| 摘要 |
PURPOSE:To dislay a direction to be moved toward an usable zone even if a mobile equipment exists at the outside of zone by providing an electric field azimuth notifying means notifying the azimuth of electric field based on a signal from a level detection section. CONSTITUTION:A level storage section 2, a level comparison section 3 and an electric field azimuth display section 4 constitute an electric field azimuth notifying means. A level detection section 1 receives an electric field detection signal (a) from a reception section 5 to detect a mean value in a time (optionally set time) and outputs a mean value signal (b) representing the value to the level storage section 2 and the level comparison section 3. The level storage section 2 stores the mean value signal (b) from the level detection section 1 and retards it by a time and gives the result to the level comparison section 3 as a delay signal (c). The level comparison section 3 receives the mean value signal (b) from the level detection section 1 and the delay signal (c) from the level storage section 2, compares the level difference and outputs a signal (d) in response to a higher level input to the electric field azimuth display section 4, which uses the signal (d) from the level comparison section 3 to display 'front' or 'rear direction'. |
