1995 Volume 8 Issue 4 Pages 176-182
This paper describes a practical method of a new type of an acoustic receiver using the co-sensor with no vibration sensor in order to decrease the influence of the equi-status noise (NMN : normal mode noise). The co-sensor is physically arranged close to the acoustic sensor as a counter measure for the noise circumstances. The acoustic signal is only received by the acoustic sensor and NMN is separately detected by both the acoustic sensor and the co-sensor. Then the recieved noise can be eliminated or canceled without the phase processing. From the experimental results using this method, SNR (signal noise ratio) increases around 35dB in the air 13dB under the water respectively.