Richard and Lou, Thank you very much for the ideas. You've given me back some hope for these tapes. I was using RX7 spectral de-noise, but it was leaving too much residual noise, and I couldn't push it further without losing content and creating artifacts. It seems I need to be a bit more adventuresome in my experimentation. I have RX7 advanced, so the upgrade cost to 8 advanced is not too terrible Will let you know if I am successful using what you have suggested. chuck find some non-destructive ways of On 9/13/2020 1:48 PM, Richard L. Hess wrote: > 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. > -- Charles Reinsch KRAB Archive: www.krabarchive.com