公开(公告)号：US3688199A

公开(公告)日：1972-08-29

申请号：US3688199D

申请日：1970-05-13

申请人： YOSHIFUMI SAEKI ,  SEIICHIRO KURIHARA

发明人： SAEKI YOSHIFUMI ,  KURIHARA SEIICHIRO

IPC分类号： H03J7/30 ,  H04B1/32

CPC分类号： H03J7/30

摘要： A device for automatically tuning a channel on a broadcast receiver which has a right or left direction indicating circuit operated by closing a start push-button switch, the indicating circuit operating a differential amplifier circuit which in turn operates an electric motor which turns a variable condenser. The device further comprises a coarse tuning pulse signal generating circuit to generate a pulse signal when the condenser is near the tuning point, and a coarse tuning bistable multivibrator which is switched by a pulse signal from the coarse tuning pulse signal generating circuit to shut off the power to the right or left direction indicating circuit. When the indicating circuit is switched, a sinusoidal signal from a discriminator is applied to an input of the differential amplifying circuit. The device also has a switching circuit for de-energizing the differential amplifying circuit after the fine tuning is completed by the sinusoidal signal and for delaying for a predetermined time a further output of the coarse tuning bistable multivibrator to enable manual tuning.

摘要翻译： 一种用于自动调谐广播接收机上的频道的装置，其具有通过关闭开始按钮开关而操作的右或左方向指示电路，所述指示电路操作差分放大器电路，所述差分放大器电路又操作电动机，所述电动机使可变电容器 。 该装置还包括粗调谐脉冲信号发生电路，用于当电容器靠近调谐点时产生脉冲信号;以及粗调双稳态多谐振荡器，其由来自粗调脉冲信号发生电路的脉冲信号切换，以切断 电源向右或向左指示电路。 当指示电路被切换时，来自鉴频器的正弦信号被施加到差分放大电路的输入。 该器件还具有用于在通过正弦信号完成微调之后使差分放大电路断电并且用于延迟预定时间的开关电路，进一步输出粗调双稳态多谐振荡器以实现手动调谐。