Handheld facsimile and alphanumeric message transceiver operatin

Details Handheld facsimile and alphanumeric message transceiver operatin Handheld facsimile and alphanumeric message transceiver operatin

1991-04-18

1993-09-28

Dwyer, James L.

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

379 96, 379 97, 379100, 341106, 341 65, 341 67, 375 56, H04M 1100, H03M 740, H04L 2710

Patent

active

052492206

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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patent: 5055841 (1991-10-01), Cordell

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