Acoustic Zooming Technique Based on Differential Microphone Arrays
This paper is devoted to study an acoustic zooming technique,which is to acquire high fidelity acoustic signals originated from a target region while rejecting those signals outside this region.The technology is widely used in smart phones,mobile devices,teleconference,public address systems and so on.The mathematical model for acoustic zooming is firstly established,the differential beam forming based zooming method for acoustic zooming is investigated.Secondly,simulations concerning the attenuation curve and frequency response curve of the array end radiation direction are performed to analyze the effect of interference on stealth.Finally,a zooming microphone array system is developed and the zooming performance is evaluated in the anechoic chamber.The evaluation results show that it is feasible to implement stealth based on differential microphone array.
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