H - Electricity – 04 – M
Patent
H - Electricity
04
M
363/10, 325/17,
H04M 11/00 (2006.01) H04B 1/59 (2006.01) H04B 3/50 (2006.01)
Patent
CA 1038979
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 con- trolling 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, 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.
249647
Ebner Theran L.
Hawkins Donald W.
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