| 摘要 |
<p>An electronic endoscope 10 is provided with an FM circuit 41 and an SSB modulation circuit 42. Electric power is supplied to the electronic endoscope 10 from a battery 32. The battery 32 is connected to a voltage detection circuit 35. The voltage detector 35 detects a voltage of the battery 32 and inputs the detected voltage to a CPU 30. The CPU 30 determines as to whether or not the voltage of the battery 32 is equal to or lower than a predetermined value. If the CPU 30 determines that the voltage is equal to or lower than the predetermined value, the CPU 30 causes the SSB modulation circuit 42, which consumes less power, to modulate image data.</p> |
