05502727 is referenced by 73 patents and cites 7 patents.

A telephone apparatus enables the approximate simultaneous transmission and reception of audio interleaved with image and graphical annotation signals, in data packet form, over an analog line which connects the apparatus to a switched telephone network. The audio data packets are transmitted at a periodic rate, during a first time interval, and the image and annotation data packets are transmitted during a second time interval, following the first time interval, enabling the simultaneous output of voice, image and annotation data at the receiver site. Control data packets, as needed, are also transmitted during the second time interval for end-to-end apparatus control. One feature enables the transmission of audio data packets at a first periodic rate, when in an image transmission mode, and at a second periodic rate, faster than the first periodic rate, when not in the image transmission mode.

Title
Image and audio communication system having graphical annotation capability
Application Number
8/49727
Publication Number
5502727
Application Date
April 20, 1993
Publication Date
March 26, 1996
Inventor
John F Ribera
Howell
NJ, US
Minakanagurki V Ranganath
Lincroft
NJ, US
Jerome Prestinario
Bridgewater
NJ, US
Mahendra Pratap
Cliffwood Beach
NJ, US
Charles Hull
Wall
NJ, US
Steven C Dzik
Somerset
NJ, US
Anthony J Catanzaro
Jackson
NJ, US
Agent
John A Caccuro
Assignee
AT&T
NJ, US
IPC
H04M 11/00
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