Telephonic communications – Telephone line or system combined with diverse electrical... – To produce visual-graphic copy
Patent
1993-12-07
1996-02-06
Chan, Jason
Telephonic communications
Telephone line or system combined with diverse electrical...
To produce visual-graphic copy
379 97, 379 94, 379102, H04M 1100
Patent
active
054902100
ABSTRACT:
A programmable telephone interface device connects to a telephone subscriber line and automatically controls the operation of facsimile equipment and telephone equipment connected to the device. The device includes a microprocessor having stored programs in memory for receiving and interpreting digital signals. Ports on the device allow connection of at least one telephone, a telephone answering device, and a facsimile machine. One or more outgoing messages can be recorded and stored in memory. An AC ringing voltage on the subscriber line representing an incoming telephone call is detected by a ring detection circuit and a DC pulse detection circuit detects changes in the current on the telephone subscriber line representing pulse dials, off-hook signals, and canceled calls. Facsimile transmission (CNG) signals and dual tone multi-frequency (DTMF) tones are filtered, decoded and converted to digital signals by a filter and decoder circuit which are interpreted by the microprocessor. The microprocessor selects a port corresponding to the type of signal detected and causes a ring voltage signal to be generated to activate the telephone equipment or facsimile machine connected to the selected port. The ring voltage signal is sent to the facsimile port if the detected signal is a CNG signal or a predetermined DTMF tone representing the facsimile port, or is sent to the telephone port or the telephone answering device port if a CNG signal is not detected or if the detected signal is a predetermined DTMF tone representing a particular port.
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Chan Jason
Roddy Kenneth A.
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