I make background music then record my vocals then render all this. And i have what you can see there: 1. http://s22.postimg.org/s4crdm6tt/image.png 2. http://s13.postimg.org/4xgr16o9z/image.png
I think it is called DC Offset. And this happend maybe because i used while recording very cheap mic. I don’t know. How to avoid wave like this, how to make it normal? Watch screens!
Yes that is DC offset.
Unless you are using a USB mic it is more likely to be due to the sound card than the microphone - it is a common problem with built-in sound cards.
DC offset can be corrected using the Normalize effect http://manual.audacityteam.org/o/man/normalize.html
Note that this does not actually “fix the problem”, it just moves the audio so that it is centred correctly. When audio is badly off-set, it will “clip” (distort) more easily because one side of the waveform is closer to the edge of the track than the other. The waveform should never touch the edge of the track because the edge is the “0 dB limit” which is the level at which nasty digital distortion occurs.
Thank you