This paper describes the design of a frequencyshifter to suppress acoustic feedback, to be studied by the experimental method.
本文叙述抑制声反馈的频移器的设计，并进行了实验研究。
2
If the public address system is operated below but too close to the instability condition the frequencyshifter can reduce effectively the interference of the regenerative reverberation.
若语言扩声系统临近不稳定状态工作，频移器可以有效地减少再生混响干扰。
3
Two novel fibre devices, fibre optic frequencyshifter and fibre optic polarization controller, are employed in this system. The principle and design method for the two key devices are described.