Dirty Digital [sic.]
 

Phil Allison wrote:

and consisting of an array of ceramic resonators.

THAT's why it sounded so awful !

Graham

Dirty Digital [sic.]
 

Phil Allison wrote:

"Phil Allison"

**Typo:

Response was -1dB at 20 kHz,

CRAP. That's readily audible.

Dirty Digital [sic.]
 

Eeyore wrote:

Phil Allison wrote:

and consisting of an array of ceramic resonators.

THAT's why it sounded so awful !

Graham


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

d

Dirty Digital [sic.]
 

In article ,
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.

--
*Parenthetical remarks (however relevant) are (usually) unnecessary *

Dave Plowman London SW
To e-mail, change noise into sound.

Dirty Digital [sic.]
 

"Dave Plowman (News)" wrote in message
...
In article ,
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.


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


David.

Dirty Digital [sic.]
 

David Looser wrote:
"Dave Plowman (News)" wrote in message
...
In article ,
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.


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


David.



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.

d

Dirty Digital [sic.]
 

"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.

Dirty Digital [sic.]
 

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.

d

Dirty Digital [sic.]
 

On 2008-06-20, Jim Lesurf wrote:
In article , John Phillips
wrote:
In fact on the specific issue of digital processing with or without
dither and the effect on resolution in "reverb tails", since the CDP-101
had only analogue reconstruction filters there seems to be no
possibility to blame the player - only the CD mastering.

You having mentioned that made me check, and I can confirm that the
squarewave results in the HFN review of the CDP101 show no 'pre-ringing'. I
haven't found a detailed spec for the CDP101, and can't recall any details.

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

--
John Phillips

Dirty Digital [sic.]
 

On 2008-06-20, 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?

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.

--
John Phillips