US Patent 10187721 Weighing fixed and adaptive beamformers

A beamformer system that can isolate a desired portion of an audio signal resulting from a microphone array. A fixed beamformer is used to dampen diffuse noise while an adaptive beamformer is used to cancel directional coherent noise. A gain is calculated using a signal quality value such as signal-to-noise ratio, signal-to-null ratio or other value. The adaptive beamformer output is adjusted by the gain prior to combining the fixed beamformer output and the adaptive beamformer output to determine the output audio data.