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本文详细地讨论了利用声干涉管获得超指向传声器的工作原理,对声干涉管开孔的分布规律进行了理论上的推导,得到孔径和干涉管长度之间的关系y为了在低频时传声器有强的指向性,传声器极头必须设计成压强——压差复合结构。使传声器大约在150Hz得到心形指向性而在420Hz以上利用干涉原理得到棒状形指向性。本文还对超指向电容传声器的具体设计进行了细致的讨论。
This paper discusses in detail the working principle of using an acousto-optic interferometer to obtain an ultra-directional microphone, and theoretically derives the distribution of the aperture of the acoustical interferometer to obtain the relationship between the aperture and the length of the interfering tube. Strong directivity, the microphone must be designed into a polar pressure - pressure composite structure. The microphone is made to have a cardioid at about 150 Hz and the rod-shaped directivity is obtained at 420 Hz or above using the principle of interference. This article also discussed the specific design of super-directional condenser microphone.