EP0523626B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Multipoint teleconference system employing communication channels set in ring configuration
Assignee: Hitachi Ltd
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Filing: 1992-07-14
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Granted: 1996-10-02
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Expires: 2012-07-14
Abstract
No abstract record available.
Inventors
- 👤 Yoji Shibata
- 👤 Masaaki Takizawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 15:06
CPC Classifications
H; H04; H04N; H04N21/00; H04N21/20; H04N21/23; H04N21/238; H04N21/2383; G; G09; G09B; G09B5/00; G09B5/08; G09B5/14; H04M; H04M3/00; H04M3/42; H04M3/56; H04M3/567; H04N21/40; H04N21/43; H04N21/438; H04N21/4382; H04N7/00; H04N7/14; H04N7/15; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428; H04Q2213/00; H04Q2213/13209; H04Q2213/13337
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
257 words
A multipoint teleconference system having a plurality of video telephone/teleconference terminals (1, 2, 3, 4; A, B, C, D) which are connected to digital communication channels and which transmit and receive communication frames containing video telephonic/teleconferential data, through the connected digital communication channels; characterized in: that said digital communication channels connect said plurality of video telephone/teleconference terminals in a ring configuration; and that said each video telephone/teleconference terminal comprises: generation means (200, 201, 202, 210, 211, 212) for generating the video telephonic/teleconferential data which is to be sent to the other video telephone/teleconference terminals; relay means (270) for transmitting the communication frame received from the video telephone/teleconference terminal at an upper stream position of a loop with respect to transfer of said communication frames, to the video telephone/teleconference terminal at a lower stream position of said loop so that said communication frames may revolve around said loop, said loop being formed of said digital communication channels which connect said plurality of video telephone/teleconference terminals to one another; transmission means (260) for entering the generated video telephonic/teleconferential data into said communication frame which is to be relayed by said relay means, thereby sending said generated video telephonic/teleconferential data to said other video telephone/teleconference terminals which lie on said loop; and cancellation means (220) for canceling the video telephonic/teleconferential data which was entered into said communication frame by said transmission means of said video telephone/teleconference terminal itself before and which has revolved around said loop, from within said communication frame which is to be relayed by said relay means.
Claim 2
Dependent Claim
92 words
A multipoint teleconference system according to claim 1, characterized in that the multipoint teleconference system has an ISDN (5) which transfers a communication frame around a set channel, and a plurality of video telephone/teleconference terminals which conform to CCITT Recommendation H. 320 and which are connected to the ISDN; and that at least one of said plurality of video telephone/teleconference terminals comprises: channel setting means for setting channels between the adjacent video telephone/teleconference terminals in said ISDN so that said plurality of video telephone/teleconference terminals may be connected in a ring configuration.
Claim 3
Dependent Claim
187 words
A multipoint teleconference system according to Claim 2, wherein: said communication frame is a frame stipulated in CCITT Recommendation H. 221 (hereinbelow, termed "H. 221 frame"), a frame stipulated in CCITT Recommendation H. 261 (hereinbelow, termed "H. 261 frame") is prepared in said H. 221 frame, and GOB's included in said H. 261 frame are respectively allotted to the individual video telephone/teleconference terminals; said each video telephone/teleconference terminal further comprises resumption means for resuming video data contained in the plurality of GOB's of said H. 261 frame prepared in the received H. 221 frame, into a picture of one picture frame so as to present a display output; said cancellation means cancels video data which was entered into said H. 261 frame by said transmission means of said video telephone/teleconference terminal itself before and which has revolved around said loop, from at least one GOB allotted to said video telephone/teleconference terminal itself; and said transmission means enters the generated video data into at least one GOB allotted to said video telephone/teleconference terminal itself, among said GOB's of said H. 261 frame prepared in said H. 221 frame.
Claim 4
Dependent Claim
248 words
A multipoint teleconference system according to Claim 2, wherein: said communication frame is a frame stipulated in CCITT Recommendation H. 221 (hereinbelow, termed "H. 221 frame"), and a frame stipulated in CCITT Recommendation H. 261 (hereinbelow, termed "H. 261 frame") is prepared in said H. 221 frame; said each video telephone/teleconference terminal further comprises audio data resumption means for resuming audio data into a speech so as to emit the speech; said generation means generates the video telephonic/teleconferential data including audio data; said cancellation means cancels an audio data component which was entered into said H. 261 frame by said transmission means of said video telephone/teleconference terminal itself before and which has revolved around said loop, from audio data contained in said H. 261 frame of the received H. 221 frame; said audio data resumption means resumes the audio data with said audio data component of said terminal itself canceled by said cancellation means, into the speech so as to emit said speech; and said transmission means enters new audio data into said H. 261 frame of the H. 221 frame to be relayed by said relay means, instead of said audio data contained in said H. 261 frame of said H. 221 frame received by said relay means, said new audio data being obtained in such a way that said audio data generated by said generation means is added to said audio data with said audio data component of said terminal itself canceled by said cancellation means.
Claim 5
Dependent Claim
83 words
A multipoint teleconference system according to Claim 3, wherein: said plurality of GOB's included in said H. 261 frame are divided into N (being a natural number) groups, which are respectively allotted to the N video telephone/teleconference terminals; and said resumption means of said each video telephone/teleconference terminal resumes the video data items contained in said H. 261 frame, in respective areas of one picture frame corresponding to the GOB's having contained said video data items, so as to present said display output.
Claim 6
Dependent Claim
23 words
A video telephone/teleconference terminal as defined in any preceding claim, characterized in that it is, connectible with a plurality of digital communication channels.
Claim 7
Dependent Claim
170 words
A video telephone/teleconference terminal according to claim 6 characterized in that it is connectible with an ISDN and comprises channel setting means for setting a plurality of channels between said video telephone/teleconference terminal itself and a plurality of other video telephone/teleconference terminals in said ISDN. picture frame so as to present a display output, said video data being contained in a plurality of GOB's of a frame stipulated in CCITT Recommendation H. 261 (hereinbelow, termed "H. 261 frame") and prepared in the received H. 221 frame; said transmission means enters the generated video data into at least one GOB allotted to said video telephone/teleconference terminal itself, among said plurality of GOB's of said H. 261 frame prepared in said H. 221 frame; and said cancellation means cancels video data which was entered into said H. 261 frame by said transmission means of said video telephone/teleconference terminal itself before the reception of said H. 221 frame to be relayed, from at least one GOB allotted to said video telephone/teleconference terminal itself.
Claim 8
Dependent Claim
42 words
A video telephone/teleconference terminal according to Claim 7, wherein: said communication frame is a frame stipulated in CCITT Recommendation H. 221 (hereinbelow, termed "H. 221 frame"); said video telephone/teleconference terminal comprises resumption means for resuming video data into a picture of one
Claim 9
Dependent Claim
246 words
A video telephone/teleconference terminal according to Claim 7, wherein: said communication frame is a frame stipulated in CCITT Recommendation H. 221 (hereinbelow, termed "H. 221 frame"), and a frame stipulated in CCITT Recommendation H. 261 (hereinbelow, termed "H. 261 frame") is prepared in said H. 221 frame; said video telephone/teleconference terminal comprises audio data resumption means for resuming audio data into a speech so as to emit the speech; said generation means generates the video telephonic/teleconferential data including audio data; said cancellation means cancels an audio data component which was entered into said H. 261 frame by said transmission means of said video telephone/teleconference terminal itself before the reception of said H. 221 frame, from audio data contained in said H. 261 frame of the received H. 221 frame; said audio data resumption means resumes the audio data with said audio data component of said terminal itself canceled by said cancellation means, into the speech so as to emit said speech; and said transmission means enters new audio data into said H. 261 frame of the H. 221 frame to be relayed by said relay means, instead of said audio data contained in said H. 261 frame of said H. 221 frame received by said relay means, said new audio data being obtained in such a way that said audio data generated by said generation means is added to said audio data with said audio data component of said terminal itself canceled by said cancellation means.
References Cited (Backward Citations)
No citation records indexed.
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