11. Different channels are obtained by sum and difference of the figure-eight and cardioid patterns. 12. A parabola may also be characterized as a conic section with an inverse transform of a cardioid . 13. For Live Pop music concerts a more appropriate array for the pickup of ambience is the cardioid trapezium. 14. The pocket-sized Mikroport incorporated a dynamic moving-coil cartridge microphone with a cardioid pickup pattern. 15. The U47 was the �rst condenser microphone switchable between cardioid and omni-directional pick-up patterns. 16. The cardioid response reduces pickup from the side and rear, helping to avoid feedback from the proximity effect. 17. In electro-acoustics, these patterns commonly include omnidirectional, cardioid and hyper-cardioid microphone polar patterns. 18. In electro-acoustics, these patterns commonly include omnidirectional, cardioid and hyper-cardioid microphone polar patterns. 19. The first two equations determine that the point is within the cardioid , the last the period-2 bulb. 20. The array consists of 5 spaced cardioid microphones, 3 front microphones resembling a Decca Tree and two surround microphones.
