Abstract: An apparatus and method as shown automatically selects a video stream of a video-conference for transmission or display. The apparatus and method includes a receiving step for receiving video and audio streams over a network from participants in a video-conference. Each of the audio streams each has amplitude data. A suppressing step suppresses some of either the first or second video stream based on the amplitude data of the corresponding audio stream. The video stream or streams that are not suppressed are either displayed on a display screen of a participant of the video conference or transmitted to other terminals for display on display screens.

Abstract: A digitized image compression system employs several different compression techniques to compress the luminance and chrominance information and encodes the selected technique “on the fly” by inserting selected escape and header codes into the encoded data stream. More particularly, during compression, each image is divided into non-overlapping contiguous regions, referred to hereinafter as blocks and image data is compressed on a block-by-block basis. Each encoded block begins with a one-byte header that indicates, in conjunction with a previous escape code, the compression technique which was used to encode the block. Therefore, interpretation of the encoded data is a hierarchical process: the escape codes indicate a stream interpretation mode which, in turn, determine the meaning of header values which follow and the header values, in turn, determine the meaning of the encoded data in each block.

Abstract: A load tap changer (LTC) comprising in part a diverter switch is disclosed. The diverter switch includes a movable main contact (38); first and second fixed main contacts (40a, 40b); a pantograph system (30) for translating a rotational motion of a shaft (22) to a substantially linear motion of the movable main contact; and a link system (10) comprising a gear (12) adapted to be rotated by a motor, a spring battery (26) for storing energy of the motor, link means (14, 16, 18) for coupling the gear to the spring battery, and the shaft (22) coupled to the link means, wherein the spring battery is operable to rotate the shaft and to thereby effect the movement of the movable main contact. A predetermined amount of rotation of the shaft effects a movement of the movable main contact from a contacting relation with the first fixed main contact to a contacting relation with the second fixed main contact.

Abstract: Decompression of video segments from a sequence of differential frames is done by selected scaling of frame resolution and color depth. A frame header indicates the computational complexity of decompression of a frame, allowing selection of scales for output resolution and color depth. Decompression proceeds by retrieving a frame from the compressed video stream in elementary units. An elementary unit is characterized by types, including an unchanged type, a homogeneous type, a pattern type and a predetermined pattern type. For a retrieved elementary unit of the unchanged type, an output pointer to a display buffer is moved by an elementary unit scaled by the output resolution scale. For a retrieved elementary unit of the homogeneous type, a color retrieved from the compressed video stream is applied to an area in the display buffer corresponding to an elementary unit scaled by the output resolution scale.

Abstract: Data transfers between a workstation bus and a graphics adapter bus are handled by a plurality of first-in-first-out (FIFO) buffers, each of which is independently operable to transfer data in a selected direction between the two buses. The FIFOs are accessible either directly by the workstation processor or by means of a DMA operation. Each FIFO is assigned a unique range of addresses in the address space of the workstation processor to permit a workstation process to transfer a block of data to or from a selected FIFO using a single instruction. Workstation writes (reads) to a FIFO are suspended in response to a first status signal indicating that the high (low) threshold for that FIFO has been reached and are restarted in response to a second status signal indicating that the low (high) threshold has been reached.