| 摘要 |
PURPOSE:To improve the reliability of information signal transmission, by forecasting a period where no noise exists through the use of periodicity of the noise and transmitting signals during the period, in a signal transmission line where noise of large amplitude is generated. CONSTITUTION:A noise component (a) on a power line is detected with a resonance circuit 3, supplied to a signal processing circuit 5, and the noise component at a prescribed level or over is detected to generate a pulse signal (b) which represents a period where a large amplitude noise does not exist. This signal (b) is applied to a one-shot multivibrator 6 and an AND circuit 7, and a signal (d) having the pulse width of the signal (b) when the pulse width of the signal (b) is smaller than a prescribed width and having the pulse width of a pulse signal (c) when larger than the prescribed value, is generated. This signal (d) is applied to a one-shot multivibrator 8 to generate a pulse signal (e), and the signals (e) and (b) are ANDed 9 to generate a pulse signal (f). Further, the period of a pulse with a constant width representing the tail edge by the signal (f) from the signal (d) is taken as the transmission period of information signal. |
