Pulse or digital communications – Repeaters – Testing
Patent
1983-10-11
1987-08-25
Olms, Douglas W.
Pulse or digital communications
Repeaters
Testing
H04B 138, H04L 2710
Patent
active
046898018
ABSTRACT:
A microprocessor-based frequency shift keying (FSK) data communications module. The microprocessor selectively modulates and demodulates data directly in terms of a square wave pulse train in which a first frequency is used to convey a binary "1" and a second frequency to convey a binary "0". An input and an output port on the microprocessor are selectively coupled to a transmission line through a transformer, by means of electronic switches. Also included are a bandpass filter for shaping the square waves into sine waves and for filtering noise, and means including a notch filter for generating a carrier detect signal input to the microprocessor, when incoming data is detected on the transmission line. Many of the components in the module are used for both transmitting and receiving data.
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Nurczyk Mark E.
Wilson Patrick J.
Wood Tony J.
American Standard Inc.
Anderson Ronald M.
Beres William J.
Harter Robert J.
Olms Douglas W.
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