Can jitter be introduced on the A-D stage? As I understood Mike Gray's posting, he was saying jitter
can be induced from the get-go, in the A-D process. Konrad, do you know that to be untrue?
Also, I've been told by one of Sony's senior EE guys that it can be baked into a glass master. As I
understand it, jitter can be induced any time the bits are clock-aligned for whatever reason. I'm
not sure why that occurs in making a glass master, but a lot of research was done on this back in
the 80s and 90s, at least that's my understanding from what the Sony guy told me.
So, I think (but may have learned this wrong, I'm not an EE) that bits is bits only when the bits
are kept absolutely intact and the timing-transmission is rock solid.
-- Tom Fine
----- Original Message -----
From: "Don Cox" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, February 11, 2013 8:54 AM
Subject: Re: [ARSCLIST] Audibility of 44/16 ?
> On 11/02/2013, Paul Stamler wrote:
>>> I'm calling BS on this statement. Bits are bits - a word is a
>>> representation of an analog voltage value. If you think analog
>>> better than digital just say it, don't try to dazzle us with
>> That's not gobbledygook, it's a simplified description of jitter, a
>> known, measurable problem in digital transmission. Proper D/A
>> conversion depends on two things: getting the right bits, and getting
>> them at the right time. If they arrive at the wrong time due to
>> jitter, the reproduced waveform will be inaccurate. (The same
>> constraint applies to A/D conversion: it has to be done accurately --
>> the right bits -- and it has to be done at the right time -- which
>> comes down to jitter. Early digital systems were prone to jitter,
>> because no one had figured out that it was a problem in audio systems
>> (though data people knew about it). A couple of decades later the
>> situation was much improved; A/D and D/A converters are much better
>> these days, and one reason is that they have a lot less jitter.
> But jitter is only relevant when you are _converting_ digital to analog.
> You are leaving the digital domain.
> So long as the data remains digital (and inaudible), bits are bits.
> Don Cox
> [log in to unmask]