Data communication system
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United States of America Patent
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Aug 14, 1984
Grant Date -
N/A
app pub date -
Sep 14, 1981
filing date -
Sep 14, 1981
priority date (Note) -
Expired
status (Latency Note)
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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.
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