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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Non-oversampling mod posted by Tim Walpole on February 7, 2001 at 08:41:22:
Hi Tim,I do not profess an absolute answer, but here is my 2 cents...
In theory you could do the non-oversampling mod to a bitstream player, but you would then have a one bit player with no oversampling (and MORE IMPORTANTLY no digital filter depending on the design) - this in my view would probably not sound good at all. (maybe even unlistenable or dangerous to downstream components due to higher levels of RF??).
What makes a one-bit/bitstream player work is a high level of oversampling, typically 64x or 128x and steep digital filter. In a one-bit/bitstream player you have one bit that must be accessed very rapidly for a given data throughput. In a multi bit player you have many bits (16 to 24) which can be accessed far less rapidly for the same data throughput. The multibit player should therefore generate far less RF and be more ameanable to either no or simpler output filtering- i.e: you can remove/bypass the digital filter and oversampling chip (often one and the same). NOTE: You may then need to introduce some form of ouput filtering to protect downstream components.
It is my view that the typical non-oversampling mod of bypassing the digital filter/oversampling chip is really only applicable to CD players with mulibit DACS- perhaps even for the reasons stated above! (any digital gurus please advise).
As a point of interest the world's first comercial CD player, the SONY CDP101 was a 16 bit player with no oversampling. Without oversampling and digital filtering these early players required extensive (read expensive) analog ouput filtering. It is for this reason that Sony and Philips (and then everyone else) turned to oversampling as this allowed for filteing in the digital domain and little or no analog output filtering.
We may have taken the wrong turn along the mass market cost cutting road.
If anyone tries the non-oversampling mod on a onebit/bitstream/mash machine I would be interested in their comments.
Hope this helps.
HAVE FUN,
JOEY.
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Follow Ups
- Re: Non-oversampling mod - JOEY 16:04:59 02/07/01 (3)
- Re: Non-oversampling mod - -Steve 11:15:50 02/08/01 (0)
- not possible - Werner 03:16:16 02/08/01 (1)
- Re: not possible - Tim Walpole 03:37:06 02/08/01 (0)
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