Cardioid beam with a desired null based acoustic devices, systems and methods

A method, comprising:

• generating a first signal that includes mostly undesired audio, substantially void of desired audio, and a second signal that includes both the desired and the undesired audio;
• extracting the desired audio using the first signal and the second signal, wherein the extracting further comprises filtering and adapting the filtering;
• and
• conditioning the inhibition of at least one of filtering and adapting the filtering, during the extracting, in order to avoid cancellation or distortion of desired audio from the second signal.

An apparatus, comprising:

• a first omni-directional acoustic element, configured to output a signal that contains desired audio and undesired audio;
• a second omni-directional acoustic element, configured to output a second signal that contains desired audio and undesired audio;
• and
• a circuit comprising:
• a delay and an adder, the delay imparts a time delay to the signal to create a delayed signal and the adder subtracts the delayed signal from the second signal to provide a first signal, wherein the first signal contains mostly undesired audio, substantially void of desired audio.