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

摘要

An acoustic device is provided with first and second one or more acoustic elements to generate a first signal that includes mostly undesired audio and substantially void of desired audio, and a second signal that includes desired as well undesired audio respectively. The first one or more acoustic elements are designed and arranged to generate a Cardioid beam with a null at an originating direction of the desired audio. The second one or more acoustic elements are designed and arranged to generate a complementary beam that includes the desired audio. A system is provided with an appropriate signal processing logic to recover the desired audio using the first and second signals. The signal processing logic may practice echo cancellation like techniques or blind signal separation techniques.

主权项

1. 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, wherein the conditioning is based on; whether desired audio is detected, whether the first signal is active, and whether the second signal is active.