Method and apparatus for transmitting analog data embedded in a

Details Method and apparatus for transmitting analog data embedded in a Method and apparatus for transmitting analog data embedded in a

1989-09-08

1991-04-09

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 10, 3701054, 370112, 375 22, 375113, H03C 104, H03K 364

Patent

active

050070428

ABSTRACT:
A method and apparatus for digitizing and transmitting one or more analog signals simultaneously over a two-wire line. The two-wire line not only provides the power required for the digitizing circuit and sensor, but is used also to transmit the analog information in a digital pulse train encoded with the power supply current. All data pulses are transmitted as the quiescent current of each analog coder module and its associated transducers connected to it. These data pulses start and end by transmission of a digital sync current pulse which separates transmission of each analog data pulse. The width of each data pulse conveys the desired information. A circuit for generating the pulse train having only two amplitudes but pulses having a variable width includes an SR flip-flop coupled to the output stage. The timing of the SR flip-flop being set and reset is determined by the analog data, thus providing an output pulse train having one of two amplitudes and a variable width, the width being proportional to the data conveyed within the pulse train. An analog zero voltage level width pulse and an analog high voltage level width pulse are transmitted in the same pulse train as the analog data to eliminate any temperature or component drifts in sensitive analog-sensing circuits. A formula is given to implement an auto calibration technique.

REFERENCES:
patent: 2724017 (1955-11-01), Heeren et al.
patent: 2736772 (1956-02-01), Burnight
patent: 3257651 (1966-06-01), Feisel
patent: 3991379 (1976-11-01), Chadwick et al.
patent: 4620312 (1986-10-01), Yamashita

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