| 摘要 |
The invention relates to a system for speech enhancement in a room (10), comprising: a microphone arrangement (12) comprising at least two spaced apart microphones (12 A, 12B) for capturing audio signals from a speaker's voice, an acoustic beamforming unit (28) for processing the captured audio signals in a manner so as to impart one of a plurality of different directional patterns to the microphone arrangement; a feedback cancellation unit (30) for applying a feedback cancellation algorithm to the processed audio signals and for providing a feedback status signal indicating how close an acoustic feedback loop (12, 17, 20, 22, 24, 28, 30, 40, 46) of the system is to feedback; means (20, 22) for amplifying the processed audio signals; a loudspeaker arrangement (24) to be located in the room for generating sound according to the amplified audio signals; and means (36) for selecting the directional pattern imparted to the microphone arrangement as a function of the feedback status signal. |
