声频定向系统电声效率的提升方法和实验研究

压电陶瓷换能器是声频定向传输系统中的发声部件，以往的此类试验系统中，换能器和前级功放电路之间的阻抗匹配问题考虑较少，而阻抗失配会影响整个系统的工作效率，甚至造成功放和换能器的损毁。该文根据压电陶瓷换能器的电学特性，对声频定向传输系统中阻抗匹配对其电声效率的影响进行了研究，提出了该类系统的阻抗匹配理论方法，并通过实验对功放匹配电路的性能进行了测试。结果表明，利用该文所提方法可使距离系统3 m处的最大声压由58 dB增大到73 dB。

Improvement Methods and Experimental Studies on Electro Acoustic Efficiency of Audio Directional System

Piezoelectric ceramic transducer is the vocalization component of the audio directional system. In the past experiments, people did not taking into account the impedance matching between the transducer and power amplifier. The impedance mismatch could reduce the working efficiency, and damage transducer and power amplifier. Based on the electrical properties of piezoelectric ceramic transducers, the influence of the impedance matching circuit on the electro acoustic efficiency was studied, and the impedance matching methods to these problems were given. In the end, the performance of the impedance matching circuit was tested through experiments. The result of the experiment showed that the maximum sound pressure with 3 m away from the transducer enhanced from 58 dB to 73 dB.