Dirty Digital [sic.]
 

"Don Pearce" wrote in message
et...
David Looser wrote:
"Don Pearce" wrote in message
...
If this were a first order filter you could probably hear the resultant
half dB approx. at 10kHz. I think I may be able to do that.

Do you? I'm amazed.

David.

Probably not with music, but I've just tried it with noise, and it is no
problem at all. Interestingly, I also tried a 17th order Butterworth
filter 3dB down at 20kHz, and although the effect is subtle, I can
reliably identify it.

This, presumably, is an A-B test. If you were presented with just one or the
other without knowing which it was, would you be able to identify it?

David.

Dirty Digital [sic.]
 

Don Pearce wrote:

Eeyore wrote:
Phil Allison wrote:

and consisting of an array of ceramic resonators.

THAT's why it sounded so awful !

Can you imagine the phase response and group delay of an analogue filter
that steep?

Don't even get me started. Why do you think there were Apogee filter
upgrades for PCM3324As and the like ?

WTF no-one chose a sensible sampling frequency and a half sensible bit depth
is forever beyond me.

20 bit and 60 kHz would have done nicely.

Graham

Dirty Digital [sic.]
 

"Dave Plowman (News)" wrote:

Eeyore wrote:
Phil Allison wrote:
"Phil Allison"

**Typo:

Response was -1dB at 20 kHz,

CRAP. That's readily audible.

It might be to your dog, listening to sine waves. But 1dB down at 20k
won't make any audible difference to any real world audio signal.

I can hear it, at least certainly used to be able to.

Just because YOU'RE deaf, don't assume everyone else is.

Graham

Dirty Digital [sic.]
 

David Looser wrote:

Absolutely. How many humans can even hear 20k, let alone notice a 1dB drop.

I used to be able to 'hear' - more accurately be aware of - at least 24 kHz.

Designing the CD spec around old deaf ****s was the worst move ever.

Graham

Dirty Digital [sic.]
 

Don Pearce wrote:

If this were a first order filter you could probably hear the resultant
half dB approx. at 10kHz. I think I may be able to do that. But it is
seventeenth order or so, and is therefore flat to well beyond 16kHz.
That makes the un-flatness definitely inaudible.

I'm so pleased to hear that.

And when was yout hearing last tested ?

Graham

Dirty Digital [sic.]
 

David Looser wrote:

"Don Pearce" wrote

If this were a first order filter you could probably hear the resultant
half dB approx. at 10kHz. I think I may be able to do that.

Do you? I'm amazed.

I'm not. In fact I reckon almost ALL the equipment differences associated
with alleged 'speed, pace, depth' and you know all the other **** all crap
explanations are merely subtle frequency response variations.

But the scientific explanation is too BORING of course.

Graham

Dirty Digital [sic.]
 

John Phillips wrote:

http://www.adrian-kingston.com/CDP-101.htm purports to have details and
partial circuit diagrams.

CDP-101 ?

You want me to throw up ?

Graham

Dirty Digital [sic.]
 

John Phillips wrote:

While such an extreme phase respose offends my engineering sensibilities
I still have not found credible references to tell me about the audibility
of phase shifts. If anyone knows of such material I would be interested.

Try your hearing.

Graham

Dirty Digital [sic.]
 

"Eeysore Raving Nut Case Pommy Prick "


"Phil Allison"

**Typo:

Response was -1dB at 20 kHz,

CRAP. That's readily audible.


** No it ain't - you ****ing trolling idiot.




....... Phil

Dirty Digital [sic.]
 

"Eeysore Criminally Insane Pile of Pommy **** "



You want me to throw up ?


** Nah - just chuck your stupid, fat arse off the nearest high bridge.




....... Phil