cardioid

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car·di·oid

(kar'dē-oyd),
Resembling a heart.
[cardi- + G. eidos, resemblance]
References in periodicals archive ?
The pattern shown in Figure 1B illustrates a cardioid (heart-shaped) type.
The dipolar pattern of this kind of microphone allows it to usually have a more consistent on and off axis response than the cardioid design and all but the best omnis.
Tenders are invited for Microphone With Chord Complete Set Should Have Outstanding Speech Intelligibility, Cardioids Dynamic Microphone, User Friendly Shure Model No Sm58 , Make Sennheiser, Samson, Shure Only