| 摘要 |
PURPOSE:To quicken a response time and to enable the miniaturizing of the capacity of a memory by prescribing the searching point with an ultrasonic pulse and by memorizing with corresponding in advance the displaying place of the inside of the display device with the searching point thereof. CONSTITUTION:Ultrasonic pulse is transmitted for the prescribed searchig point from a wave transmission sensor 21 and the reflected wave from the obstacle of the ultrasonic pulse transmitted is detected by a wave receiving sensor 22. A quantization circuit 26 outputs a binary signal with sampling the signal outputted from the wave receiving sensor 22 each the prescribed time. Now, a microcomputor 5 makes a coding signal with multi-bits by dividing the binary signal outputted from the circuit 26 into each the prescribed number, and the display point corresponding to each searching point of the display device is designated with discriminating in order the existance of an obstacle at each searching point by decoding the coded signal thereof being sent in order to a shift register 57 which is for serial communication. |
