Touch entry system with ambient compensation and programmable am

Details Touch entry system with ambient compensation and programmable am Touch entry system with ambient compensation and programmable am

1988-09-02

1991-01-29

Oberley, Alvin E.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

341 31, 250221, G06K 1106, H03K 1794

Patent

active

049889834

ABSTRACT:
A touch input device having infrared light beams defined by a plurality of pairs of light emitters and phototransistors is disclosed. A feedback loop containing a programmable amplifier is employed to compensate for the effects of ambient light and for device irregularities. The phototransistor current is first converted to a signal voltage by an operational amplifier and then is input into a low pass filter. The output of the lowpass filter is input into a feedback loop containing a summing amplifier, a programmable amplifier and an integrator. As light emitters and phototransistors are sequentially activated, the feedback loop with the programmable amplifier compares outputs signals in the unactivated state with those input when the light emitters are activated to compensate for ambient conditions and errors.

REFERENCES:
patent: 4243879 (1981-01-01), Carroll et al.
patent: 4267443 (1981-05-01), Carroll et al.
patent: 4591710 (1986-05-01), Komandina et al.
patent: 4645920 (1987-02-01), Carroll et al.
patent: 4684801 (1989-08-01), Carroll et al.
patent: 4701747 (1989-10-01), Isherwood et al.

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