基于RC双T选频网络的立体声仿真器

Stereo Emulator Based on RC Dual T Frequency Selective Network

当前利用软件或硬件手段将单声道信号转换为立体声信号,只是简单把单声道(左声道)音频复制到右声道,这样得到的“假立体声”,听上去声音完全一模一样、非常单调、缺少空间感。设计一种电路,利用两个平行的RC(阻容)双T选频网络,与运放电路C构成一个有源带阻滤波器电路,将单声道全信号中6kHz^250Hz的信号衰减掉,剩下的作为左声道信号;此左声道信号同时作为另一个差动运放B的正相输入,单声道全信号作为该差动放大器B的另一个输入(反相端),故右声道信号就是该运放B两个输入的差模信号。这样就从普通的单声道信号中得到了两个相异的信号,可以产生更舒适的立体声效果。

At present,the mono-channel signal is converted into stereo signal by means of software or hardware that is just simply copying mono(left channel)audio to the right channel so that the"false stereo"can be obtained,which sounds exactly the same,very monotonous and lacks the sense of space.An active band-stop filter circuit is designed by using two parallel RC(resistance-capacitance)dual-T frequency selective networks and operational amplifier circuit C,which attenuates the signal of 6 kHz-250 Hz in the mono-channel full signal,and the remaining signal is used as the left channel signal.This left channel signal is also used as the positive phase input of another differential operational amplifier B,mono-tone.The full channel signal is another input(reverse phase)of the differential amplifier B,so the right channel signal is the differential mode signal of the operational amplifier B.In this way,two different signals are obtained from the ordinary mono-channel signals,which can produce a more comfortable stereo effect.