Headset and a method for audio signal processing

摘要

A headset and a method configured to process audio signals from multiple microphones, comprising: a first pair of microphones (101,102) outputting a first pair of microphone signals and a second pair of microphones (103, 104) outputting a second pair of microphone signals; a first near-field beamformer (105) and a second near-field beamformer (106) each configured to receive a pair of microphone signals and adapt the spatial sensitivity of a respective pair of microphones as measured in a respective beamformed signal (XL; XR) output from a respective beamformer (105; 106); wherein the spatial sensitivity is adapted to suppress noise relative to a desired signal; a third beamformer (107) configured to dynamically combine the signals (XL; XR) output from the first beamformer (105) and the second beamformer (106) into a combined signal (XC); wherein the signals are combined such that signal energy in the combined signal is minimized while a desired signal is preserved; and a noise reduction unit (109) configured to process the combined signal (XC) from the third beamformer (107) and output the combined signal such that noise is reduced.

主权项

1. A headset configured to process audio signals from a first pair and a second pair of microphones arranged in a respective first and a second end-fire configuration aimed towards the mouth of a user wearing the headset in a normal position, comprising:
a first pair of microphones outputting a first pair of microphone signals and a second pair of microphones outputting a second pair of microphone signals; wherein the first pair of microphones are arranged with a first mutual distance and the second pair of microphones are arranged with a second mutual distance, and wherein the first pair of microphones are arranged at a distance from the second pair of microphones that is greater than the first mutual distance and the second mutual distance at least when the headset is in normal operation; a first beamformer and a second beamformer configured to respectively receive the first pair and second pair of microphone signals and perform respective near-field beamforming focussed on the mouth of a user wearing the headset; a third beamformer configured to dynamically combine beamformed signals (XL; XR) output from the first beamformer and the second beamformer into a combined signal (XC) by weighing; wherein the third beamformer computes a respective noise level of the signals (XL; XR) and weighs the signal with a lowest noise level among the signals (XL; XR) with a highest weight into the combined signal; a noise reduction unit configured to filter the combined signal (XC) from the third beamformer by a time-varying filter.