cardioid

n.

心脏线；（灵敏度模式呈心形的）定向麦克风；

adj.

心脏线形的；（麦克风）灵敏度模式呈心脏形的；

Stepped cardioid bearing system
Stepped cardioid bearing system
Inverted cardioid wankel engine
OMNI-STEERABLE CARDIOID ANTENNA
Cardioid graph based ECG biometric recognition incorporating physiological variability
Spectral Statistics in the Quantized Cardioid Billiard
Edge Diffraction, Trace Formulae and the Cardioid Billiard
Symbolic Dynamics and Periodic Orbits for the Cardioid Billiard
A Novel Slots-and-Monopole Antenna with a Steerable Cardioid Pattern
Modal Analysis and Waveguide Dispersion of an Optical Waveguide Having a cross-section of the Shape of a Cardioid