standard RSM compressor

Hello Semi,

The thread linked below (scroll down a ways) describes how to calculate the gain table, the attack, and decay parameters for the Sigma 300/350 compressors:

Dynamics Processors

Earlier Sigma 100/200 chips (ADAU1701, -144x, etc). have a similar arrangement except that their gain tables has fewer entries since the compressors for these chips have a smaller dynamic range.

Please ask if I can be of further assistance.

Best regards,

Bob

Hello Bob,

Thanks for the screen shot of what I have :

I saw the math for the hold & decay :)

I need to understand the Ratio (Compressor and expander definition) to be able to map it to our previous DSP (Intersil DAE-3) which had only a ratio variable.

I will re-read the input gain section.

Thanks, Semi

Hello Semi,

Bob's post is very good at showing the calculations. I recently prepared this document to show some other details of how the parameters function and understand their use if you want to do some metering to an external display.

See if this helps.

Dave T

Standard Compressor Meter variables and calculations.pdf

Hello David,

what a fantastic document. Thanks a lot

Semi