| 摘要 |
<p>PURPOSE:To prevent the influence of received noise excepting the desired radio waves by making a data significant according to the interrupted state of radio waves intermittent corresponding to the data. CONSTITUTION:A pulse P0 related to a high frequency voltage Vh generated at an antenna 7 is inverted by an inverter 20, and a demodulation circuit 17 demodulates an inverted pulse P1 by generating a pulse P2 related to the pulse P1 synchronously with the rise of the inputted inverted pulse P1. Therefore, even when noise is received, the pulse P1 related to the noise is not generated since the pulse P1 is inverted. Therefore, the pulse P2 is not generated in relation to the noise, and the received data is not made wrong. Namely, the data is made significant according to the interrupted state of radio waves intermittent in relation to the data. Thus, even when noise is received, the data can be correctly received without being affected by it.</p> |
