Modem

Details Modem Modem

1998-08-24

2000-09-12

Woo, Stella

Telephonic communications

Telephone line or system combined with diverse electrical...

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

379 9309, 379142, H04M 1100

Patent

active

061188573

ABSTRACT:
The data transmission apparatus has a subscriber connection for a telephone subscriber line and a data connection for connection to a computer. A modulator section converts the digital data received from the computer into a transmission signal which is suitable for transmission via the telephone subscriber line. A demodulator section converts the signal received from the telephone subscriber line into a digital data stream. The data transmission apparatus has a device for detecting a special signal that is contained in the received signal at times. The special signal may be, in particular, a call-waiting signal injected into the subscriber line at an exchange while a call is waiting.

REFERENCES:
patent: 3644830 (1972-02-01), Ragsdale
patent: 4995074 (1991-02-01), Goldman et al.
patent: 5287401 (1994-02-01), Lin
patent: 5493609 (1996-02-01), Winseck, Jr. et al.
patent: 5513251 (1996-04-01), Rochkind et al.
patent: 5519767 (1996-05-01), O'Horo et al.
patent: 5930347 (1999-07-01), Louvel
International Patent Application WO 96/02104 (Winseck et al.), dated Jan. 25, 1996.
International mPatent Application WO 97/37483 (Foladare et al.), dated Oct. 9, 1997.
Published International Application No. 96/02104 (Winseck et al.), dated Jan. 25, 1996.

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