扩声系统移频增音的PSpice仿真分析  

PSpice Simulation Analysis of Frequency Shifting in Sound Reinforcement System

作　　者：郝为强[1] 

机构地区：[1]东软飞利浦医疗设备系统有限责任公司,辽宁沈阳110179

出　　处：《电声技术》2006年第12期13-16,共4页Audio Engineering

摘　　要：扩声系统中普遍存在由声反馈导致的啸叫问题。如何合理有效地抑制声反馈,提高扩声系统增益是衡量扩声系统性能的重要依据。实践证明,移频器能显著提高扩声系统增益。虽然移频电路只能应用于语言类扩声系统中,但因其电路实现相对简单、抑制啸叫效果较明显等特点,得到了广泛应用。依据Weaver法移频原理,利用PSpice仿真软件对移频增音电路进行了仿真分析,为广大音响设计工程师提供了有价值的参考。The acoustic feedback even howling is a well-known problem in sound reinforcement system. How to reduce acoustic feedback and enhance the maximum usable gain of sound reinforcement system is one of the most important terms to evaluate the performance of the sound reinforcement system. In fact, the frequency shifter can greatly enhance the usable gain of the sound reinforcement system. Although it can only be used in speech reinforcement system, but due to its simplicity and validity, it is widely used. Based on Weaver method of frequency shifting, the circuit structure of frequency shifter by using PSpice simulation software is analyzed and the useful information and valuable reference for sound engineers are provided.

关 键 词：声反馈 啸叫 移频器 Weaver法 正交振荡器 低通滤波器 模拟乘法器 

分 类 号：TB54[理学—物理]