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本文主要介绍目前电视机生产中伴音电路调试的几种方法,以及在生产中出现的问题并加以比较。我们知道电视机中的伴音是采用调频方式传输的,经过检波器混频后输出的第二伴音中频为6.5MHz的调频信号。鉴频器的作用是从第二伴音中频中取出音频信号。目前,用于伴音鉴频调试的方法主要有四种:“S曲线”调试法,“调幅波”调试法,“电压”调试法和“方波”调试法。为了便于以后讨论,先定性分析一下伴音“S曲线”产生的机理。在集成电视机伴音电路中普遍采用差分峰
This article mainly introduces several methods of debugging the audio circuit in TV production at present, as well as the problems in the production and comparison. We know that the TV’s sound is transmitted using the FM method, after mixing the detector output of the second audio intermediate frequency 6.5MHz FM signal. The role of the frequency discriminator is to remove the audio signal from the second audio intermediate frequency. At present, there are mainly four methods for sound frequency frequency debugging: “S curve” debugging method, “amplitude modulation wave” debugging method, “voltage” debugging method and “square wave” debugging method. In order to facilitate the discussion later, first qualitative analysis of the sound “S curve ” mechanism. Difference peaks are commonly used in integrated TV sound circuits