Parameter selection for audio beamforming

摘要

An audio beamformer receives signals from microphones of an array and processes the signals to produce a directional audio signal that emphasizes sound from a selected direction. The beamformer is implemented using weights or other parameters that are calculated to account for effects upon the received audio signals by the surfaces upon which the microphones are positioned.

主权项

1. A method comprising:
receiving multiple frequency domain input signals, each input signal corresponding to a microphone of a microphone array, wherein each microphone is on a surface; selecting a focus direction; determining a correction vector for a first input signal corresponding to a first microphone of the microphone array, the correction vector indicating magnitude differences and phase differences at multiple frequencies of the first input signal caused by the surface in comparison to a free-field input signal that would be produced by the first microphone in free space in response to a sound wave arriving from the focus direction; calculating filter weights corresponding to the multiple frequencies of the first input signal based at least in part on the correction vector and based at least in part on the focus direction; multiplying frequency components of the first input signal by the filter weights to produce a first filtered signal corresponding to the first input signal; and summing multiple filtered signals corresponding respectively to the input signals to produce a directional frequency domain signal, the multiple filtered signals comprising the first filtered signal.