| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that a conventional receiver is expensive due to the fact that the conventional receiver needs to integrated a reference frequency source such as a crystal oscillator to convert the received modulating radio frequency signal into a medium frequency signal, and also to solve the problems that the oscillators generate frequency fluctuation, are scattered and destroyed under bad environments, with respect to temperature, humidity, vibration, acceleration, shock, etc., and that the quality of the received data is easily deteriorated and the function of the receiver itself is degraded. SOLUTION: In the radio receiver, a modulated radio frequency signal and an unmodulated carrier defined as the modulated frequency intermediate frequency are simultaneously transmitted from a radio transmission device so as to generate an intermediate frequency signal at the inner part of the receiver which receives both of the modulated signal and the unmodulated carrier. Therefore, a fundamental frequency signal source as a local oscillator is in no need of the receiver, so the cost of the receiver itself is reduced and environmental condition against temperature, humidity, vibration, acceleration and shock, etc., are extensively relieved.
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