Patent ID: 6061456
Filing Date: 2000-05-09
Classification: G10K,H04B,H04M,H04R

Abstract:
A transducer for use in a noise cancellation apparatus for reducing background noise comprising:a housing having first microphone means for receiving a first acoustic sound composed of speech originating from an operator operating said apparatus and background noise, and for converting said first acoustic sound to a first signal, and second microphone means arranged at a predetermined angle .O slashed. in close proximity with respect to said first microphone means for receiving a second acoustic sound composed of substantially said background noise and for converting said second acoustic sound to a second signal;said first and second microphones are connected to a differential amplifier means of the noise cancellation apparatus so as to obtain a signal representing substantially speech;the amplifier means for receiving acoustic sounds from each microphone and having a first terminal and a second terminal, wherein the second terminal is grounded;a transistor means for receiving and amplifying an AC signal representative of the audio input from each microphone; andmeans for filtering the amplified AC signal from the DC signal, so that the DC signal powers the amplifier means.