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ARSCLIST  April 2019

ARSCLIST April 2019

Subject:

Re: A weird fading in a recording?

From:

"Richard L. Hess" <[log in to unmask]>

Reply-To:

Association for Recorded Sound Discussion List <[log in to unmask]>

Date:

Thu, 25 Apr 2019 16:03:41 -0400

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (90 lines)

Hi, Eero,

What medium did you receive this recording on? You said a digitized 
copy, how was it digitized? Directly from the video tape or via a 
cassette copy of the videotape.

I have heard this type of magnetic record damage in analog audio 
cassettes where they were stored out of their jewel boxes in a drawer 
that contained magnets.

It is possible that this type of erasure could have occurred directly on 
the video tape.

Another thought, it could be poor-tape-to-head contact and you're 
hearing spacing loss. I doubt it's azimuth wander, but if the tape was 
physically stretched it might be (slim chance).

I think I'd attack this with the dynamic equalizer in Ozone--but no 
matter what you do it won't be high fidelity.

I did do one very messy thing where I made several copies and then let 
iZotope Neutron mix them, I think it did a passable job, but again, you 
can't put back what's there, just improve intelligibility. If this is 
music, well, that's too bad. It can sound a bit better. You might also 
try a bit of fix on the good stuff too for the access copy: reduce the 
highs a bit so the contrast isn't so bad. It might just be more listenable.

Good luck!

Cheers,

Richard

On 2019-04-25 12:14 p.m., Eero Aro wrote:
> 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 
> recording.
> 
> 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 on
> medium and long waves as well. But this recording was not recorded from 
> a radio,
> 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 
> amplifier
> 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 
> frequencies
> 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 
> area.
> 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 
> dropbox.
> https://www.dropbox.com/s/c0n4aojd2w3ou5w/Fading%20screenshot.jpg?dl=0
> 
> If anyone is interested to hear a sample of the recording, please email 
> me off-list.
> 
> Eero
> ----------------------------
> http://www.tonfiks.fi
> 

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

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