Anybody a idea of how to design an automatic fader?
The fader should be triggered if signal (speech) is present on an input and the fader should ramp up from -3dB to 0dB in a period of 2 to 3 seconds.
It should also have a 'hold' time of about 1 second to maintain 0dB if speech drops for less than 1 second.
In addition to this question:
the signal (line level, max 0dB) is connected to the analog opamp stage (0dB gain) and is feeded (symmetrical) to the Codecs (AD1938) + and - input: what is the level inside the DSP (1442)?