Howling preventing method for loudspeaking simultaneous call interphone and said interphone
专利汇可以提供Howling preventing method for loudspeaking simultaneous call interphone and said interphone专利检索，专利查询，专利分析的服务。并且PURPOSE:To ensure a highly effective prevention for the howling with the loudspeaking simultaneous interphone by installing the sound reception face of the sound wave entering the microphone at the back of the radiation face of the sound wave arriving from the speaker. CONSTITUTION:Sound reception face 20 of the sound wave entering mike 12 is put at the back to radiation face 16 of the sound wave snet from speaker 14. Mike 12 is connected to adder circuit SIGMA via phase shift circuit tau of pi-radian, and mike 12' is connected directly to circuit SIGMA. But these two mikes have the different distances from speaker C and different phases, thus obtaining output S. And this output rings the speakers of the interphones of the same structure, and this ringing is added to the two mikes in the equal distance and the opposite phases to produce no output. As a result, no howling is caused through the interphone of the self-side. Circuits tau and SIGMA can be realized by the distribution and connection of the two mikes. As a result, the acoustic coupling can be blocked at the high range via the directivity and the diffraction effect of the sound wave, and also the acoustic coupling can be prevented at the low and intermediate ranges by the opposite phase addition of plural mikes. Thus the howling can be avoided.，下面是Howling preventing method for loudspeaking simultaneous call interphone and said interphone专利的具体信息内容。
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