Archimago wrote: > Thanks for the note Alex! Glad to see another 0404USB user :-). Let me > know if in your testing you find a good way to measure JITTER! > > Good point about checking on the Touch's CPU utilization. This AM I > logged into the Touch and ran 'top -d1' to check CPU usage every second > while playing music. I chose Prince's 'Batdance' since I had a good > 24/96 vinyl rip as well as the original 16/44; I figure a dynamic track > like this could give the Touch's FLAC decoding a nice work out. This is > with my Touch running default EDO firmware settings, ethernet > connected. > > For MOST of the time, the CPU use looks like this: > 24/96: > FLAC level 8 compression: 20-30% default view, 70-85% peak with spectrum > analyzer > > 16/44: > FLAC level 8 compression: 15-25% default view, 65-75% peak with spectrum > analyzer > > About a couple of times over the 4 minute song, the jive_alsa process > wakes up in a big way and this pushes CPU use to 90-100% for about 5-10 > seconds. I believe jive_alsa runs at realtime priority level and there's > a discussion about it elsewhere. Whether this changes sound quality, I > dunno. > > SO even though I couldn't find any sonic change going the way of TT3 > with turning off the screen and everything, I wonder if doing the > opposite - stressing out the CPU with 24/96 FLAC + spectrum analyzer > view running during playback lead to stuff like increasing noise > floor... Maybe I'll give this a try tonight.
Hi again, Thanks again for doing these measurements - nice to have some data to discuss rather than the usual subjective opinions for FLAC vs. WAV. It would be nice to do some Null measurement - can you do this with Rightmark?. FYI, I use Triode's EDO plug-in, and a Cambridge Audio Azur 851C upsampler as a DAC. It would be great to know if you can measure any difference in noise or distortion in this worst-case scenario, but my money is on it not making a measurable difference. With this configuration, CPU utilisation stays at 35-40% with FLAC playing at 24/192 (2L sampler). I usually stay with the 'now playing' screen saver, but do have somthing of a weak spot for the old VU meters!. Cheers, Alex ------------------------------------------------------------------------ AlexM's Profile: http://forums.slimdevices.com/member.php?userid=40609 View this thread: http://forums.slimdevices.com/showthread.php?t=97950 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
