Abstract: A communication system is provided for use in processing systems and the like for carrying out data transfer operations between a first data bus and a peripheral device associated with a second data bus, wherein the first data bus operates at a first clock speed and wherein the second data bus operates. at a second clock speed which is different from the first clock speed and a 1/N integer multiple of the first clock speed. A sample signal associated with the second clock speed is received and the speed of operation of a state machine of a peripheral controller is dynamically adjusted in response to the sample signal such that the state machine of the peripheral controller operates at the second clock speed and causes operations on the second data bus to occur synchronously at the second clock speed.
April 10, 1998
Date of Patent:
January 7, 2003
International Business Machines Corporation
Richard Gerard Hofmann, Mark Michael Schaffer, Thomas Andrew Sartorius
Abstract: An external memory interface in a DVMPEG converter inputs/outputs DV data, which has been decoded by a DV decoder, to/from an external memory. Moreover, a format converter receives data, which is read out from the external memory via the external memory interface, and converts the format thereof from a DV format to an MPEG format. Then, an MPEG encoder encodes the DV data whose format has been converted so as to produce MPEG data. Thus, it is possible to provide a DVMPEG converter having a small circuit scale.
May 7, 2002
December 26, 2002
Matsushita Electric Industrial Co., Ltd.
Abstract: The invention discloses a method of sending pictures for display individually or as a series of pictures in a mini-clip on a receiving device during a lengthy file transfer. The invention, although not strictly limited to, is particularly suitable for use in a Bluetooth environment using the Object Exchange (OBEX) protocol. In an embodiment of the invention, a picture or series of pictures (710,720,730) are encapsulated within a Application Parameters header of the ongoing long file transfer. When picture data is too large to fit into a single header the data may be segmented and spanned over several headers. The headers contain parameters that define display characteristics such as picture display time and mini-clip or series refresh rate, thereby lending the method particularly well for the display of advertising content.
Abstract: A multimedia decoder supports a plurality of functions and communicates on at least one physical communication link. The decoder includes a first processor for decoding data packetized according to an Internet protocol data format to provide a first decoded output. The decoder also includes a second processor for encoding data according to the Internet protocol data format for return communication to a broadcast source. The decoder prioritizes received data for processing by the first processor and prioritizes data for encoding for return communication by the second processor. The received data and the data for encoding are allocated a desired hierarchical data output priority based on a function or a protocol characteristic of the data to be prioritized.
Abstract: A transmission interface compatible with the AT Attachment Packet Interface (ATAPI) that achieves transfer rates greater than those possible with an Integrated Disc Electronics (IDE) bus. The transmission interface includes a transmission ATAPI circuit, a packetizing circuit and a converter. The transmission ATAPI circuit monitors the content of the ATAPI and, when a change is detected, generates a first set of signals representative of that change. The first set of signals are single-ended, parallel to one another and use Transistor-Transistor Logic (TTL) voltage levels. The packetizing circuit packetizes the first set of signals to generate a second set of signals, which representing a packet. The packet payload represents the change in the contents of the ATAPI. The second set of signals are also single-ended, parallel to one another and use TTL voltage levels. The converter converts the second set of signals into a third set of signals and couples these to a serial bus.
Abstract: In a multiplex transmission method, a plurality of digital signals having different frame lengths and bit-synchronized at the same signal rate are transmitted after the signals are multiplexed in a predetermined order. The received multiplexed signal is demultiplexed. A predetermined sync pattern is detected from each digital signal obtained by demultiplexing. The output position of each digital signal is determined on the basis of the sync pattern detection result. A multiplex transmission system is also disclosed.
Abstract: A requesting terminal includes an interface that allows a user to select whether data downloaded from a network (such as the Internet) is transmitted to the requesting terminal via a high-speed link, such as a satellite link, or a lower speed link, such as a terrestrial link. Preferably, the terrestrial link (which may comprise a conventional dial-up Internet connection) is a two-way link, wherein the requesting terminal transmits data requests to the network via the terrestrial link. The data requests generated by the requesting terminal are modified to designate whether the requested data should be downloaded from the network via the terrestrial link or the satellite link. The terrestrial link may also be automatically selected for certain applications.
Abstract: A novel and improved method and system for paging a cellular telephone or other wireless terminal using two paging channels that reduces standby mode power consumption described. In one embodiment of the invention, a minimally encoded quick paging channel is established over which short, quick page messages are transmitted during one of a set of quick paging slots. The quick page message indicates that a communications request has been received, and that the receiving communication terminals should process a highly encoded full paging channel over which more detailed, full page messages are transmitted during the next full paging slot. A terminal monitors full paging channel only after a quick page message has been received on the quick paging channel.
Abstract: A distributed telecommunications switching system (100) is disclosed. The system includes a controller (140) that generates and transmits a cell stream with a plurality of reserved cells. A first switching subsystem (104) in communication with the controller (140) receives the cell stream and a first plurality of cells. The first switching subsystem (104) identifies the reserved cells in the cell stream and replaces selected ones of the reserved cells with selected ones of the first plurality of cells to produce a modified cell stream. The modified cell stream is transmitted to a second switching subsystem (102).
December 4, 1997
Date of Patent:
April 11, 2000
Alcatel USA Sourcing, L.P.
Daniel J. Kerns, Paul M. Elliott, Dieter H. Nattkemper
Abstract: A communication system comprising a hub slot adapted to receive any one of a plurality of hub cards for receiving and transmitting data cells; a plurality of universal card slots; a plurality of interface cards insertable in any one of the plurality of universal card slots for receiving incoming ones of the data cells containing data and transmitting outgoing ones of the data cells containing data; an add bus having respective data links connected between individual ones of the universal card slots and the hub slot for receiving the outgoing ones of the data cells from the plurality of interface cards and transmitting the outgoing ones of the data cells to the hub slot; a drop bus having a single data link connected between all of the universal card slots and the hub slot for transmitting the incoming ones of the data cells from the hub slot to the plurality of interface cards; and an arrangement within each of the interface cards for filtering the incoming ones of the data cells from the drop bus and thereby
October 24, 1996
Date of Patent:
December 7, 1999
Newbridge Networks Corporation
Henry Chow, Michael Gassewitz, Jim Ghadbane, Charles Mitchell, Germain Bisson, Steve Bews
Abstract: In a multipoint video conference controlling system which is supplied with video packets and audio packets from conference terminals, multiplexes the video packets to produce a composite video packet, and mixes the audio packets to produce a mixed audio packet, a sequence number collating device collates the sequence numbers of the video packets and the audio packets to produce a coincidence signal when the sequence numbers of the video packets and the audio packets coincide with each other. Video and audio transmitting devices transmit synchronously the composite video packet and the mixed audio packet in response to the coincidence signal. The multipoint video conference controlling system may comprise video and audio sequence number processing devices which add one of sequence numbers to the composite packet and the mixed audio packet when the video packets and the audio packets have the sequence numbers.
Abstract: A network (10) includes a repeater (12) that can service data devices that operate using different communications protocols. The data devices (18, 20, 22) couple to the ports (34) of the repeater (12), and operate using a first communications protocol in a first domain (14). The data devices (26, 28, 30) also couple to the ports (34) of the repeater (12) and operate using a second communications protocol in a second domain (16). Information on the operation of a port (34) may be displayed using one port indicator (202) or two port indicators (300, 302).
Abstract: The wide area network includes a plurality of local area networks (LANs) in communication with a remote source. Each of the LANs includes a plurality of workstations. The workstations generate data packets for delivery to other workstations in the LAN. A packet assembly channel receives data packets from the workstations and routes the received data packets through the workstations to a LAN broadcast unit. The LAN broadcast unit broadcasts data packets generated by the workstations to each of the workstations via a LAN broadcast channel. The remote source generates data packets for delivery to the workstations in each of the LANs. Each LAN has a remote broadcast unit in communication with the remote source for broadcasting data packets from the remote source to the workstations in that LAN on a remote broadcast channel.
Abstract: A plurality of workstations are sequentially connected to form a chain of workstations in a network having two file servers. The workstations generate data packets for delivery to the file servers. A packet assembly channel receives data packets from the workstations and routes the received data packets through the workstations to a workstation broadcast unit. The workstation broadcast unit broadcasts data packets from the workstations to the file servers via a workstation broadcast channel. Both of the file servers receive data from the workstation broadcast channel and generate data packets for delivery to the workstations. A server broadcast unit is connected to each of the file servers and broadcasts data packets from the file servers to the workstations on separate server broadcast channels.
Abstract: A unique word detecting apparatus comprising a preamble code detecting circuit 202 for detecting a preamble code PR to be transmitted before the unique word UW, a unique word detecting circuit 204 for holding in advance the data of the unique word UW to be detected, an error detecting circuit 203 for comparing the external data with the unique word UW successively bit by bit only when and after the preamble code PR is detected and for outputting an error signal E when not coincide, and a unique word detecting circuit 204 for counting the number of outputs of the error signal E and for outputting a detecting signal DT indicating that the unique word UW has been detected when the count value is equal to or smaller than a predetermined value.