What is a voiceover?
A voice-over is like a narration.
If you can hear a voice, but it is not from a visible character or person, then it will be a voice-over.
Voice-overs are used in a range of forms of media. They are most commonly used in advertisements and film trailers.
What should you consider when recording a voiceover?
Background noise level.
Microphone choice:
Microphone type.
Frequency response.
Polar Pattern.
Proximity to microphone.
Plosives.
Reflectiveness of the room.
Why is background noise a problem when recording?
The voice is a relatively quiet sound.
If you are recording in loud environment, you will run into problems when trying to process the voice-over in your DAW.
It is likely that the background noise could be too loud at certain points.
The signal to noise ratio will only get worse once compression is added.
How can you minimize background noise when recording?
Simple solutions:
Close windows.
Turn off air conditioning/fans.
Turn off any unnecessary electrical equipment.
Use the null of a polar pattern to reject noise.
Complex solutions:
Soundproof room (room within a room).
Isolation booth.