soundcheck wrote: > To all: > > Anybody figured out the best resampling settings?? Here's a thread about this: http://forums.slimdevices.com/showthread.php?99088-Upsampling-Impressions On the 5th post JohnSwenson details squeezelite -u argument and states his preference.
I also played quite a bit with these upsampling recipes not only by listening but also visualizing their effect on an impulse and on a pink noise wav. I used a virtual sound card tool (Virtual Audio Streaming) to save the audio stream from squeezelite and used Audacity to visualize the resulted wav. You have to play with fifth and sixth fields (passband_end and stopband_start) if you want to try a slow roll-off characteristic like that of DF1704. If you increase stopband_start you can decrease passband_end. The default upsampling is "-u hL" which translates to "-u hL::1:20:91.3:100:50" with all -u parameters. Recipe I'm using for a slow roll-off filter is: "-u vL::1:28:55:150:50" or it's minimum phase counterpart "-u vM::1:28:55:150:0" The recipe for Ayre's Listen filter is something like this "-u vM::1:28:25:180:0" You can play with quality values too. I don't like 'm' but cannot tell the difference between 'h' or 'v' JohnSwenson's suggestion of "mI:::28" is inconsistent as he uses medium quality and 28 precision which is for very high quality. My guess is that squeezelite actually uses very high quality for a "mI:::28" recipe. Would be interesting to resurrect the Upsampling Impressions thread for further impressions. Zsolt ------------------------------------------------------------------------ vzs's Profile: http://forums.slimdevices.com/member.php?userid=42968 View this thread: http://forums.slimdevices.com/showthread.php?t=97046 _______________________________________________ unix mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/unix
