Definition
A microphone with a heart-shaped pickup pattern that is most sensitive to sound coming from directly in front of it, less sensitive to sound from the sides, and largely rejects sound coming from behind. This directional pattern makes it well suited to aviation use, where engine, slipstream, and cabin noise must be kept out of the transmitted signal.
Plain English
A microphone that picks up sound mainly from the front and ignores most sound from behind. This helps the pilot's voice come through clearly while blocking out cockpit and engine noise.
Context Anchor
Seen in aviation headset, intercom, and radio microphone descriptions, especially when discussing cockpit noise reduction and clear voice transmission.
Derivation
From the Greek 'kardia' meaning 'heart,' plus '-oid' meaning 'shaped like.' The name comes from the heart-shaped diagram used to draw the microphone's sensitivity pattern when viewed from above.
Why Pilots Care
It reduces unwanted cockpit and engine noise, producing clearer radio transmissions and voice recordings.
Analogy
It is like facing a flashlight toward the sound you want. The microphone is aimed at the pilot’s voice instead of listening equally in every direction.
Intuition Check
Cardioid does not mean the microphone is related to the heart. Here, it describes the heart-shaped area where the microphone picks up sound.
Example Sentence 1
Most aviation headsets use a cardioid microphone so the pilot's voice is picked up clearly while engine noise from behind is rejected.
Example Sentence 2
During the preflight check the pilot confirmed the cardioid microphone was positioned close to his mouth for best clarity.