Patent ID: 6041126
Filing Date: 2000-03-21
Classification: H04M,H04R

Abstract:
A noise cancellation system having a mouth position and an ear position, and comprising:noise detecting means for detecting noise,a talking microphone installed near the mouth position,a speaker installed near the ear position,first filter means connected to the noise detecting means,first adding/subtracting means for adding or subtracting by using an output of the talking microphone and an output of the first filter means, and sending the result to a talking signal output terminal,error detecting means installed near the ear position for detecting an output of the speaker and the noise,second filter means connected to the noise detecting means, andsecond adding/subtracting means for adding or subtracting by using an output of the second filter means and a receiving signal, and sending the result to the speaker,wherein the first filter means receives the detected noise, and a coefficient of the first filter means is updated by using the added or subtracted result outputted from the first adding/subtracting means,the second filter means receives the detected noise, and a coefficient of the second filter means is updated by using an output of the error detecting means, andthe signal to be sent to the talking signal output terminal is also substantially sent to the speaker.