Choosing Mic Patterns for Clear Speech

Match pattern to room

A mic's polar pattern shows how sensitive it is to sounds from different directions. Picking the right one for the space will do more for noise control than raising gain.

For speech in a noisy room, a tighter pattern helps. For a quiet controlled space, a broader pattern can sound more natural with less off-axis color change.

Common options for speech

Cardioid picks up mostly from the front and rejects sound from the back. This is a safe choice for one speaker in a room with some background noise.

Supercardioid and hypercardioid reject more side noise but pick up a small lobe from behind. They need careful placement to avoid picking up sound from behind the mic.

Omnidirectional picks up equally from all sides. It avoids proximity shifts but offers no rear or side rejection, so it works best in very quiet rooms.

Placement still matters

No pattern can fix bad placement. Keeping the mic close to the speaker gives a better signal to noise ratio and reduces room sound reaching the mic.

Aim the null or rejection zone toward the main noise source. For cardioid, the back null faces away from the speaker area noise. For tighter patterns, pay attention to the rear lobe.

Pattern choice gives rejection, but distance gives control.

Tradeoffs to know

Tighter patterns can sound less natural off axis and are more sensitive to small head movements. Omnidirectional avoids that but lets in more room sound.

Test two patterns if the mic allows it. Record the same line in the actual space and pick the one that sounds clearest with the least editing needed.

Key takeaways

• Use cardioid for most single speaker speech in mixed rooms.
• Try supercardioid only when side rejection is needed and placement is fixed.
• Keep distance short to improve signal to noise ratio.
• Aim rejection zones toward known noise sources.
• Pick based on test takes in the real recording space.