Method for the interference suppression in ultrasonic distance m

Details Method for the interference suppression in ultrasonic distance m Method for the interference suppression in ultrasonic distance m

1989-06-13

1991-07-30

Teska, Kevin J.

Boots, shoes, and leggings

73602, 36457101, 364575, G06F 1520, G06G 712

Patent

active

050364774

ABSTRACT:
In measuring distance with an ultrasonic proximity initiator stochastic interference signals can cause false pulses which have been suppressed largely by pulse width evaluation. While limiting false releases based on false pulses, the evaluation of the echo signal has been coarse because the amplitude of the pulses is not evaluated. This shortcoming is eliminated by sampling the analog echo signal at the ultrasonic proximity initiator at given time intervals and then subsequently converting the sampled values into digital values. This step is followed by a program controlled mathematical combining of the new digital values with digital values stored in a data memory that were derived from corresponding times in previous echo signals. The new digital values produced by the mathematical combination are stored in a data memory and evaluated with respect to amplitude or pulse width to determine distance. The distance thus obtained is displayed for each pulse cycle. The method can be used in ultrasonic proximity initiators for measuring distance.

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