> On Feb 6, 2015, at 12:42 38, James L. Stewart <jstew...@paceaudio.com> wrote: > > On the RPI audio output. I seem to remember someone claiming the audio > output of the RPI being inferior in some way such as it only really being > about 14-bit resolution. (I think "CD audio" is also only 14-bit with an > algorithm that fakes it up to 16 bits).
Standard ‘Red Book’ CD audio is linear 16 bit stereo PCM (big endian) at 44100 samples/sec with no companding. See http://en.wikipedia.org/wiki/Compact_Disc_Digital_Audio. There is also a quadraphonic (4 channel) mode defined, but it is very seldom encountered In The Field. > It seems to sound okay to me, but perhaps I am not listening critically > enough. The RPI does play (and record) just fine using USB audio devices (as > I'm sure the BBB does too), but I am concerned that just about all I/O (like > Ethernet) on the RPI is "funneled" into its (eventually single) USB input so > I think one needs to be careful not to overload this bus. IIRC, the onboard audio (output only) is also implemented via the USB subsystem. My experience is all with Gen 1 units, so take it with a large grain of salt. Cheers! |----------------------------------------------------------------------| | Frederick F. Gleason, Jr. | Chief Developer | | | Paravel Systems | |----------------------------------------------------------------------| | A room without books is like a body without a soul. | | -- Cicero | |----------------------------------------------------------------------| _______________________________________________ Rivendell-dev mailing list Rivendell-dev@lists.rivendellaudio.org http://caspian.paravelsystems.com/mailman/listinfo/rivendell-dev
