| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a communication circuit, which is less susceptible to noise and can communicate in a short time by clearly recognizing transmission start of information, and a communication device for a vehicle using the same. <P>SOLUTION: A transmission unit 1 of a communication circuit comprises: a bit string generation circuit 31 for transmitting a start bit sb and an information bit string ib in series; a first modulation circuit 41 for generating a first high-frequency signal r1 by modulating a first carrier wave with the start bit; a second modulation circuit 43 for generating a second high-frequency signal r2 by modulating a second carrier wave with the information bit string; and a transmission circuit 51 for transmitting the first high-frequency signal and the second high-frequency signal. A reception unit 2 comprises: a reception circuit 61 for receiving a transmitted signal; a first detection circuit 71 for demodulating the start bit by detecting a signal of the first carrier wave; a second detection circuit 72 for demodulating the information bit string by detecting a signal of the second carrier wave; and a detection circuit 81 for reading out the information bit string by being synchronized with the start bit. <P>COPYRIGHT: (C)2012,JPO&INPIT |
