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Hi, Lou,

That is a good suggestion, but we already have an M-S thing going on as 
I explained in a previous email. All the noise is in the L-R channel 
which, unfortunately was mixed back into the quiet L+R channel when the 
stereo was demodulated in the tuner to make the tape recording. So, the 
act of summing L + R from the tape will act to cancel out the noise, but 
the balance between L + R will need to be tuned for minimum noise, as 
you know when you're trying to null things, 1-2 dB in level makes a big 
difference.

I haven't thought what subsequent M-S processing might do, but that 
would put it back into L+R and L-R and might be another way of looking 
at the same thing...just attenuating the S channel would work the same 
as summing, but the match is critical in either case.

Cheers,

Richard



On 2020-09-13 4:35 p.m., Lou Judson wrote:
> I wonder if an MS treament would help with multipath - EQ the side signal to reduce noise, bost the mid to compensate, then recombine. I don;t have a sample to try this on but it has worked for me for stereo noise in the past.
> 
> <L>
> Lou Judson
> Intuitive Audio
> 415-883-2689
> 
>> On Sep 13, 2020, at 1:16 PM, Lou Judson <[log in to unmask]> wrote:
>>
>> FM multipath? Good question. Have you tried it in mono? Mono-ing the receiver cleans it right up, but I don’t now about after it is recorded.

-- 
Richard L. Hess                   email: [log in to unmask]
Aurora, Ontario, Canada                             647 479 2800
http://www.richardhess.com/tape/contact.htm
Track Format - Speed - Equalization - Azimuth - Noise Reduction
Quality tape transfers -- even from hard-to-play tapes.