CARDIOID BEAM WITH A DESIRED NULL BASED ACOUSTIC DEVICES, SYSTEMS, AND METHODS

摘要

An acoustic system includes first one or mole acoustic elements designed and arranged in a first manner to facilitate generation of a first signal that includes mostly undesired audio, substantially void of desired audio, in response to a presence of the desired audio and the undesired audio. Second one or more acoustic elements are designed and arranged in a second complementary manner to facilitate generation of a second signal that includes both the desired and the undesired audio, in response to the presence of the desired audio and the undesired audio. A signal extraction component receives the first signal and the second signal. The signal extraction component further includes an inhibit component. The inhibit component is coupled to the first signal and the second signal. A delay element is coupled to a path of the second signal. The delay element introduces a deterministic delay to the second signal. A value of the deterministic delay is selected to model reverberation of the environment that the system is used in. The first signal is input to the adaptive filter and an output of the inhibit component is in communication with the adaptive filter to control adaptive filtering. An output of the adaptive filter is a first input to an adder and the output of the delay element is a second input to the adder. The adder subtracts the first input from the second input to create an output, which is the desired audio.

主权项

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.