I am using adau1701.
I use a MCU to do some audio level value read back.
I have follow the below thread which solve half of my problem
Another problem I found is the different between using a peak envelope and RMS envelope.
I do a sine wave source, with a gain control, follow by a envelope block and finially the reading block.
I can get the reading correct when I use the peak envelope.
But when I use the RMS envelope, with the same equation,
I get -6dB when i didn't apply any gain.
I get -26dB when i apply a -10db gain.
If I apply a gain of -20dB, the reading is -46dB
If I apply a gain of -15dB, the reading is -36 dB
It is I have a base of -6 without any gain, and then the resulted reading is -6+(2*whatever gain I apply)
Is there any equation to get the value from RMS envelope to be correct?
What is the different between the two?