Why just divided in 2 and recorded below center?

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iguana13
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Joined: Thu Mar 21, 2019 5:26 am
Operating System: Windows 7

Why just divided in 2 and recorded below center?

Post by iguana13 » Sat Jun 22, 2019 7:48 pm

I am using a cassette recorder that copies to a mini SD card. This is what it looks like on Audacity. Sounds o.k. but why is it just 2 colors and below the zero?
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audacity 2 color below line.jpg
audacity 2 color below line.jpg (91.11 KiB) Viewed 101 times

kozikowski
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Re: Why just divided in 2 and recorded below center?

Post by kozikowski » Sat Jun 22, 2019 8:33 pm

That's likely a hardware error called DC Offset.

Audio is always supposed to average out to zero (middle) no matter how loud or what the sound is.


Screen Shot 2019-06-22 at 13.25.56.png
Screen Shot 2019-06-22 at 13.25.56.png (5.03 KiB) Viewed 99 times

Yours doesn't. If you absolutely have to use this tape player and interface, you can force it to work with a couple of tools.

Drag-select and cut off the tall blue sections at the beginning and end.


Screen Shot 2019-06-22 at 13.35.18.png
Screen Shot 2019-06-22 at 13.35.18.png (12.85 KiB) Viewed 94 times

Select everything remaining by clicking just right of the UP arrow to the left of the track.

Image

Effect > Normalize > [X] Remove DC (and don't select anything else) > OK.

You will have to do that to each tape or capture unless you repair the player or get a new one.

The blue colors in the wave are wrong or confused because sound doesn't normally do what yours does.

Koz

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