摘要
音质问题是现有声频定向系统普遍存在的问题,国内外声频定向系统常使用压电式换能器作为输出。针对该材料的换能器建立其相关电路等效模型,选择高效的功率驱动方式,设计优化了后级匹配电路。从理论和实践两方面分析了匹配网络带来的总谐波失真(THD),确定了匹配网络品质因数Q值对THD的影响,为减小系统总谐波失真,改善音质提供了依据。
The problem which exists in most audio directional system is that the sound quality can not meet the application requirement.Piezoelectric transducers are often used in the system to generate audible sound with high directivity.The equivalent circuit model of the transducer is built and an efficient power amplifier is designed.Besides,the impedance matching network is also designed and optimized.The total harmonic distortion（THD） arose from the matching network has been analyzed from both the theory and practice.The effect of Q value of the matching network on THD has been determined.The proposed method can be used to reduce THD and improve the audio performance in the audio directional system.
出处
《压电与声光》
CSCD
北大核心
2012年第5期797-800,共4页
Piezoelectrics & Acoustooptics
基金
参量声源的非线性信号处理方法研究基金资助项目(60901062)
