cliveb;694654 Wrote: > Er, no. Traditional oversampling (by factors of 2) is extremely trivial > - you just stuff zero valued samples in between the existing samples. > This does not create any extra information - it just alters the > aliasing artefacts and moves them further up the frequency spectrum. > Each doubling of the oversampling rate moves the artefacts one octave > higher. The purpose of oversampling is simply to allow a gentler > analogue reconstruction filter to be used. > > I'm not so sure about what's now called "upsampling" - where the > increase in sample rate is not a factor of 2. That does require new > sample values to be computed. (I'd guess that it's done by first > oversampling by a large factor of 2, applying a digital reconstruction > filter, then resampling the result at the desired target rate. Please > can someone correct me on this). Frankly I cannot see the point of > upsampling - it acheives nothing of practical value that simple > oversampling doesn't.
The main benefit (or I should say "aim" or "intent") of ASRC (hardware upsampling) is to reduce certain types of jitter. It does indeed invent new sample values. I think this is a "swings and roundabouts" situation, personally. Many DAC's use ASRC's.... AND internal oversampling! -- Phil Leigh You want to see the signal path BEFORE it gets onto a CD/vinyl...it ain't what you'd call minimal... Touch(wired/W7)+Teddy Pardo PSU - Audiolense 3.3/2.0+INGUZ DRC - MF M1 DAC - Linn 5103 - full Aktiv 5.1 system (6x LK140's, ESPEK/TRIKAN/KATAN/SEIZMIK 10.5), Pekin Tuner, Townsend Supertweeters,VdH Toslink,Kimber 8TC Speaker & Chord Signature Plus Interconnect cables Stax4070+SRM7/II phones Kitchen Boom, Outdoors: SB Radio, Harmony One remote for everything. ------------------------------------------------------------------------ Phil Leigh's Profile: http://forums.slimdevices.com/member.php?userid=85 View this thread: http://forums.slimdevices.com/showthread.php?t=93990 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/audiophiles
