Text transmission using DTMF signalling
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United States of America Patent
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-
Dec 16, 1997
Grant Date -
N/A
app pub date -
Apr 21, 1995
filing date -
Apr 21, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method and system for transmitting text information using multifrequency signals is provided. A switching center transmits a first multifrequency signal indicating the start of a text transmission. A receiver unit receives the first multifrequency signal and prepares to receive text information. The switching center transmits to the receiver unit a second and third multifrequency signals after the first multifrequency signal. The second and third multifrequency signals contain information corresponding to a text character. The receiver unit receives the second and third multifrequency signals and determines the text character transmitted. The switching center transmits a fourth multifrequency signal to the receiver unit indicating the end of the text transmission.
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