JohnSwenson;541039 Wrote: > Thats not correct, the Wolfson DAC is only used for the internal speaker > used for the bleeps and blurps etc. The AKM chip goes to both the > headphone amp and the analog outs. > > The analog outs have a resistor and one cap in the path between the DAC > and RCA Jacks. The headphone out has a cap, resistor, the headphone amp > and another cap. > > There is no way to have different volume for the headphone RCA outs, > they are the same. > > The headphone out can also be shared by the IR blaster circuit. There > is an enable signal to each (headphone amp and IR blaster). I haven't > looked carefully at that circuit to see exactly what it does. > > The S/PDIF input comes directly out of the main processor as does the > two I2S streams that feed the DACs. All three of these are reclocked > after the processor. There are two clock muxes, one for the Wolfson and > one for the main audio which clocks both the S/PDIF and the AKM DAC. > > I think the headphone amp is running off a separate regulator from the > rest of the audio circuit. I think there is a DC-DC converter to get a > higher voltage for the headphone amp. > > John S.
Thx for clarifying that. I didn't have a chance too look inside. I just took my conclusion from looking at Alsa, where you see three different sound devices. Usually PC-speaker is not a device under Alsa on a normal PC. That's obviously different in the embedded world . One secret after another gets lifted. ;) Cheers -- soundcheck ------------------------------------------------------------------------ soundcheck's Profile: http://forums.slimdevices.com/member.php?userid=34383 View this thread: http://forums.slimdevices.com/showthread.php?t=77908 _______________________________________________ Touch mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/touch
