Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1982-12-08
1986-01-28
Krass, Errol A.
Communications: electrical
Audible indication
Percussion-type sound producer
324115, 340347CC, H03M 110
Patent
active
045674663
ABSTRACT:
A sensor communication system uses a shared analog signal to duty cycle converter for producing a comparison between a predetermined free-running triangular waveshape and a selected output signal from a plurality of analog signal sources such as process sensors, to convert the amplitude of the analog signal to a variable duty cycle signal. The variable duty cycle signal is subsequently converted to a digital signal which may be represented by a count stored in a counter counting clock pulses during the occurrence of the pulse width waveshape of the variable duty cycle signal. The digital signal is utilized as a digital word by a microprocessor operating in accordance with a stored program to produce a characterized digital output signal for use in a communication after conversion to a 4-20 ma control signal for communication and control in an industrial process control system. One of the signal sources may be from a circuit having temperature and time drift components whereby the corresponding digital word is used by the microprocessor to compensate the digital words from the other analog signal sources.
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Millman, "Microelectronics", McGraw-Hill Book Co., 1979, pp. 627, 628, 646.
Bozarth Theodore B.
Demark Anthony M.
Finn Edward F.
Lynch Frank
Halista Mitchell J.
Honeywell Inc.
Joike Trevor B.
Krass Errol A.
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