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ARSCLIST  June 2018

ARSCLIST June 2018

Subject:

Re: Processing micro cassette audio using iZotope RX5

From:

Tim Gillett <[log in to unmask]>

Reply-To:

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

Date:

Sat, 23 Jun 2018 10:42:16 +0800

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (125 lines)

Hi Dan,

Thanks for uploading the unprocessed audio sample. That really helps. Your 
azimuth alignment seems pretty  good. There's a
bit of azimuth wander but that's to be expected with a slow speed
microcassette track.

Automatic solutions are not ideal. The best approach is to identify each 
particular type of unwanted noise in
the recording and then attempt to remove each of them, one at a time, with a 
dedicated tool.
So with that in mind...

1. Hum.
There's a mild hum with a fundamental of around 149 Hz and a total of four
or maybe five harmonics above that. Probably caused by the cassette 
recorder's motor
and transport. I was able to greatly remove them with my  Acon DeHum tool.

With similar settings you should be able to do the same in RX Dehum.

2. Random noise.
Unfortunately the hum is not the main issue. As you mentioned there's a lot 
of
random noise, and worse of all, right in the critical voice band. That  is 
the worst
kind to remove, often impossible.  My approach is always to filter out 
everything below the
lowest recorded speech frequency, and above the highest.  In this case I low 
pass filtered at about 300
Hz,  and  high pass filtered at about 3000Hz, both with a Q of about 5.
It gave a mild improvement in listenability without degrading the wanted 
voice.

Your Corrective EQ tool sounds like the equivalent tool in RX.

3.Clipping.
I hear some sort of ugly distortion  on voice peaks.  Its
spectrum  goes up to at least 10kHz. I doubt it's on the
microcassette tape. Possibly when you transferred, the playback volume on 
the GE was too high and
it was clipping its internal amplifier. Try lowering the GE's playback
volume to  where the clipping stops. But dont go too low as there may be a
low level noise from the GE's amplifier (the hum?) which you want the tape's 
own
content to mask. Somewhere in the middle is usually the best.


You might try RX's Declipping tool but as mentioned I would first check the 
distortion isnt caused by the playback/recording chain.

4.  I didnt  attempt to use a Denoiser/Dialogue Denoiser and that was 
intentional.

Hope this helps Dan,

Tim Gillett
Perth,
Western Australia





----- Original Message ----- 
From: "Dan Gediman" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, June 22, 2018 11:42 PM
Subject: Re: [ARSCLIST] Processing micro cassette audio using iZotope RX5


Thanks, everyone for all your input so far. Some info that might help 
clarify things. The unit I’m using is a GE micro cassette tape 
player/record, NOT a mini cassette. Second, removing the tape and 
transferring it to a standard cassette is not an option here, as I have to 
return these tapes as is to their owner. Lastly, the unit has a mono 
mini-plug earphone jack and the recording itself is mono. And I’ve already 
adjusted the azimuth to the best of my ability using my ear. I don’t have 
access to a meter to check precisely (unless someone can suggest a software 
meter that would work).

As far as RX5, I have used the De-noise module in spectral mode, feeding it 
a sample of the background noise. It has made it substantially better, but I’m 
trying to see if I can make it ever better. I also experimented with the 
presents of the corrective EQ module. I haven’t tried the Spectral Repair 
option, because frankly I’m not sure how to use it properly. If you think it 
could help, I’ll go online and find some tutorial videos to bring me up to 
speed. Ditto for any of the other RX5 modules that you think might help 
(de-clipping has been suggested, as has de-reverb).

Since I assume most of you have upgraded to RX6, here are the available 
tools in my version of RX5:

De-clip
De-click
De-hum
De-noise
Spectral Repair
De-reverb
Gain
Corrective EQ
Channel Ops
Resample
Dither

Someone asked if I could upload an audio sample. I’m not sure how to do that 
in a listserv, so I have uploaded a raw, unprocessed sample to Google Drive 
here: https://drive.google.com/open?id=1NuYkyKK6yNXzDRtOA_ZUHuYzf6VCAwuK 
<https://drive.google.com/open?id=1NuYkyKK6yNXzDRtOA_ZUHuYzf6VCAwuK>. 
Anything else you think I should try, hearing the file and knowing what I 
have already tried?

Thanks again!
Dan

Dan Gediman
502 299-2565
[log in to unmask]
www.dangediman.com <http://www.dangediman.com/> 


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