Author Topic: [TUBE] Compander circuit (FYI)  (Read 2349 times)

puretube

[TUBE] Compander circuit (FYI)
« on: June 22, 2005, 10:27:29 AM »
Accidentally, this noise-reduction patent was filed 81 years ago  :shock:
(same age as the late chip-inventor Kilby...)

http://v3.espacenet.com/origdoc?DB=EPODOC&IDX=US1737830&F=0&QPN=US1737830#

btw: http://www.pat2pdf.org/ doesn`t fetch it...  :roll:

GFR

Re: [TUBE] Compander circuit (FYI)
« Reply #1 on: June 22, 2005, 12:11:19 PM »
Quote from: puretube
Accidentally, this noise-reduction patent was filed 81 years ago  :shock:
(same age as the late chip-inventor Kilby...)

http://v3.espacenet.com/origdoc?DB=EPODOC&IDX=US1737830&F=0&QPN=US1737830#

btw: http://www.pat2pdf.org/ doesn`t fetch it...  :roll:


You may want to try again - I've just downloaded it from pat2pdf...

puretube

[TUBE] Compander circuit (FYI)
« Reply #2 on: June 23, 2005, 06:51:56 AM »
I tried a different one:  :wink:

http://www.pat2pdf.org/patents/pat2313096.pdf

Skreddy

[TUBE] Compander circuit (FYI)
« Reply #3 on: June 23, 2005, 12:26:29 PM »
Seems to hinge on the "nonlinear resistor" element.  Could we focus and expand on that, please?  I think he describes basically a lossy, easily-saturated transformer.  I get the easily-saturated part (just go very light on the iron); how 'bout the lossy part, to attenuate what is essentially background noise for guitar use?  An element such as this has obvious application in high-gain distortion pedals where noise comes very high on the list of things that constrain our designs.  I find that using ceramic coupling capacitors tends to add a nice bit of lossiness and thus noise reduction, but I'd like to find something more profound.  I don't know; inline diodes would sort of work, but they'd have to be presented with a signal where the "noise" is just below the forward-voltage threshold and the signal is just above it.  What do you have in mind, Tube?  Like maybe a wrapping of paper between the wires and the iron core to reduce the signal-tranfer efficiency?

puretube

[TUBE] Compander circuit (FYI)
« Reply #4 on: June 23, 2005, 12:48:55 PM »
these 2 files were actually just meant to show the pre-NE570 series
state of the art...

Skreddy

[TUBE] Compander circuit (FYI)
« Reply #5 on: June 23, 2005, 01:21:58 PM »
I still want to play with low-tech ideas, though!   grumble grumble...

puretube

[TUBE] Compander circuit (FYI)
« Reply #6 on: June 27, 2005, 07:39:47 AM »
(little off-topic) :  
AAHHH... BTW: did you happen to have missed the 8th post on this page:
http://diystompboxes.com/sboxforum/viewtopic.php?t=23342&start=45  :?:

ouch...
 :shock:
 :oops:
 :roll:

Quote from: Skreddy
http://skreddypedals.com/

:>  http://skreddypedals.com/skreddy_pedals_ernie.htm

Skreddy

[TUBE] Compander circuit (FYI)
« Reply #7 on: June 27, 2005, 06:09:24 PM »
Is your pedal a tribute to Ernie Isley too?   :twisted:  :P  I tried to contact him via his agent to give him a free pedal, but no reply yet...

Kinda hard to find names nobody else either has used or is planning on using, eh?

I noticed recently that MI Audio recently released a "Neo Fuzz", while PedalworX had already had a "Neo Drive" on the market for some time.  As I recall, nobody on either side has had a problem about it.

puretube

[TUBE] Compander circuit (FYI)
« Reply #8 on: June 27, 2005, 06:24:01 PM »
He`ll get it next time the Bros play in our area,
or through our mutual friend Larry Graham,
or...

Skreddy

[TUBE] Compander circuit (FYI)
« Reply #9 on: June 27, 2005, 07:41:05 PM »
Quote from: puretube
He`ll get it next time the Bros play in our area,
or through our mutual friend Larry Graham,
or...

Can I send one of my "Ernie" pedals to you to re-route to Ernie??  That would be awesome!  (I'll pay the postage, and you can check it out yourself of course before sending it along...)