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I wrote a little microphone array simulator in JavaScript.

I wanted to create an array with a cardioid response. One text I found said I should get that if I combine omni and figure-eight microphones, but that didn't work.

Another text said you needed to make a figure-eight microphone with a delayed rear port.

This is the 20 - 20000 Hz polar pattern of a two-microphone array, with the elements spaced 2 cm apart, with one element inverted and time-delayed by 2 cm.