| 摘要 |
PURPOSE:To select a required channel on each occasion among lots of information channels by allowing the user to be able to set a call number. CONSTITUTION:A call number setting section 4 comprising switches set optionally turned on/off by the user is used. One terminal of each switch in the call number setting section 4 is connected to ground potential and '1', '0' are represented by on/off state. The operation is the same as a conventional operation except the call number setting section 4, and an output obtained from a shift register 31 and a value set by the call number setting section 4 are compared and collated in a call number collation section 3. Thus, the channel required for the user is selected freely among lots of the information channels. |
