Handheld facsimile and alphanumeric message transceiver operating over telephone or wireless networks
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United States of America Patent
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Sep 28, 1993
Grant Date -
N/A
app pub date -
Apr 18, 1991
filing date -
Apr 18, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
According to the present invention, a hand-held portable transmitter is provided which is capable of communicating with a variety of different message receiving hosts. The transmitter is provided with a technique for generating waveforms to communicate with foreign message receivers over a communication channel by using a lookup table and software implementation in combination with a telephone interface circuit. Also provided is a versatile encoding protocol in which a message is optionally converted to a four-bit, five-bit, or six-bit sequence, or to a sequence of variable-length bit-strings, the converted message is queued and regrouped as four-bit nibbles, and the nibbles are communicated by DTMF tones.
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