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    Video conferencing system
    2.
    发明专利
    Video conferencing system 未知

    公开(公告)号：GB2281672A

    公开(公告)日：1995-03-08

    申请号：GB9318301

    申请日：1993-09-03

    Applicant: IBM

    Inventor： BARRACLOUGH KEITH ROBERT ,  GAY ADRIAN CHARLES

    IPC: H04N7/15

    Abstract: 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.

    3.
    发明专利
    未知

    公开(公告)号：DE68920144D1

    公开(公告)日：1995-02-02

    申请号：DE68920144

    申请日：1989-10-12

    Applicant: IBM

    Inventor： BUTLER NICHOLAS ,  GAY ADRIAN CHARLES

    IPC: G09G5/36 ,  G06T11/40 ,  G09G5/393 ,  G09G1/16

    Abstract: A computer graphics system is presented, having display logic (92) comprising a destination bit map (11) containing a plurality of image bits which map to a plurality of pixels for presenting an image, an auxiliary bit map (1) containing a plurality of area boundary bits representing pixels defining an area boundary line which encloses an area of the image, area filling logic (7) for operating upon those image bits enclosed by the area boundary line in order to fill the area with a particular pattern and colour, characterised in that the display logic further comprises area boundary drawing logic (5) having line segmentation means to resolve the specified boundary line into a plurality of intersecting two pixel line segments which can, from that time forward, be operated upon separately to define the area boundary bits in accordance with conventional area boundary drawing rules.

    GRAPHICS PROCESSING SYSTEM TESTS FOR CONVEX IMAGE AREAS
    4.
    发明专利
    GRAPHICS PROCESSING SYSTEM TESTS FOR CONVEX IMAGE AREAS 未知

    公开(公告)号：GB2198019A

    公开(公告)日：1988-06-02

    申请号：GB8627552

    申请日：1986-11-18

    Applicant: IBM

    Inventor： EASTON COLIN JOHN ,  GAY ADRIAN CHARLES

    IPC: G06F3/153 ,  G06T11/00 ,  G06T11/20 ,  G09G5/393 ,  G06F15/70

    Abstract: A graphics processing system has means for generating a map (26) of an image in terms of the individual picture elements or pixels from data (20) defining the boundaries of component areas of the image. The generating means comprises a plurality of paired storage locations called a convex area table (32). Each pair of storage locations is associated with a line of individual picture elements on the image. Processing logic 22 computes display line and displacement values from the boundary information and stores each displacement area value in a free one of the pair of locations for the corresponding display line. The stored displacement values can then be used for generating the full pixel map of the image.

    6.
    发明专利
    未知

    公开(公告)号：DE3784014D1

    公开(公告)日：1993-03-18

    申请号：DE3784014

    申请日：1987-09-18

    Applicant: IBM

    Inventor： EASTON COLIN JOHN ,  GAY ADRIAN CHARLES

    IPC: G06F3/153 ,  G06T11/00 ,  G06T11/20 ,  G09G5/393 ,  G09G1/16 ,  G06F15/62

    Abstract: A graphics processing system has means for generating a map (26) of an image in terms of the individual picture elements or pixels from data (20) defining the boundaries of component areas of the image. The generating means comprises a plurality of paired storage locations called a convex area table (32). Each pair of storage locations is associated with a line of individual picture elements on the image. Processing logic 22 computes display line and displacement values from the boundary information and stores each displacement area value in a free one of the pair of locations for the corresponding display line. The stored displacement values can then be used for generating the full pixel map of the image.

    Audio conferencing system
    8.
    发明专利
    Audio conferencing system 未知

    公开(公告)号：GB2284968A

    公开(公告)日：1995-06-21

    申请号：GB9325924

    申请日：1993-12-18

    Applicant: IBM

    Inventor： BARRACLOUGH KEITH ROBERT ,  CRIPPS PETER ,  GAY ADRIAN CHARLES

    IPC: G06F13/00 ,  H04L12/18 ,  H04M3/56 ,  G06F15/00 ,  H04N7/15 ,  H04Q11/04 ,  H04L12/28

    Abstract: A computer workstation receives multiple audio input streams over a network in an audio conference. The audio input streams are kept separate by storing them in different queues. Digital samples from each of the queues are transferred to an audio adapter card 28 for output. A digital signal processor 46 on the audio adapter card multiplies each audio stream by its own weighting parameter, before summing the audio streams together for output. Thus the relative volume of each of the audio output streams can be controlled. For each block of audio data, the volume is calculated and displayed to the user, allowing the user to see the volume in each audio input stream independently. The user is also provided with volume control for each audio input stream, which effectively adjusts the weighting parameter, thereby allowing the user to alter the relative volumes of each speaker in the conference.

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