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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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In Reply to: Re: Upsampling for dummies posted by Todd Krieger on June 12, 2005 at 23:50:52:
"The main difference between classic "oversampling" and the more modern "upsampling" is the newer method often uses a chip external to the final D/A chip (where "oversampling" is done within the D/A chip)"This is not quite accurate, as historically the oversampling digital filters were positioned in a separate chip (think SAA7220, 7221, BB's DF1700-series, their NPC equivalents, and indeed the first PM HDCD chip). These filters could be made in CMOS technology, whereas the R2R DACs themselves required the much more expensive pure-analogue bipolar processes.
Only with the advent of integrated delta-sigma DAC in the late eighties was there a move to place the oversampling digital filter within the DAC itself. These DACs are made on CMOS processes, processes which have crappy analogue properies but which are much cheaper and offer co-integration of logic.
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- Re: Upsampling for dummies - Werner 06/14/0522:49:11 06/14/05 (0)
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