| 摘要 |
PURPOSE:To obtain a guidance system which is easy to construct and maintain by detecting two kinds of markers and sending a signal which is modulated according to the kind by radio, and reproducing guidance information selected among plural pieces of sound-recorded guidance information based on time variation of the modulation as a sound and annunciating the information. CONSTITUTION:A detector (walking stick 5) detects markers B and sends a modulated signal B by radio. When a walker passes a point P, a signal that a guidance device 7 receives changes from the signal B to a signal A. For the purpose, the signal of a receiving antenna 6 is monitored to know the moment when the walker passes the point P and the direction of the passage. A logical processing circuit incorporated in the guide device 7 decides that right after the walker passes the point P, and desired guidance information is selected among pieces of recorded guidance information and sent from a transmitting antenna 8 by radio. This sent signal is received by a receiver and listened to as a sound. Markers are made preferably of bad conductor magnetic materials or metal and discriminated by variation in the inductance of a coil sensor.
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