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Based on the speciality of transistor s non-linearity,using maths method,this article analyses the cause of whistle of frequency conversion circuit and provides method to eliminate.

　本文根据晶体管非线性元件的特点,利用数学推导方法,从基础上分析了变频工作啸叫的原因,并提出了消除方法。

It has solved the problems of howling in the sound field and the combing frequency response distortion caused by multi-point pickup.

分析了移频扩声系统的组成及主要特点,针对多媒体教室的扩声系统容易产生回声和啸叫等不足,提出了一种多媒体教室移频扩声系统的设计方案。

The acoustic feedback even howling is a well-known problem in sound reinforcement system.

扩声系统中普遍存在由声反馈导致的啸叫问题。

Aim at the problems of reverberation、 echo and howling etc of public-address system, the paper research these common solutions :parameters equalizer、 feedback canceller and frequency shifter at current public-address processors, and analyze the design of the most advanced products at home and abroad, finally put forward new application-oriented solutions.

针对扩声系统中出现的混音、回音和啸叫等问题，本文对比了当前扩声处理器常用的解决方案：参量均衡器、反馈抵消器和移频移相器，并对当前国内外最先进产品的设计思路进行了探索，然后提出了面向应用的解决方案。