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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 or OVERSAMPLING ? posted by paco on January 29, 2002 at 09:59:07:
HiFi News article states:
"Even for the innovator and manufacturer of upsampling hardware, Data Conversion Systems Ltd, the mechanism for the sonic benefits was not easy to explain. As dCS conceded, ‘we have found that upsampling reveals information that is present in the master source, but which is not audible when the CD is played back normally. Upsampling cannot increase the amount of information in a signal and the exact mechanism behind the perceived sonic improvements is currently not entirely clear. We are continuing our research into this subject.’"
Levinson white paper states:
"By contrast, the Philips approach was designed to fool the digital to analog converter into thinking that it was working with a 176.4 kHz signal. Even though there was no additional information contained in the signal, the fact that it was being converted at 176.4 kHz meant that the bands of severe distortion were centered on multiples of 176.4 kHz (and they were still only ±20 kHz wide). Thus the lowest edge of this band of distortion reached down only to 156.4 kHz–nowhere near the audio band, and easily handled by a simpler, better-sounding analog filter.
In the long term, the Philips approach won out, of course. Every CD player since approximately 1984 has used oversampling to ensure that a simpler, better-sounding output filter could be used."
There you have it. The boys at dCS need not conduct anymore research.
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Follow Ups
- Interesting article - jimmyjames 01/29/0214:45:27 01/29/02 (0)
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