Dirty WAV - is it possible to fix?

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MolMagMan
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Dirty WAV - is it possible to fix?

Post by MolMagMan »

I'm trying to archive "Yes Prime Minister" (it's probably already done somewhere but I'm experimenting).
I've tried recording the WAV file a couple of times now but I think the tape is damaged.

20.12.30.22.28.54.png

As can be seen from the screenshot, blocks 1, 2, 3 and 4 are very messy. There are some other areas in the wav which are similar - basically there are about 10 blocks which fail to convert to UEF. It's a shame because the rest of the tape seems really clean :(

The wav files are here ... https://drive.google.com/file/d/1l-5C7H ... sp=sharing

Is there any way to fix this?

Thank you :)
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BigEd
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Re: Dirty WAV - is it possible to fix?

Post by BigEd »

I had a quick go with Audacity - see if the three blocks in the attached are any better.
(I did the same thing I did here.)
Attachments
yes_prime_minister_days_1_2-fix.wav.zip
(892.05 KiB) Downloaded 10 times
MolMagMan
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Re: Dirty WAV - is it possible to fix?

Post by MolMagMan »

Thanks BigEd :)

I get this when I import it into Audacity...

20.12.31.06.20.11.png

...and "WAV file not 8 bit" when I run it through makeuefam.

However - I equalised the original file as per your instructions, exported as unsigned 8bit pcm and it converted successfully - yay!
However - it doesn't load in b-em - boo :(
BigEd wrote:
Wed Dec 30, 2020 10:55 pm
I had a quick go with Audacity - see if the three blocks in the attached are any better.
(I did the same thing I did here.)
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BigEd
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Re: Dirty WAV - is it possible to fix?

Post by BigEd »

Ah, we must be a bit closer then... can you tell which block is bad when you load it?
mad
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Re: Dirty WAV - is it possible to fix?

Post by mad »

Fixing a corrupt /dirty WAV is almost impossible with a Machine Code data program.
zooming in and redrawing the wav peek has helped me in the past, where the volume had dropped out.
But i think that was more blind luck than skill. ;)

When the program is written in BASIC.
it is easier to spot the odd corrupt converted byte in the listing.

Anyway here is a working version, so you can hex compare your test results.
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yes pm.zip
(154.98 KiB) Downloaded 6 times
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vanekp
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Re: Dirty WAV - is it possible to fix?

Post by vanekp »

There is some strange sound in that recording I don't be-leave it will ever be readable with the interference that is in there. if a wave has drop out or interference like this the changes are very small you will ever make a working uef from it.
Peter.
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