一种实现音频信号变压器传输阻抗自适应的方法

一种能实现音频信号变压器传输阻抗自适应的简易方法,该方法采用电子开关并联多个电阻构成电阻匹配网络,采用电压比较器比较变压器输出负载端信号电压与阻抗端信号电压,比较结果输入控制器,控制器通过比较值控制电子开关,以改变电阻的并联关系,使得电阻匹配网络总的阻抗与外部负载相匹配,即外部负载增加,则增大匹配阻抗;外部负载减小,则降低匹配阻抗,从而自动适应外部负负载的变化。该方法较易实现,实用性强。

A Realization Method of Audio Signal Transmission Impedance Transformer Adaptive

This paper gives a method that can fulfill the auto accommodating of the impedallce in voice frequency transformer. In the method,a number of resistances in parallel to be used to consist of a resistance network,and controlled by the electronic switch. Comparing the input signal＇s Voltage and the output signal＇s voltage via comparators,the MCU control the electronic switch according to the result of the comparators,and the resistance of the resistance network changed coilsequently. So,in the signal traflsmission of voice frequency uses the voice frequency transtbrmer,with the load varied in one side ofthe trailsformer （theside oftheexterllalload）, the resistance of reslstance network can be changed accordingly with the method of this paper,and the resistance ofthe two sides can be matched in time,The method can be achieved easily,and have the practical ettect.