Heh! Thats why it is still marketing writing by benchmark. They must mean simply "Aliasing" with this "image fold back" What is for sure that this so called Apodizing/minimal phase filters often are used together with filters that don´t filter strong enough at 22kHz so these do alias for sure. If the filter is steep enough some aliasing can´t hurt, it will only happen at very low level. An apodizing filter that does work for sure is the Meridian one, no aliasing and no pre-ringing but frequencies above 18.5kHz change in phase and amplitude. Of course that is what i doubt really changes audibility with modern DACs. It is just that Meridian has a nice patent here to sell and attract.
Also always think about what you do resample. Many 44.1kHz material already is filtered steep at below 21kHz. Using a strong ringing filter that does this at 21.5kHz for example doesn´t hurt at all because there is no content that can ring :) One funny thing i noticed together with this is that even Pyramix seems to have a strange vision about Apodizing. Look at the graph here for "Pyramix 7 (Apodizing Filter)" http://src.infinitewave.ca/ It strangely has a linear phase response and aliasing. Huh? This must be a simple standard filter that allows aliasing, no sign of apodizing at all. I wonder if Pyramix has more strange settings for their filters and thats why some "experts" hear Pyramix filter sounding better with strange non-linear settings. ------------------------------------------------------------------------ Wombat's Profile: http://forums.slimdevices.com/member.php?userid=4113 View this thread: http://forums.slimdevices.com/showthread.php?t=96098
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