Videomaker – Learn video production and editing, camera reviews › Forums › Technique › Sound › Recording sound in a moving car? › Exactly, Amber. Omnidirect
Exactly, Amber. Omnidirectional microphones can “hear” from all, or many directions and are unique in their designations and direction. In the omnidirectional mic systems (not like the cardioid pattern) they are often “pressure sensitive” which does actually help keep their response to wind noise and vocal “plosives” down … and on rethinking your situation, perhaps what you have WILL do the job. Again, as Don suggests, test them puppies.
Unidirectional mics can tend to be “velocity sensitive” (perhaps a bit more sensitive to wind noise, etc.) However, as you ask, YES the unidirectional (what I previously referred to as directional) is also usually sensitive to sounds from ONE direction, so placement would be a key factor in the success of their use, and isolation of side noise … wind, etc.
The cardioid pattern, according to good ol’ Wikipedia, is a type of unidirectional mic sensitive to sound in a sort of heart-shaped pattern. And the hyper-cardioid pattern mic has a tighter front-end range of sensitivity with a smaller rear pickup range. There’s also the super-cardioid, probably the most selective of the cardioid patterns in unidirectional systems.