On Mon, Feb 16, 2009 at 09:27:18PM +0100, Arnold Krille wrote:
> Are they really upsampling?
AFAIK nobody is doing that today. Some of the very early
Sony converters for recording digital audio on video tape
used to do this, compensating for the half sample delay
on the second channel by the same trick on playback.
Just consider this: a very good digital antialiasing
filter operating at 8 * Fs (i.e. 8 * upsampling) costs
almost nothing if integrated on the DA chip. An analog
one for 44.1 or 48 kHz would require precision components,
very careful board design, and probably manual alignment
of each individual board. The choice is easy to make...
> The devices I work with on the other hand go exactly
I imagine they have !! The fastest one I was involved
with was 1G, it drove most of the design team crazy,
and required a collection of dirty tricks to get it
interfaced to an FPGA, but that was five years ago...
Laboratorio di Acustica ed Elettroacustica
O tu, che porte, correndo si ?
E guerra e morte !
Linux-audio-user mailing list