Coordinate input apparatus, vibration sensing device and method

Details Coordinate input apparatus, vibration sensing device and method Coordinate input apparatus, vibration sensing device and method

1993-08-26

1996-10-29

Trammell, James P.

Boots, shoes, and leggings

178 18, G01B 1700, G06K 1114

Patent

active

055702996

ABSTRACT:
Vibration applied to a tablet is sensed by a sensor provided on the tablet and a time delay from generation of the vibration to the sensing thereof is measured, whereby distance from the vibration source to the sensor can be measured. If the vicinity of the leading edge of the envelope of registration is sensed when sensing the vibration, the effects of reflected waves from the periphery of the tablet are reduced. To this end, the envelope is differentiated to detect an inflection point. The peak gain frequency of the differentiating circuit is greater than the frequency of vibration generated by the vibration source. As a result, the phase of the output signal produced by the differentiating circuit is advanced by about .pi./2 with respect to the phase of the input signal, thereby making it possible to sense vibration more quickly.

REFERENCES:
patent: 4665282 (1987-05-01), Sato et al.
patent: 4931965 (1990-06-01), Kaneko et al.

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