Acoustic condition sensor employing a plurality of mutually non-

Details Acoustic condition sensor employing a plurality of mutually non- Acoustic condition sensor employing a plurality of mutually non-

1998-12-23

1999-11-16

Shankar, Vijay

Telegraphy

Systems

Position coordinate determination for writing

178 1801, 178 1803, G08C 2100

Patent

active

059862246

ABSTRACT:
A touch sensor, having an acoustic wave transmissive medium having a surface and a touch sensitive portion of the surface, a transducer system for emitting acoustic energy into the medium, and a receiver system for receiving the acoustic energy from the substrate as at least two distinct sets of waves, a portion of each of which overlap temporally at the receiver system or overlap physically by propagating in the touch sensitive portion along axes which are substantially non-orthogonal, the receiver system determining a position or a waveform perturbing characteristic of a touch on the touch sensitive portion. The receiver may be an amplitude detector or be sensitive to a phase-amplitude characteristic of the received acoustic waves.

REFERENCES:
patent: 4642423 (1987-02-01), Adler
patent: 4644100 (1987-02-01), Brenner et al.
patent: 4746914 (1988-05-01), Adler
patent: 5072427 (1991-12-01), Knowles
patent: 5129262 (1992-07-01), White et al.
patent: 5451723 (1995-09-01), Huang et al.

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