电视机中的对称式比例鉴频器

The Discriminative Frequency Apparatus of Symmetric Scale in TV

介绍了电视机中对称式比例鉴频器的作用 ,电路的构成 .论述了将调频波 ( 6.5MHz的第二伴音中频信号 )变为调幅调频波和对调幅调频波进行检波得到原调制信号 (伴音信号 )的工作原理 .

This paper instends to introduce the effect of the discriminative frequency apparatus of symmetric scale in TV,the formation of circuit and to discuss how to change the frequency modulation wave of equal amplitude(the second accompanied sound middle-frequency signal of 6.5 MHz)into the frequency modulation wave of regulated amplitude, to detect the frequency modulation wave of regulated amplitude and to obtain the original regulated signal(audio frequency signal).