Patent EP0254591A2 successfully refreshed from Google Patents.
EP0254591A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Teleconferencing system
Assignee: Ricoh Americas Corp
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Filing: 1987-07-24
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Granted: —
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Expires: 2007-07-24
Abstract
Abstract The teleconferencing system includes three or more audiographic teleconferencing terminals where any one of the terminals can act as a sending terminal and/or a receiving terminal during a teleconferencing session. Each terminal includes means for establishing a broadcast and listen protocol that permits a sending terminal to transmit a facsimile image to multiple receiver terminals simultaneously.
Inventors
- 👤 Robert M. Springer
- 👤 Richard L. Schmal
- 👤 Eugene H. Gavenman
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 19:10
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/32; H04N1/32037; H04N1/32064; H04N1/32069; H04N1/42
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
225 words
A teleconferencing system comprising three or more audiographic teleconferencing terminals, means for establishing and maintaining audio and facsimile image data communications between said teleconferencing terminals wherein said audio and facsimile image data communications are commonly established and maintained between all of said terminals through an audio bridge wherein any one of said terminals can act as both a sending terminal and a receiving terminal during a teleconferencing session and wherein each of said terminals includes means for transmitting said facsimile image data, where any one of said terminals can act as a sending terminal to transmit audio data simultaneously or facsimile image data simultaneously to each of the remaining of said terminals such that said remaining terminals act as receiving terminals wherein each of said terminals includes means for establishing a broadcast and listen protocol when acting as a sending terminal to insure that each of said receiving terminals is simultaneously connected and for establishing parameters for receiving facsimile image data, said sending terminal including means for generating and transmitting said audio and facsimile image data to each of said receiving terminals, each of said receiving terminals including means for printing an image corresponding to said transmitted facsimile image data, telephone speaker means for generating audio signals corresponding to said transmitted audio data, and means for acknowledging receipt of protocol parameters and facsimile image date.
Claim 2
Dependent Claim
225 words
A teleconferencing system comprising three or more audiographic teleconferencing terminals, means for establishing and maintaining audio and facsimile image data communications between said teleconferencing terminals wherein said audio and facsimile image data communications are commonly established and maintained between all of said terminals through an audio bridge wherein any one of said terminals can act as both a sending terminal and a receiving terminal during a teleconferencing session and wherein each of said terminals includes means for transmitting said facsimile image data, where any one of said terminals can act as a sending terminal to transmit audio data simultaneously or facsimile image data simultaneously to each of the remaining of said terminals such that said remaining terminals act as receiving terminals wherein each of said terminals includes means for establishing a broadcast and listen protocol when acting as a sending terminal to insure that each of said receiving terminals is simultaneously connected and for establishing parameters for receiving facsimile image data, said sending terminal including means for generating and transmitting said audio and facsimile image data to each of said receiving terminals, each of said receiving terminals including means for printing an image corresponding to said transmitted facsimile image data, telephone speaker means for generating audio signals corresponding to said transmitted audio data, and means for acknowledging receipt of protocol parameters and facsimile image date.
Claim 3
Dependent Claim
25 words
A system as in Claim 1 where each of said terminals includes printer means for printing a hard copy form of said facsimile image data.
Claim 4
Dependent Claim
34 words
A system as in Claim 3 wherein each of said terminals includes means for simultaneously and directly generating a transparency image of said facsimile image data suitable for projection using a standard overhead projector.
Claim 5
Dependent Claim
24 words
A system as in Claim 1 wherein each of said terminals includes means for alternately operating in standard facsimile mode for facsimile transmission terminals.
Claim 6
Dependent Claim
75 words
A system as in Claim 1 wherein said broadcast and listen protocol provides control means for controlling the transmission of facsimile image data simultaneously to two or more receivers by transmitting dual tone multi-frequency (DTMF) tone sets from said sending terminal to all said receiving terminals and wherein each of said receiving terminals include means for replying back to said sending terminal with responsive DTMF tone sets to establish parameters for facsimile image data communication.
Claim 7
Dependent Claim
40 words
A system as in Claim 5 wherein said protocol attempts to establish communications at a first predetemined data rate based on error rates detected in previous transmissions in order to transmit facsimile image data to all of said receiving terminals.
Claim 8
Dependent Claim
38 words
A system as in Claim 6 wherein said protocol attempts to esstablish communications at a second, different predetermined data rate if said first data rate cannot provide a sufficiently error free communication between all of said receiving terminals.
Claim 9
Dependent Claim
21 words
A system as in Claim 1 wherein each of said terminals may include a speakerphone for audibly communicating said audio data.
Claim 10
Dependent Claim
13 words
A system as in Claim 1 wherein each of said terminals is portable.
References Cited (Backward Citations)
No citation records indexed.
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