| 摘要 |
PURPOSE:To eliminate the generation of picture stripe pattern due to beat disturbance by providing a frequency variable means to change the oscillating frequency at beat disturbance generation to an oscillating circuit so as to change the frequency of the oscillating circuit when the beat disturbance occurs. CONSTITUTION:A video transmitter 2 of a television interphone consists of the oscillating circuit 6 and a modulating circuit 7. The oscillating circuit 6 is provided with a frequency varying means to vary the oscillated frequency, and an oscillating frequency control terminal 8 to control the frequency is led out of the frequency vary means so as to vary the frequency by an external control signal. |
