| 摘要 |
PURPOSE: A wireless signal transmitting and receiving instrument used for automatically collecting the toll fee is provided, thereby the identification of cars and collection of the toll fee can be rapidly performed. CONSTITUTION: The wireless signal transmitting and receiving instrument consists of a high frequency signal receiving and processing part which receives wireless signal from antenna, removes image noise, and converts high frequency signal into middle frequency signal; a middle frequency signal processing part which processes middle frequency signal received from the high frequency signal receiving and processing part, and extracts and outputs signal; and a high frequency signal transmitting and processing part which transmits signals having car-receivable high frequency range. |
