Why audio buffer needs only one stage while video buffer needs two stages for amplification?

为何音频电路仅需要单级放大电路，而影像电路必须两级反向。

youdao

Why audio buffer needs only one stage while video buffer needs two stages for amplification?

为何音频电路仅需要单级放大电路，而影像电路必须两级反向。

youdao