Hi Eero, I always prefer to have access to the original videotape and make
my own transfer. It sounds like an azimuth alignment/stability issue,
possibly spacing loss, or even tape damage but cant be sure. VHS and Beta
linear audio can be very unforgiving in this respect. Feel free to email an
----- Original Message -----
From: "Eero Aro" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, April 26, 2019 12:14 AM
Subject: [ARSCLIST] A weird fading in a recording?
> Hi All
> My customer has a digitized audio copy from an old video tape.
> I haven't faced this kind of a problem before and cannot find a solution
> to it.
> There is a fading in the high frequencies at a rate of about 1,5 to 2 Hz,
> the rate is not steady, it varies and it appears only in parts of the
> The high frequencies have been repeatedly attenuated and attenuation
> affects down to 6 kHz at places. There is high frequency content in the
> recording up to about 15 kHz.
> This sounds very similar to a fading interference that I heard a lot on
> the shortwave
> when I was listening to SW bands as a radio amateur. Similar fading occurs
> medium and long waves as well. But this recording was not recorded from a
> it has been copied from a video tape. I don't know if the audio tracks
> have been linear
> analog tracks on the tape.
> Another way I can try to describe the fading is that you would turn your
> gain knob up and down, but the damping would only affect high frequencies.
> It is a bit like a longish "dropout" or a fade-out, but the shape of the
> in the fade is different to a fade-out in a quarter inch tape.
> Does anyone know a way to fix this? I have tried using the Spectral Repair
> tool in RX with no success. It is difficult to define such an area, around
> which the tool could interpolate stuff into the variably shifting damped
> Also, doing it in smaller pieces doesn't work too well.
> There is a screenshot of a four second sample of the spectrogram in my
> If anyone is interested to hear a sample of the recording, please email me
This email has been checked for viruses by Avast antivirus software.