Ultrasonic distance measuring apparatus

Details Ultrasonic distance measuring apparatus Ultrasonic distance measuring apparatus

1983-04-25

1986-03-25

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367138, G01S 766

Patent

active

045787832

ABSTRACT:
Undesirable or unpleasant audible sound otherwise generated in a conventional distance measuring apparatus is removed or minimized by controlling the waveform of a burst signal supplied to an ultrasonic transducer so that it has a substantially trapezoidal waveform changing in level with time at rise and/or fall portions thereof.

REFERENCES:
patent: 3992692 (1976-11-01), Filer
patent: 4271705 (1981-06-01), Crostack

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