| 摘要 |
PURPOSE:To eliminate the trouble of operation by automatically making all of preset channel selections and detecting the tuning of each normal channel selection, and by presetting the them again when some channels have a difference in tuning CONSTITUTION:This device is provided with start stop circuit 9 which outputs a search start signal and search stop signal by being supplied with the channel selection signal of AFT circuit 4 of the TV receiver, the vertical synchronizing signal of synchronizing separator circuit 6, and a search start command tuning voltage generating circuit 10 which is controlled by the start and stop signals of this circuit 9. In addition, this is provided with memory circuit 11 stored with the tuning voltage from this circuit 10 as it desires and signal discrimination circuit 12 supplying the tuning voltage from circuit 11 to tuner 2. Then, tuning-differenc detection circuit 15, provided to this circuit, is operated on the basis of a channel selection command during a channel selection, and when circuit 15 detects a tuning difference, a research start signal is supplied to circuit 9 so as to attain the preset channel selection again. |
