Digital BW, The Print

HPA wrote:

>It is considered conventional wisdom that the ear cannot hear frequencies
>above and below a certain point, but that the existence of sound in those
>frequencies has an audible effect on what we can. Two examples are called
>intermodulation and harmonics.
>  
>
Intermodulation is caused by nonlinearities in the system and harmonics 
result from a fairly low spur free dynamic range in the old analog 
systems. You even find this in the concert halls where certain shapes 
and materials will produce similar phenomea plus such things as 
multipath effect as a reflected (and distorted) wave arrives at the ear 
slightly after the original.  Most of these effects were eliminated with 
digital signal processing and the CD format to reporduce the digitally 
processing signal faithfully. But yes the CD music does sound different. 
I didn't realize that there was an effect on mental patients.

I suspect that in the quest for different developers we are actually 
looking at a similar phenomena. For example are not developers that 
maximize the "edege effect" such as FX-1, or very dilute Rodinal taking 
advantage of local nonlinearities in the film?  I think it gets back to 
"fidelity."

Truman