电视接收机图象中频放大器中用的声表面波滤波器,在设计制作和使用上容易产生寄生信号的干扰,影响到接收图象质量。本文着重分析寄生信号中的直通信号及三次回波信号的产生原因,并从使用的角度提出抑制这些干扰的方法。还指出为了抑制三次回波可在一定程度上失配使用声表面波滤波器。 TV receiver IF amplifier used in SAW filters, the design and manufacture and use of parasitic signals prone to interference, affecting the received image quality. This article focuses on analysis of the parasitic signal in the pass-through signal and the three echo signal causes, and from the point of view of the proposed suppression of these interference methods. It has also been pointed out that surface acoustic wave filters can be used to suppress the triple echo to a certain degree.