| 摘要 |
PURPOSE:To simplify the operation of an automatic channel selector by automatizing preset channel selection by automatically storing the tuning voltage of each channel selected automatically in an memory in sequence. CONSTITUTION:This device is equipped with search start-stop circuit 9 which outputs a search start signal and search stop signal by being supplied with an AFT detection output voltage from AFT circuit 4 of the TV receiver, the output of synchronizing separator circuit 6, and a search start command, and turning voltage generating circuit 10 which is controlled by the start and stop signals of this circuit 9. In addition, it is equipped with memory circuit 11 stored with the tuning voltage from voltage generating circuit 10 as it desires and signal decision circuit 12 supplying the output of memory 11 to tuner 2. Through the control of sircuit 9, voltage generating circuit 10 is made to generate a gradually-varying tuning voltage at the variation ratio which is decreased when an AFT detection output signal is detected and whose gradient is inverted by the polarity of the AFT signal output signal. |
