[sdiy] NE572

[Dave Magnuson]

----- Original Message ----- 
From: "Cornutt, David K" <david.k.cornutt at boeing.com>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Tuesday, November 13, 2007 10:25 AM
Subject: [sdiy] NE572


<snip>

> So, I was looking over some search results for circuits that
> use this part, and I came across a Phillips patent for some type
> of psychoaccoustic circuit that uses the 572.  As near as I
> can tell, it provides a very short (5 ms) emphasis to high
> frequencies in the input signal, when the signal crosses a
> certain level threshold.  The patent says nothing about what
> this actually does, in terms of perception, other than that it
> is an "attractive effect".
>
> So I'm trying to get my head wrapped around what this actually
> sounds like, and what it might be good for in a synth context.
> Anyone ever come across an implementation of this?


Hi David,

I'm wondering if this is similar to one of those BBE "Sonic Maximizers"? 
If it is, it makes the top end sound "smeary" to me.   I've played with one 
at the music store, and wasn't too impressed.    But literally thousands of 
those sonic maximizers have been sold.... so maybe you'll like it!

Maybe you could dig and try to find the schematic of a Sonic Maximixer and 
compare it to the patent.   If it's the same concept, I'm sure you'll be 
able to find a used one at a music store to try out (I see them for sale all 
the time)

Dave Magnuson