Enhancing click detection possible?

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Enhancing click detection possible?

Postby h4yn0nnym0u5e » Sun Dec 19, 2010 11:06 am

Hi Derek

Thanks for re-activating my account...

I've been processing a rather tricky file, and wonder if there's any possibility of beefing up the click detection so it can do even better than it currently does. The file in question is from some 78's, which I believe have been transferred once to reel-to-reel and then from that to cassette. Unfortunately I don't think the original 78's are still in existence. The good news is that they weren't terribly worn to start with, so we don't have "frying bacon" to contend with!

However, there do remain a fair number of perceptible clicks even after processing at max click threshold (5); they're audible to me, and clearly visible as vertical bars on the spectrogram display, but not being picked up by the click detector. I don't know if it's a consequence of loss of frequency response (there's very little energy in the raw .WAV above 5kHz), or two lots of tape hiss, or something else you'd understand better than me.

Scan time wouldn't be a problem for me, as I don't do many files these days. I wonder if it would be useful to have a "scan and classify" pass, and then a separate "apply" pass (possibly on either a block or the whole file) so the user could quickly decide, e.g. after an overnight scan run, what fierceness of correction to use?

I could send you a snippet of the file if that'd help.

Best regards

Jonathan
h4yn0nnym0u5e
 
Posts: 5
Joined: Sat Oct 20, 2007 9:50 pm

Postby Derek » Mon Dec 20, 2010 9:20 am

Hello Jonathan

Yes the transfer to tape and cassette will have severely reduced the effectiveness of the click detector. The detector looks for sharp leading edges but the transfer to tape will have smoothed these out. By all means send me a sample and I'll see if any improvements can be made. If you can see the clicks on the spectrogram display then it should be possible to automatically detect these. But I suspect it will be quite a challenge!

If you're just sending a short clip then you should be able to send it as an email attachment. If this isn't possible I can give you access to our upload site. Just let me know if you need this.

best regards
Derek Higgins
Wave Corrector Developer
http://www.wavecor.co.uk
Derek
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Posts: 476
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Location: Coleshill, United Kingdom

Postby h4yn0nnym0u5e » Mon Dec 20, 2010 10:08 pm

Hi Derek

Thanks for that. I've isolated a short chunk, and done a default session plus one with some manual corrections; zipped it's just under 3Mb, is that OK for you by email?

Best regards

Jonathan
h4yn0nnym0u5e
 
Posts: 5
Joined: Sat Oct 20, 2007 9:50 pm

Postby Derek » Mon Dec 20, 2010 10:10 pm

Yes that should be OK
Derek Higgins
Wave Corrector Developer
http://www.wavecor.co.uk
Derek
Site Admin
 
Posts: 476
Joined: Sat Jan 01, 2005 7:57 pm
Location: Coleshill, United Kingdom

Postby h4yn0nnym0u5e » Mon Dec 20, 2010 10:23 pm

Email sent, with attachment. Good luck!
h4yn0nnym0u5e
 
Posts: 5
Joined: Sat Oct 20, 2007 9:50 pm


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