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add an omni pattern to a cardioid mic (is this possible)?
Old 7th October 2019
  #1
Gear Maniac
 

add an omni pattern to a cardioid mic (is this possible)?

Hello,

I believe cardioid takes two signals and does something with the phase to produce the cardioid pattern.

Is it possible to modify the signal/electronics so it produces an omnidirectional pattern? The Manley Reference Cardioid is cardioid only. It would be great if there was a modification that either converted it to omni only or a switchable cardioid/omni. I don't know if this is possible, or if the sound would be bad because the electronics are not optimized for a modification to omni.
Old 7th October 2019
  #2

It may be possible (depending on the capsule configuration).

Often, Cardioid-only capsules have only one diaphragm that has a film. So, you can't get any other pattern because there is only one signal.

If you want to make a box that will absorb sound, you could put a cardioid mic at a small opening in the box and create an omni mic mechanically.....




-tINY

Old 4 weeks ago
  #3
Lives for gear
Many cardioids are omni capsules, with tuned port(s) on the rear... often looking like a perforated stripe down the side, or holes on the back. Sound coming from the back gets through the port, travels the internal space, and cancels some of the sound hitting the front. (Better explanation here.) Sound coming through the front can still go around the mic to the rear port, but it has a longer path to travel around the outside of the mic before it gets to the port. Timing and attenuation over distance mean the front sounds don't get canceled as much.

You can watch an amateur destroy a cardioid's mic pattern by cupping their hands around the head, the way they would around their ear to make it more directional. If they block the ports while they're doing it, the mic becomes more omni... and can even be more prone to feedback, depending on the room.

So if you block the ports intentionally, the cardioid mic will become more omni. It'll also probably affect the frequency response of the mic. But worth a try.

This is for -most- cardioids. Multi-pattern mics often have dual elements, and add or subtract their signals to get different patterns.
Old 4 weeks ago
  #4
Gear Maniac
 

Thanks guys, great information.

I know mics like the u87ai use two elements to get the various patterns. I'm thinking the Manley Reference Cardioid might only have one element. If they put two elements in there, it might completely change the electronics and the sound of the mic.
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