Telephonic communications – Plural exchange network or interconnection
Patent
1998-10-19
2000-11-14
Hong, Harry S.
Telephonic communications
Plural exchange network or interconnection
348 17, 358435, 370536, 370902, 370912, 375260, 37910006, 37910012, 379142, 379201, 379257, H04M 700, H04M 157, H04M 342, H04N 100, H04N 117
Patent
active
06148072&
ABSTRACT:
A two-line videophone can be used to initiate video communication while maintaining audio communication throughout the initiation period. A user uses a first line to initiate an analog voice call with another user. The videophone then uses a modem to initiate a video (including image and voice) link on a second line. During this initialization period, the first line continues to carry the analog audio communication. After the video link on the second line is established, voice communication can be switched to the second line. The system then uses another modem to initiate a separate video link on the first line. During the setting up of the digital link on the first line, video communication (including voice and images) continues to be carried on the second line. Consequently, there is no gap in audio communication. After the digital link on the first line is established, both the first and the second lines can be used to carry video communication.
REFERENCES:
patent: 5442457 (1995-08-01), Najafi
patent: 5859904 (1999-01-01), Huang
Advis, Inc
Hong Harry S.
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