| 摘要 |
<p>PURPOSE:To eliminate the need for a troublesome operation by selecting a reception signal of an M/N converter when a keyed AFC pulse signal is detected and selecting a reception signal of a BS channel having received just before when the keyed AFC pulse signal is lost. CONSTITUTION:A keyed AFC pulse signal of nearly 0.5V inputted from an M/N converter 4 to a keyed AFC pulse input terminal 8 of a BS receiver section 7 is amplified into a signal of nearly 5V by an amplifier circuit 25 and inputted to an MCPU 14. The MCPU 14 discriminates the presence of the input of the keyed AFC pulse signal and selects a reception signal changeover switch 15 to the video input mode when the presence of input is discriminated and a character signal representing 'HIVISION' and 'BS reception channel' is outputted as a video signal inputted to a VCJ circuit 18. Thus, the HIVISION broadcast is displayed on the screen of a CRT 20 of a BS built-in CTV 11 and characters displaying the 'HIVISION' and 'BS reception channel' are displayed thereon.</p> |
