论文部分内容阅读
电视接收机存在各种干扰,可分为外界干扰和接收机内部干扰两大类。外界干扰系指天电干扰(例如雷电)、通讯设备(雷达、各种电台)、工业上的电气设备(高频电炉、汽车、日光灯、开关设备和高压设备)等所产生的高频、高压脉冲等干扰。接收机内部干扰系指行场的串扰和其辐射干扰、电源干扰、图像和伴音的相互干扰以及通道寄生振荡所造成的画面拉丝等干扰。本文重点讨论接收机频道间的相互干扰,特别是由于电视机通道的放大系统的非线性,所形成的交扰调制、相互调制、中频差拍、高次中频差拍等各种组合频率的干扰。
There are all kinds of TV receiver interference, can be divided into external interference and receiver internal interference two broad categories. External interference refers to the high frequency, high voltage (high frequency, high voltage, high voltage, high voltage, high voltage, high voltage, etc.) generated by the interference of electrotechnical equipments such as lightning, communication equipments such as radar and all kinds of radio, industrial electric equipment, Pulse and other interference. Receiver internal interference refers to the field of crosstalk and its radiation interference, power interference, the image and the sound of mutual interference and channel parasitic oscillations caused by the screen drawing and other interference. This article focuses on the mutual interference between receiver channels, especially due to the non-linearity of the amplification system of the television channels, interference caused by various combinations of crosstalk modulation, intermodulation, IF beat, high-order IF beat, etc. .