within the next few days.

You're correct: the conversion from the GUI controls to the table points is not explained in the help file. I will contact the software team and ask for pseudocode that will show how these values are calculated. Once I receive that information, I will post it here.

The compressor table has 33 points, which matches the 33 points on the GUI. The calculation is actually done using 34 points stored in RAM. The first point stored in RAM represents the gain reduction value for any input below -90dB.

The exact mapping is available in this post:

https://ez.analog.com/message/5004#5004

Apparently we use some complex spline curves that are built into the Microsoft .NET Framework in order to get from the threshold/ratio values to the actual table points. However, I showed an example of how to calculate the points manually in the post above.

For a simple threshold / ratio control on a compressor, the pseudocode would be like this:

For every point in the table below the threshold,

Point = 1.0 (i.e. linear gain).

For the first point above the threshold,

Point = 1 divided by ratio.

For the second point above the threshold,

Point = 1 divided by (ratio squared).

For the nth point above the threshold,

Point = 1 divided by (ratio to the nth power).