Patent ID: 9456275
Filing Date: 2016-09-27
CPC Classification: G10L,H04R

Claim Text:
1. An acoustic system comprising; a first omni-directional acoustic element, the first omni-directional acoustic element outputs a signal that contains desired audio and undesired audio the signal is provided as a primary channel to a signal extraction component; a second omni-directional acoustic element, the second omni-directional acoustic element outputs a second signal that contains the desired audio and the undesired audio, the first omni-directional acoustic element and the second omni-directional acoustic element are separated by a distance along an expected direction of desired audio; a delay, the second signal is coupled to an input of the delay; an amplifier, an output of the delay is input to the amplifier; and an adder, an output of the amplifier is coupled to a first input of the adder, the signal is coupled to a second input of the adder, the adder subtracts the first input from the second input to produce an output which has a cardioid beam pattern which has a null in the expected direction of desired audio and is substantially free of the desired audio, the output is provided as a reference channel to a signal extraction component.