| 摘要 |
The present invention is embodied in a method and apparatus for eliminating audio feedback which includes an active microphone coupled to an amplifier which transmits signals received at the active microphone to a parametric speaker to generate a feedback controlled signal for broadcasting. The apparatus may also be adapted for use with an audio system wherein the invention comprises (i) at least one transducer for detecting at least one sonic frequency and generating an electrical signal representative of the at least one sonic frequency, (ii) a processor for receiving the electrical signal and generating a first ultrasonic frequency which has been modulated with the at least one sonic frequency, (iii) a parametric demodulator for recovering the at least one sonic frequency from the first ultrasonic frequency, and (iv) a speaker for directly emitting the recovered sonic frequency as a feedback controlled audio emission.
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