Hi,
The block "AVC" is used.
The curve of this AVC is as follows: it follows the input with a gain of -18dB and saturates at level of 0.538Vcc (crete-to-crete).
The 0dBFS level is 1.1Vcc, so here 0.538Vcc is near 0dBFS.
I noticed that when I change the default values, the behaviour of the device does not change a lot (??).
When we need to implement an AGC , we need in fact the "reverse".
I.e. a high gain for low input signal and the circuit must saturate near to ~0dBFS so that the gain is kept ~1
We have 2 solutions: put an amplifier at the input or put an amplifier at the output.
Put an amplifier at the input channel, the gain is limited to 48dB to avoid saturation for high levels.
Put an amplifier at the output stage, here there is no saturation issue.
It is also possible to put both.
What is the good solution relative to the signal to noise ratio ?
Is there a normal configuration ? I mean the value commonly used for such a device?
Do you have experimented this circuit?
How could we test it? Of course it is not a linear circuit so a Bode curve does not make sense here.
Does it exist an official curve of the normalized voice for films Dolby5.1 ?
If you can illuminate my poor knowledge of this subject, you are the welcome.
Best regards,
Patrice
