Choosing a Polar Pattern (Part 2)

  The bidirectional (you have another hint with ‘bi’-two) pattern is when a microphones diaphragm is equally sensitive in the front and the rear, while rejecting sounds from the sides. As you can see in the diagram the pattern looks like a figure 8, which is why it is sometimes referred to as a figure 8 pickup pattern.

  Bidirectional microphones are great for capturing duets either with vocals or instruments, as well as face-to face interviews. Just be sure and position the pattern of the figure 8 so that the musicians in the duet, or interviewees, are in the prime pattern area for vibration detection.

  As you can guess from the other patterns names, this pattern is also spelled out in its name. ‘Omni’-meaning all or unlimited, is a pickup pattern that collects vibrations equally from all directions. Unlike a cardioid mic (unidirectional), where you want to isolate specific sounds while blocking out ambient noise, the omnidirecitonal pattern captures the room resonance covering 360 degrees of sound vibrations.

  Boundary microphones are great for vocal groups, ambient noises, sound effects, and realistic live recordings. However, since you are picking up the boundary of an area feedback is easy to get. So, be sure and test any omnidirectional mic placement before you use it.

If you’re interested in more detailed information involving different pickup patterns check this video out: Polar Patterns - Microphone Specifications

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