[78-L] stereo/mono and noise reduction

[David Lennick]

This doesn't answer your question, but there's another trick I learned years 
ago from an "audio for idiots" column which advised using a Surround System 
Receiver and taking the mono audio from the dolby pro logic, which would result 
in a quiet sound from otherwise noisy mono discs. He was talking about 45s but 
I got myself one of those units and it immediately proved to be wonderful on 
78s, especially reducing rumble on laminated Columbias. (If someone needs a 78 
transferred in stereo, I go back to the stereo output..this also enables me to 
do a cross fade if one side of a groove is noisier at the start and the other 
side is noisier at the end.)

dl

On 11/4/2011 2:49 PM, Rodger Holtin wrote:
> Recently made a CD of some antiques for one of the kids at the university radio station and burned the wrong file for one of the tracks.  He noticed it was a lot noisier than the others.  True.  I usually record digitally in stereo then apply a+b= mono somewhere in the process of noise reduction and/or EQ tweaking before I call it done.  Anyway, we ripped that track to a computer, applied the a+b with his audio editor and voila! - quiet!  That is a lot more noticeable with headphones than monitor speakers, but still sometimes quite dramatic no matter how you're listening.
>
> I picked up on that a+b trick back in the 1960's when I read some article about phase distortion in relation to 78s.  That's been decades ago.  For awhile I had a tuner that would mono a stereo FM broadcast and that would help even those noisy signals.  (I sure miss it.)  Can somebody give us a good description of how and why that works for 78s and/or FM?
>
> Rodger
>
> For Best Results use Victor Needles.
>
> .