[78-L] Removing hiss - yet another idea

[Michael Biel]

This was done over 35 years ago by Richard Burns and David (?) Packard 
in a device called the Packburn.  It had a switching circuit which 
selected the quieter of each groove wall, and then was improved to use 
the combined pair when both are equal.  You could watch the lights 
following the action.  Following the switcher it had a blanker which was 
an impulse de-clicker which removed the click and interpolated the 
missing sound with what preceded and followed it. 

And this was long before our mutual friend Lloyd Stickles developed the 
original idea that became CEDAR.  I was at early presentations of all of 
these devices.

Mike Biel  mbiel at mbiel.com

Mark L. Bardenwerper, Sr. wrote:
> John Wright wrote:
>   
>> When I'm restoring I start with a stereo file and sometimes see noise in 
>> one channel and not in the other, which is useful, cut'n'paste the good 
>> bit.
>>
>> Now,
>>
>> David Burnham wrote
>>
>> "the main problem with all noise reduction systems: how do you 
>> distinguish between signal and noise? "
>>
>>
>> That got me thinking. If you have two 78s of the same recording the 
>> music is the same, but the noise is different, and likely different all 
>> the way through.
>>
>> So has someone invented a computer program that compares the two 
>> recordings and just saves the sound that is COMMON to both? i.e. the 
>> music?
>>
>> Let me have a share in the new patent, please :o))
>>   
>>     
> Isn't that pretty much the same as declicking a mono recording saved in 
> stereo, then combining the 2 tracks?
>
>