Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1995-03-28
1996-01-16
Mullen, Thomas
Communications: electrical
Condition responsive indicating system
Specific condition
340555, 340692, 359155, 364554, G08B 2300
Patent
active
054851394
ABSTRACT:
A system for presenting automatic verbal announcement by means of active infrared detection in conjunction with a digital voice recorder/playback unit includes a modulated infrared signal generator for generating a signal of given frequency at a target when in a sensing range, a detector for detecting a modulated infrared signal of the given frequency reflected from a target within the sensing range, a digital voice recorder/playback unit for recording and then providing announcements, when a target is within the sensing range, a speaker to provide an audible output from a signal generated by the digital unit and a microprocessor operatively connected to the generator to periodically output a modulated signal from the generator, to the detector for receiving a signal of the given frequency when a target is within the sensing range and to the digital unit for sending a signal to same and initiate an announcement when a signal is received from the detector. Various switches are provided to allow for different modes of operation. The system also provides for the taking of statistical data.
REFERENCES:
patent: 4166273 (1979-08-01), Riley, Jr. et al.
patent: 4338594 (1982-07-01), Holm
patent: 4512000 (1985-04-01), Masuko
patent: 4670798 (1987-06-01), Campbell et al.
patent: 5264822 (1993-11-01), Vogelman et al.
patent: 5295064 (1994-03-01), Malec et al.
Mullen Thomas
Spiegel Joseph L.
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