Data communication system

Details Data communication system Data communication system

1981-09-14

1984-08-14

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

328167, H04B 138

Patent

active

044661070

ABSTRACT:
A data communication system in which a digital signal is applied directly to a limited bandwidth data link, such as a telephone line. Harmonies of the digital signal are attenuated either by a low-pass filter or by the limited bandwidth of the data link so that only the fundamental component of the digital signal passes through the data link. The resulting digital signal at the other end of the data link is differentiated and applied to a Schmidt trigger, which recreates the original digital signal. The data communication system may be connected to a digital device through an interface circuit which supplies appropriate signals for the serial I/O port of the digital device.

REFERENCES:
patent: 3324398 (1967-06-01), Moore
patent: 3761622 (1973-09-01), Stucklen
patent: 3793486 (1974-02-01), Koziol
patent: 4006465 (1977-02-01), Cross
patent: 4037049 (1977-07-01), Lyon
patent: 4115738 (1978-09-01), Mitarai et al.
patent: 4271505 (1981-06-01), Menot et al.

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