Transponder for transmitting data from digital encoding transduc

Details Transponder for transmitting data from digital encoding transduc Transponder for transmitting data from digital encoding transduc

1975-04-07

1976-08-17

Claffy, Kathleen H.

Communications: electrical

Land vehicle alarms or indicators

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

340152T, H04M 1100

Patent

active

039755894

ABSTRACT:
A transponder for connection to a telephone line for transmitting data over the telephone line from one or more measuring transducers to a data collection center having input means preventing interference with normal telephone use but recognizing an interrogating signal which activates the transponder. The transponder includes a modulator circuit for transmitting data by a plurality of different frequencies which is actuated by a frequency control circuit for controlling the frequency output of the modulator. A bit line strobe counter is connected to the measuring transducers and the frequency control circuit for obtaining bit line data, and a dial line strobe counter is connected to the measuring transducers for sequentially obtaining data from the transducer dials. A program timing means is connected to the modulator circuit, the frequency control circuit, and the strobe counters for synchronizing the timing of the transponder. Clock means are connected to the modulator, the frequency control circuit and the program timing for providing a common timing signal. The transponder responds to interrogation by transmitting serially encoded data using audio tones in the voice band.

REFERENCES:
patent: 3842206 (1974-10-01), Barsellotti et al.

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