Pulse or digital communications – Repeaters – Testing
Patent
1980-12-08
1982-12-28
Pitts, Harold I.
Pulse or digital communications
Repeaters
Testing
370 37, H04B 104
Patent
active
043665721
ABSTRACT:
A data transmission system including transmission stations for transmitting a plurality of different kinds of input data and receiving stations for receiving only one kind of the data transmitted from the transmission stations. A transmission station is actuated by the demand of the receiving station and the plural kinds of data are modulated at the modulation central frequency corresponding to the respective data. The demodulation central frequency of each one of the receiving units is set for only one kind of data and only one kind of data transmitted by the transmission units are demodulated in a receiving station.
REFERENCES:
patent: 2680151 (1954-06-01), Boothroyd
patent: 3259693 (1966-07-01), Watanabe
patent: 3590384 (1971-06-01), Emmasingel
patent: 3909527 (1975-09-01), Ohta
Fujiwara Ken-ichi
Okamura Shigeru
Takatsuki Toshiharu
Yanagisawa Sinobu
Mitsubishi Denki & Kabushiki Kaisha
Nippon Telegraph & Telephone Public Corporaton
Pitts Harold I.
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