In article , David Looser
wrote:
"Fed Up Lurker" wrote

NONOS is "non-oversampling", which isn't a truly full or accurate
acronym.

True. The letters "non" should not be capitalised as they are not the
initial letters of words.

It is the disabling/by-passing the digital filter pre conversion (as
opposed to the post conversion analog filter ). There is plenty
available about this simple mod online. The controversy that surrounds
this DIY* mod is that the traditionally accepted to be required
brickwall filtering is defeated. This of course results in
quantization is not pushed (oversampled, 2x, 4x, 8x etc) out of the
audio band. To an engineer as yourself that would be alarming and
indeed it measures painfully, but the result can be magical.


Really?, it measures crap but sounds "magical"? This is the same sort of
nonsense that we get from the vinyl brigade. Early CD players were
non-oversampling, oversampling was introduced later

Erm. Even the 1st generation Philips players used x4 oversampling. So that
wasn't introduced 'later' IIRC.

because it sounded better.

IIRC they were primarily concerned by two factors. One being that
oversampling made post reconstruction analogue filtering easier/cheaper.
The other was that they weren't confident at the time that they could make
16 bit dacs at consumer prices/quantities. So my impression was that the
initial decision was based on what they thought they could make more
cheaply and reliably for a mass market.

Above based on my recollections of reading the special issue of 'Philips
Tech Rev' on the launch of CD Audio.

That said, companies like Philips do have 'form' when it comes to promoting
new ideas that "sound better" when they really mean "extend our revenue
stream". Think SACD/DSD. ;-

Slainte,

Jim

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