Hi everyone!!! i'm new to STM32f4. i was wondering if this microcontroller can amplify an input analog signal through audio jack i.e an audio signal and produce amplified voltage at any gpio pin...
No I don't believe so. If you look at the manufacturers page you'll see it implements S/PDIF which is a digital interface for audio but it does not implement any analogue to digital or digital to analogue converters. And you really wouldn't want to drive a speaker directly from a microprocessor.
-Ulp, looking again I see it does implement ADC which would have been the main impediment. Sorry about that.