Audacity Forum

Like the left side of this...

http://kozco.com/tech/audacity/pix/DCOffset.jpg

...except yours goes up instead of down?

That's DC Offset or battery voltage mixed into your show. It's an electronic mistake and your soundcard may be broken.

Koz

That's more better. I went as far as I could go without gargling up the voice. Before: http://www.kozco.com/tech/audacity/clips/fan_noise_clip.wav After: http://www.kozco.com/tech/audacity/clips/fan_noise_clip_after.wav That's it. I applied a 150 Hz high pass filter to get rid of the lion's share of...

Who made the microphone and what is it? You're on a Windows machine, right? Sound Insanity on a Windows machine can be caused by Windows trying to "help" you with sound management. Make sure the extra services are turned off. Windows Enhanced Sound http://forum.audacityteam.org/viewtopic.p...

This is the Audacity Equalizer with the "Graphic Eq" view selected:

Which is apparently Windows-only.

Koz

I can't think of a way to automate it, but we may be able to make the manual method easier. How are you doing it now? I would create a silent clip and "Copy" it. Zoom into the first of the lecture. Drag-Select, Control-E ( on a PC). Find the first voice and select to the beginning of the r...

Cool. Post the location of one so we can try it.
Koz

Like the left-hand side of this illustration... http://kozco.com/tech/audacity/pix/DCOffset.jpg That's DC offset and you can get rid of it with the Effect > Normalize tool. Just take the DC out, don't let the tool do anything else. You have to fix this before you start editing with that material. On...

I thought there was another variation to this...
Unfortunately, that's an Apple/Mac tool.

Koz

I have another one or two. The first illustration above gets rid of nails-on-the-blackboard screechy sounds.

This next one was is designed to get rid of the sound a metrobus makes as it goes by outside your house. Low rumble.

http://kozco.com/tech/audacity/100Hz_Rumble.jpg

Koz

I'd probably start with the Equalizer tool. Effects > Equalizer The line down the middle is a rubber band and you can grab it with your mouse and push it around. Up is louder. http://kozco.com/tech/audacity/voiceEq.jpg This is a very simple three-point equalization. Put lumps up and down from left t...