NewYorkDave

Automatic Gain Control, circa 1950
« on: January 09, 2005, 06:15:10 PM »
Hot off the ol' scanner:

2.2Meg PDF

Thanx to PRR for the webspace to host the file.


Mark Burnley

Automatic Gain Control, circa 1950
« Reply #1 on: January 09, 2005, 06:37:53 PM »
Thanks Dave,

And thanks for the other stuff you've put up recently- lots to read.

Your generosity knows no bounds!

 :green:

Mark
O_O tape is life O_O

gary o

Automatic Gain Control, circa 1950
« Reply #2 on: January 09, 2005, 07:11:34 PM »
Yes thankyou i"ll enjoy reading that.

clintrubber

Automatic Gain Control, circa 1950
« Reply #3 on: January 09, 2005, 07:38:20 PM »
Thanks a lot - appreciating all those scans you're providing !

regards,

   Peter

ebartlet

Automatic Gain Control, circa 1950
« Reply #4 on: January 09, 2005, 07:42:06 PM »
Thanks! Cool Article!

...and then sometime in the future, tv commercial producers discovered they could increase the average sound level of their commercials while staying within peak limits so we wouldn't miss a word while grabbing a snack or going to the john...
Eric

Eric's Audio Repair
http://amprepairnashville.com

NewYorkDave

Automatic Gain Control, circa 1950
« Reply #5 on: January 09, 2005, 07:53:09 PM »
Reading that article gave me a chuckle, 'cause I'm a broadcast engineer and it's funny to consider how some of the fundamental problems (e.g., people calling up master control and *****ing about levels) haven't really changed in 55 years.  :green:

ebartlet

Automatic Gain Control, circa 1950
« Reply #6 on: January 09, 2005, 08:52:40 PM »
The article mentions this circuit was designed to automatically bypass the limiter on very sharp peaks, such as the sound of a gunshot.  Did this become typical of broadcast limiter design?

Seems like I saw a gain reduction plot of a LA2A somewhere.  The plot showed that the output would increase again past the limiting part of the curve if the input signal was high enough.  Is this the same idea here?  In the LA2a was this high level "limiter bypass" a property of the photo resistor or another part of the side chain?
Eric

Eric's Audio Repair
http://amprepairnashville.com


 

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