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本文叙述抑制声反馈的频移器的设计,并进行了实验研究.当语言扩声系统的传声器和扬声器之间插入频移器时,传声器信号的所有频率分量都偏移一个常量,这种方法可以减少语言扩声系统在有声反馈时产生的两类畸变.对于一般厅堂,扩声声级大约可提高5—8分贝.对于具有分布式扬声器的窒外扩声系统,也有类似的效应.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.
This paper describes the design of a frequency shifter that suppresses acoustic feedback and conducts experimental studies.When a frequency shifter is inserted between a microphone and speaker of a speech sound reinforcement system, all frequency components of the microphone signal are shifted by a constant amount. This method Can reduce the two types of distortion that occur when a sound reinforcement system is acoustically fed back, and for a general hall, the sound level of the sound reinforcement can be increased by about 5 to 8 dB. A similar effect is also obtained for a sound reinforcement system with distributed speakers. Adjacent to the language sound reinforcement system unstable state, frequency shifter can effectively reduce the reverberation interference.