| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem, where a received signal is considerably attenuated at the place of a receiving antenna or can be received almost without attenuation at a spot separated for several centimeters on the other hand, since the electric field strength distribution of a radio signal transmitted in the room is made considerably non-uniform by the reflection on the wall or the ceiling. SOLUTION: A signal from the antenna is inputted through a tuner 43 to a demodulator 44 and further sent to a signal processing circuit, while an output signal from the tuner is corrected for errors and converted into a digital value expressing the present amplitude of a tuner signal by an A/D converter 46. This digital value is evaluated by a microprocessor 47. Corresponding to this signal evaluation, the microprocessor 47 issues a control instruction to a driver circuit for suitably driving a motor 41 and moves the position of the antenna.
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