Help! Waveform shifted down capturing from cassette?

  • Thread starter Thread starter Dgold
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Dgold

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Hello! My first post here.

I have recorded my friend's radio show from FM to analog cassette. Now I am playing back the cassette tape, through a 1/8" cable, into my soundcard. I am capturing the audio using CD Wave, and Cool Edit Pro. I know how to do all that.

My question is here: The waveform appears to be shifted "down" below the center line. It is even, the levels are fine, but it just appears that the center of the waveform is below the normal center line. How can I correct this?

What causes this? Is it because I recorded from FM, a compressed signal, or is it something to do with the analog tape and the playback (possibly having incorrect speed due to the jambox?)?

My only guesses: is that the recording is "out of phase" or "phase shifted." I searched for those terms, but only found ways to create phase shift, not to correct it. Ahh, another word that I think might be related to this problem is "azumith" or something like that. In the old days we would adjust a screw on the tape deck to fix the azumith (spell?) so tapes would play more accurately.

Thanks for any help! :confused:
 
Sounds like you have a "DC Offset" problem. I'm not familiar with Cool Edit but look around in it to see if it has DC Offset correction/adjustment. Do a search here for DC Offset since it has been discussed several times. Might have to search for Offset because I think you have to have at least 3 characters in a word for search to work.

DD
 
Thanks for the replies. I will search around for "DC Offset."

If anyone else has additional advice please post here.
 
Nah, it's most probably DC Offset. From memory, I think Effects - Amplitude - Amplify has a DC Offset checkbox. Just amplify 0db and put a check in the box.
 
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