| 摘要 |
PURPOSE:To make circuit integration easy, thrugh contactless configuration, in a channel selector of a television receiver, etc. CONSTITUTION:A voltage obtained at a valume 10 is given to a comparison circuit 11 at writing, a digital output of 12 bits from a memory block 16 is compared with a voltage D/A-converted at a D/A converter 17, and only when both are not coincident, a gated oscillator 12 is oscillated to drive a counter 13, the output of the counter 13 is inputted to a memory block 16, an output of the block 16 is outputted to the D/A converter 17 and applied to the comparator 11. In adjusting the volume 10 and changing over a switch 15 to the channel selection, by confirming a received screen, a voltage of this state is stored in a digitally stored in the memory block 16 (the address is designated with a keyboard 1). At readout, the storage information of the address designated at the keyboard 1 is outputted from the memory block 16 and this information is given to a variable reactance element of a tuner 18 via the D/A converter 17. |
