| 摘要 |
The CATV terminal device has a first and a second memory, a decision circuit, and a channel number modifying circuit. The CATV terminal device periodically receives channel data, which is stored in the second memory. The channel data contains channel numbers representing channels on which TV programs can be received. When a person selects a desired channel as by operating a key input section, a control circuit checks if the selected channel number, which is stored in the first memory, is the one contained in the channel data. If not, the control circuit increments or decrements the selected channel number by the channel number modifying circuit until it finds a channel number contained in the channel data which is available for TV program reception. The channel number thus chosen will be set as a channel number to be turned when the present time on the timer comes. This prevents channel numbers not available for reception from being selected inadvertently during the timer setting procedure.
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