| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a receiver of a communication system for a vehicle capable of preventing logical values of received data from being misjudged. <P>SOLUTION: In an on-vehicle device 5 of a keyless entry system, an analog reception signal generated by receiving and demodulating a radio signal from an electronic key 3 is input to judgement sections 25 and 27; and the judgement section 25 outputs an Hi judging signal which becomes high when "reception signal>threshold VH", and the judgement section 27 outputs a Lo judging signal which becomes high when "reception signal<threshold VL". Further, a synchronizing signal generator 35 sequentially determines judgement sections from the two signals for judgement. Then a data level judging section 37 judges binary levels of the reception signal by the judging sections based upon the two signals for judgement, and judges that a level is indefinite when the level is determined as neither a high nor a low level, and an indefinite level correction section 39 corrects the indefinite decision result to either of the high and low levels based upon the judgement result of the judging section 37 and rules of an encoding system (for example, a biphase code) used to encode data on the side of the electronic key 3. <P>COPYRIGHT: (C)2008,JPO&INPIT |
