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Hi Richard
Thank you, but just to explain our position. We have digitized from analogue audio cassettes to wav. file for preservation and intend to give access as mp3. However, before we do that we would want to redact all the confidential information in our recordings. What i would like to know is that:
1. If we have distorted the audio recording or  is there a way that the original distortion can be undistorted by using the same software(adobe audition in our case) if the audio file has been compressed from wav to mp3;2. If it can, what is the best method of voice distortion in adobe audition without affecting the file

Thanks for your assistanceIshumael

--- On Sun, 4/4/10, Richard L. Hess <[log in to unmask]> wrote:

From: Richard L. Hess <[log in to unmask]>
Subject: Re: [ARSCLIST] Voice Distortion
To: [log in to unmask]
Date: Sunday, 4 April, 2010, 3:45

Hello, Ishumael,

If I understand your question correctly, there was once a WAV file that was then encoded as an MP3 and the WAV file went away and now you wish to reconstruct it from the MP3. Is this a quick assessment of what you wish to do?

If it is, I'm afraid that the MP3 coding process throws away "inaudible" information or "barely audible" information, and I doubt there is any way of getting that back.

When you speak of "distortion" if that existed in the original, there are some "de-clip" algorithms that are marginally successful if the wind is blowing from the right direction in slightly removing some forms of clipping, but, all-in-all, the experience I've had with these have barely been worth the effort.

It would be best to somehow re-generate the original WAV files, preferably at 48 ks/s 24 bits for voice or 96 ks/s 24 bits for music.

Sorry.

Richard

At 04:58 PM 2010-04-03, you wrote:
> Dear colleagues
> I do hope I find you well.
> I would like ask for advice on the following:
> 1. Is it possible to undistort a recording that has been compressed from a wav file to mp3 and manage to listen to the original recording if one was to use the same software (adobe audition) to listen to the recording2.What is the best possible way of voice distortion in adobe audition.
> RegardsIshumael
> 

Richard L. Hess                   email: [log in to unmask]
Aurora, Ontario, Canada       (905) 713 6733     1-877-TAPE-FIX
Detailed contact information: http://www.richardhess.com/tape/contact.htm
Quality tape transfers -- even from hard-to-play tapes.