十、黑白电视机的伴音通道前面已经讲过,电视机的伴音信号与图像信号一起由天线接收后送入高频头电路和图像中放电路。在视频检波过程,由于二极管的非线性作用,伴音中频信号与图像中频信号混频后产生出一个新的中频信号,就是我们所说的第二伴音中频信号,其频率为6.5MHz。 Ten, black and white TV audio channel As already mentioned before, the TV’s audio signals and image signals together by the antenna into the tuner circuit and the image discharge circuit. In the video detection process, due to the diode nonlinear effect, the audio intermediate frequency signal mixed with the image IF signal to produce a new IF signal, which is what we call the second audio intermediate frequency signal, the frequency of 6.5MHz.