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公开(公告)号：EP0650285A1
公开(公告)日：1995-04-26
申请号：EP94302044.6
申请日：1994-03-22
IPC分类号： H04M3/56 , H04L12/433
摘要： The present invention provides communication apparatus for an audio conference which can operate in a limited bandwidth environment. The audio conferencing terminals are arranged to form part of a token ring. Audio data is passed cyclically between the terminals using an audio data packet in a conventional manner. Each audio communication terminal to transmits audio data to its logical successor only when it is in possession of the audio data packet. Each audio communication terminal upon receiving the audio data packet extracts therefrom and outputs to a user of the terminal the audio data contained therein. The audio communication terminal in possession of the audio data packet adds a respective block of digitised audio, comprising current digitised audio samples, to the audio data packet. The audio data packet is then passed to logical successor of the audio communication terminal. Consequently, the audio data packet upon at least one circulation around the token ring comprises audio data which represents the summation or superposition of all of the current digitised audio samples of the parties to the audio conference.
摘要翻译： 本发明提供了可在有限带宽环境中工作的用于音频会议的通信装置。 音频会议终端被布置成形成令牌环的一部分。 音频数据以常规方式使用音频数据分组在终端之间循环地传送。 每个音频通信终端只有在拥有音频数据包时才将音频数据发送到其逻辑后继。 每个音频通信终端在接收到音频数据分组时从中提取音频数据分组，并向终端的用户输出其中包含的音频数据。 拥有音频数据分组的音频通信终端将包括当前数字化音频样本的相应的数字化音频块添加到音频数据分组。 音频数据包然后被传递到音频通信终端的逻辑后继。 因此，在令牌环周围的至少一个循环处的音频数据包包括音频数据，其表示音频会议的各方的所有当前数字化音频样本的总和或叠加。
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公开(公告)号：EP0642271A1
公开(公告)日：1995-03-08
申请号：EP94305359.5
申请日：1994-07-20
IPC分类号： H04N7/15
摘要： In a video conference between a number N of parties, each video conferencing terminal produces a respective video signal comprising, in the case of the NTSC standard, sixty fields per second. These are input to an analog multi-point control unit which selects every Nth field from each input video signal and derives therefrom a single output video signal also of sixty fields per second, in which consecutive fields are derived cyclically from each of the N input video signals in turn. The single output video signal is transmitted to each video conferencing terminal, which separates out the fields of the input video signals present in the single output video signal to provide N individual reduced field rate video signals each comprising 60/N fields per second and each having fields derived from a respective one of the input video signals.
摘要翻译： 在N个派对之间的视频会议中，每个视频会议终端产生相应的视频信号，在NTSC标准的情况下，包括每秒60个字段。 这些输入到模拟多点控制单元，该模拟多点控制单元从每个输入视频信号中选择每第N个场，并从其中导出每秒六十场的单个输出视频信号，其中连续场从N个输入视频中的每一个循环导出 信号反过来。 单输出视频信号被发送到每个视频会议终端，每个视频会议终端分离存在于单输出视频信号中的输入视频信号的场，以提供每个包括每秒60 / N场的N个单独的减小的视场信号，每个具有 从相应的一个输入视频信号导出的场。
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公开(公告)号：EP0429728B1
公开(公告)日：1994-06-15
申请号：EP89312532.8
申请日：1989-11-30
IPC分类号： G01R31/318 , G11C19/00
CPC分类号： G01R31/318558 , G01R31/318552 , G06F1/10 , G11C19/00
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公开(公告)号：EP0634857B1
公开(公告)日：2001-11-07
申请号：EP94304281.2
申请日：1994-06-14
IPC分类号： H04L29/06
CPC分类号： H04N21/2368 , H04L12/1813 , H04L12/64 , H04M3/567 , H04N7/15 , H04N21/23614 , H04N21/4307 , H04N21/4341 , H04N21/4348
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公开(公告)号：EP0634857A2
公开(公告)日：1995-01-18
申请号：EP94304281.2
申请日：1994-06-14
IPC分类号： H04L29/06
CPC分类号： H04N21/2368 , H04L12/1813 , H04L12/64 , H04M3/567 , H04N7/15 , H04N21/23614 , H04N21/4307 , H04N21/4341 , H04N21/4348
摘要： The present invention relates a communication terminal for the synchronisation of audio and visual information within a communication system. Audio communication between the parties to a video conference is achieved by digitising the speech and transmitting the same over a packet based data network. Each party to the conference can draw the attention of the other party to an object on the screen using a pointer controlled by, say, a mouse or ball. The co-ordinates of each parties' pointer are incorporated, via a multiplexer, into the data packets containing the digitised speech and transmitted to the other party's terminal thereby ensuring the synchronisation the pointer information with the digitised speech.
摘要翻译： 本发明涉及通信终端，用于通信系统内的音视频信息的同步。 视频会议的各方之间的音频通信是通过数字化语音并通过基于分组的数据网络发送它来实现的。 会议的每一方可以使用由鼠标或球控制的指针，将对方的注意力吸引到屏幕上的对象上。 各方指针的坐标通过多路复用器被并入到包含数字化语音的数据分组中，并被发送到另一方的终端，从而确保指针信息与数字化语音的同步。
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公开(公告)号：EP0429728A1
公开(公告)日：1991-06-05
申请号：EP89312532.8
申请日：1989-11-30
IPC分类号： G01R31/318 , G11C19/00
CPC分类号： G01R31/318558 , G01R31/318552 , G06F1/10 , G11C19/00
摘要： A logic circuit is presented comprising a plurality of registers 30, 39; each register 30 having first register latches 31, 41 for clocking data into the register 30 in response to a first clock signal 37 and second register latches for clocking data out of the register in response to a second clock signal 38, and combinatorial logic comprising address logic 4 for addressing data to a register and first suppression logic 33 for inhibiting the first clock signal input to the register in responsive to the address logic, wherein the logic circuit further comprises second suppression logic 34, 35 for inhibiting the second clock signal input to the register in collective response to the address logic and the first clock signal.
摘要翻译： 呈现包括多个寄存器30,39的逻辑电路; 每个寄存器30具有第一寄存器锁存器31,41，用于响应于第一时钟信号37将数据计时到寄存器30中;以及第二寄存器锁存器，用于响应于第二时钟信号38将数据输出寄存器;以及组合逻辑，包括地址 用于将数据寻址到寄存器的逻辑4和用于响应于地址逻辑禁止输入到寄存器的第一时钟信号的第一抑制逻辑33，其中逻辑电路还包括第二抑制逻辑34,35，用于禁止第二时钟信号输入 该寄存器集中响应地址逻辑和第一个时钟信号。
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