| 摘要 |
<p>PROBLEM TO BE SOLVED: To normally send data by preventing the collision of transmission signals. SOLUTION: A synchronizing signal generation part 30 generates a power source synchronizing signal from a commercial power source waveform. A communication control part 40 generates a previously set sending timing for data '0' and '1' from the power source synchronizing signal. At the time of data transmission, the part 40 sends a sending timing corresponding to transmission data to a modulation and demodulation part 20, which outputs a PN code with the sending timing to an interface part 10. The part 10 adds the PN(pseudo noise) code to an electric lamp line 100. At the time of receiving data, the part 10 fetches information from the line 100. The part 20 obtains the correlation between fetched information and the PN code. The communication control part investigates a sending timing corresponding to the correlation result to discriminate the kind of data.</p> |
