【発明の詳細な説明】Detailed Description of the Invention Thus, the signal is turned to a reflected wave signal of an audible frequency band width by frequency conversion to be outputted to the earphones 4R and 4L and an audible reflection sound indicating the reception of the reflected wave (b) to recognize the distance of the obstacle based on a time difference. When the reflected wave (b) is received within a specified receiving period t2 from the emission, a reflected wave signal is converted into digital from analog at a fixed conversion cycle and a digital data are stored into a memory and after a period t2, it is read out to be converted into analog from digital at a cycle N times as much as the AD conversion cycle and a time base is extended by N times to turn the signal to a low frequency down to I/N. To meet the need for recognizing the emission of a sound wave (a), a listening start sound signal is outputted to earphones 4R and 4L simultaneously with the emission of the sound wave (a) from a device 1 and a blind person recognizes the emission of the sound wave (a). CONSTITUTION:An ultrasonic wave (a) emitted from a transmission sensor 2 is reflected on an obstacle (m) and the reflected wave (b) is received with receiving sensors 3R and 3L to be outputted to ultrasonic listening devices 5R and 5L. PURPOSE:To obtain a highly reliable blind guidance apparatus by including an ultrasonic transmitter, transmitting/receiving sensors, an ultrasonic listening device and the like. 241000282472 Canis lupus familiaris Species 0.000 description 9.230000001702 transmitter Effects 0.000 abstract description 2.238000001514 detection method Methods 0.000 claims description 17.230000005236 sound signal Effects 0.000 claims abstract description 12.238000006243 chemical reaction Methods 0.000 claims abstract description 20.230000005540 biological transmission Effects 0.000 claims abstract description 29.Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Application filed by OSAKA KIDEN KK filed Critical OSAKA KIDEN KK Priority to JP6020754A priority Critical patent/JPH07229962A/en Publication of JPH07229962A publication Critical patent/JPH07229962A/en Status Pending legal-status Critical Current Links Original Assignee OSAKA KIDEN KK Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Inventor Shuji Mifune 修二三船 Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Pending Application number JP6020754A Other languages Japanese ( ja) Google Patents Ultrasonic blind guidance apparatus Google Patents JPH07229962A - Ultrasonic blind guidance apparatus

JPH07229962A - Ultrasonic blind guidance apparatus

Ultrasonic listening device