Telecommunications – Transmitter and receiver at separate stations – Distortion – noise – or other interference prevention,...
Patent
1989-10-11
1992-04-28
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
Distortion, noise, or other interference prevention,...
307542, 455284, 455305, H04B 110, H04B 1500
Patent
active
051095335
ABSTRACT:
An industrial measuring apparatus comprises first and second sensors having identical measuring characteristics and arranged close to each other and also close to a common subject of measurement, for measuring the same parameter, a transmitting unit having an adder and a first subtracter respectively connected the sensors through amplifiers, and a receiving unit having a second subtracter connected to the adder and the first subtracter through two transmission lines and constituting a noise canceling device in cooperation with the adder and the first subtracter. The second subtracter produces a receiving signal by subtracting the output of the subtracter representing the difference between the outputs of the first and second sensors from the output of the adder representing the sum of the outputs of the two sensors. Noise superposed on the outputs of the adder and subtracter during transmission is canceled out when the receiving signal is produced, whereby a receiving signal exactly corresponding to the sensor signal is easily obtained.
REFERENCES:
patent: 4752741 (1988-06-01), Kim et al.
Katsuta Hiroshi
Mine Katsutoshi
Morimoto Yuji
Ogawa Koji
Wakabayashi Katsuyoshi
Eisenzopf Reinhard J.
Pham Chi H.
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