Remote telemetry unit

Details Remote telemetry unit Remote telemetry unit

1983-10-06

1985-10-22

George, Keith E.

179 2AM, H04M 1104

Patent

active

045490449

ABSTRACT:
A remote-telemetry unit for monitoring and reporting to a remote location over a telephone line the condition of an associated piece of equipment at predetermined times, when polled and when the equipment condition dictates, the unit including a direct access arrangement, a switched-frequency Friend Biquad type filter and a detector, the combination for detecting tone signals developed on the line, and a digital-to-analog converter and a controller, in combination with the direct access arrangement for developing on the line tone signals for dialing and for condition reporting.

REFERENCES:
patent: 4086434 (1978-04-01), Bocchi
patent: 4162488 (1979-07-01), Silverman et al.
patent: 4241237 (1980-12-01), Paraskevakos et al.
patent: 4284849 (1981-08-01), Anderson et al.
patent: 4394540 (1983-07-01), Willis et al.
patent: 4415774 (1983-11-01), Driver
patent: 4436956 (1984-03-01), Schreiber

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