| 摘要 |
PURPOSE:To discriminate the optimum direction of installing a satelite broadcast receiving antenna with a sound signal. CONSTITUTION:The detection voltage 3 of a C/N ratio detecting circuit 2 is inputted into a voltage-frequency converting circuit 4 in (A). Thus, dial tones 5 of which kinds are different in accordance with a C/N ratio can be obtained. At the time of installing the antenna, the dial tones 5 are selected by a switching circuit 7 as the input signals of a sound circuit 9. As the result, dialtones of which kinds are different at the respective direction of the antenna are outputted from a speaker 11. Then, a dialtone generating circuit 21 generating a specified dialtone 22 is provided in (B). The dial tone 22 from the dialtone generating circuit 21 is outputted from the speaker 11 to change a sound volume level by the detection voltage 3 of the C/N ratio detecting circuit 2. Namely, the sound volume level of the dialtone 22 varies in accordance with the direction of the antenna.
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