T;140337 Wrote: > > I don't *know* how the SB does the downsampling, but it would > surprise > > me if it wasn't done the obvious way. That is, to downsample 24/96 > to > > 24/48, all you have to do is throw away every other sample. You're > not > > changing the word length, so no dithering is needed, and since the > > sample rate is reduced by a factor of two, no fancy DSP is required. > > That's the simple way, but not the correct way. > > The correct way is first to filter it for the new Nyquist before > thowing > away the samples. Yes, good point. The pre-filtering is required if the signal contains frequencies above half the target rate (ie. 24kHz in this case). But in practice, typical musical signals contain little or no such frequencies, so simple sample dropping is usually safe. I think the SB approach is a very pragmatic solution, and is the way I expected it to work.
-- cliveb Performers -> dozens of mixers and effects -> clipped/hypercompressed mastering -> you think a few extra ps of jitter matters? ------------------------------------------------------------------------ cliveb's Profile: http://forums.slimdevices.com/member.php?userid=348 View this thread: http://forums.slimdevices.com/showthread.php?t=27582 _______________________________________________ discuss mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/discuss
