Capacitive coupling type data transmission circuit for portable

Details Capacitive coupling type data transmission circuit for portable Capacitive coupling type data transmission circuit for portable

1984-12-19

1988-08-09

Griffin, Robert L.

Pulse or digital communications

Spread spectrum

Direct sequence

455 41, 34087037, H04J 2300, H01J 938

Patent

active

047633409

ABSTRACT:
A capacitive type coupling data transmission system for portable electronic apparatus is comprised of an input circuit, a capacitance changing circuit, a transmitting circuit capacitively coupled to, a receiving circuit, and a detecting circuit for detecting any change in the capacitance changing circuit. A data signal to be transmitted is inputted into the input circuit. Based on the value of an inputted binary digital data signal, the capacitance of the capacitance changing circuit is changed. The capacitance change is capacitively transmitted from the transmitting circuit to the receiving circuit and detected thereat. The detecting circuit may be an oscillator circuit, a an RC differentiating circuit, or an RC integrating circuit.

REFERENCES:
patent: 1318165 (1919-10-01), McCullough
patent: 1899527 (1933-02-01), Purington
patent: 3265972 (1966-08-01), Curry
patent: 4255812 (1981-03-01), Huellwegen
patent: 4462107 (1984-07-01), Vance

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