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本文用网络矩阵方法对具有二个进声口的传声器进行了理论分析,得到传声器灵敏度的一般公式以及传声器具有心形指向性的条件。用这一结果对双振膜双极板电容传声器极头进行了推导,求得传声器极头的开路灵敏度和心形指向性条件与各声学元件参数的关系。讨论了提高心形指向性传声器极头开路灵敏度的办法。实验表明,推导结果与实测结果基本相符。
In this paper, we use the network matrix method to analyze the microphone with two sound ports, and get the general formula of microphone sensitivity and the condition that the microphone has cardioid directivity. Using this result, the pole of the double diaphragm condenser microphone was deduced, and the relationship between the sensitivity of open microphone and the condition of the cardioid and the parameters of each acoustic element were obtained. Discusses ways to improve the sensitivity of the heart-shaped directional microphone’s open-ended pole. Experiments show that the deduced results are basically consistent with the measured results.