| 摘要 |
PURPOSE:To improve the S/N in the entire equipment by using an oscillated frequency deciding the transmission speed of information through frequency division as a clock for a pseudo noise code generator and a carrier inputted to an information modulation section and using a specific frequency as the carrier and the clock of the pseudo noise code generator. CONSTITUTION:When a signal of 2.456MHz is outputted from a Baud rate oscillator 16, an information modulation section 12 modulates the carrier of 307.2KHz inputted from a frequency divider 18 by using the information sent from an information section 11. When the modulated information is inputted to a balanced modulator 13, the balanced modulator 13 spreads the input signal into a broad band of 153.6KHz-460.8KHz by using a 153.5KHz clock sent from a PN code generator 14. A band limiter 15 sends a spread information signal over a broad band to a lighting line 30 through a lighting line I/F 40. A reception section 20 receives the said spread information signal. The spread information signal is sent to a balanced modulator 22 through a band limiter 21. In this case, noise having a frequency below 120KHz generated from an electromagnetic cooking apparatus or the like is cut off. |
