| 摘要 |
PURPOSE:To prevent excessive expansion of a transmitting band, by changing a frequency dividing ratio in correspondence with the change in data, providing a carrier frequency in an adequate range, thereby optimizing the amount of frequency shift accompanied by the minute deviation in temperature and pressure. CONSTITUTION:Data such as pressure is detected by a responsive oscillator 1. A carrier wave through an original oscillator 3 and a multiplier frequency divider 4 is modulated by a modulator 2 in response to the detected pressure and the like and transmitted. The frequency dividing ratio of the frequency divider 4 is controlled by a frequency detector 5, which detects the frequency of the oscillator 1 and an controller 6. The amount of shift of the carrier frequency is optimized in accordance with the minute deviation in pressure and the like. As a result, the excessive expansion of the transmitting band is prevented, and the intrusion of noises and the like can be prevented. |
