Abstract: An appatatus for enhancing transport packet demultiplexing and distribution in a digital transport demultiplexing system that inputs a stream of digital multimedia transport packets is provided. The demultiplexing apparatus performs the demultiplexing operation by transferring data packets into and out of circular data queues. These circular queues comprise a contiguous block of memory which are defined by a queue starting address, a queue size, a read pointer, and a write pointer. When data packets are written to and read from a circular queue, the sequential addressing of the queue will automatically rollover from the highest memory location within the queue to the lowest memory location when the sequential addresses move through the circular queue. The addressing of the various queues and sharing of a transport stream bus is handled by a memory arbiter and queue manager.

Abstract: An interface apparatus includes first and second devices, each having a series of ports for connection to a common packet transfer bus associated with a controller. The devices operate in parallel and are configured so that when one is in an active mode the other is in a warm stand-by mode ready to become active in the event of failure of the active device. The ports of the device in the active mode communicate normally with the controller to initiate transfer of the packets over the packet transfer bus. The ports of the device in the standby mode are inoperative to communicate with the controller to initiate packet transfer, but otherwise operate normally so as to be ready for immediate activation in the event of failure of the device in the active mode.

Abstract: A transmitting apparatus is provided with a transmit buffer for each of N-number of services for which the length of encoding time is ni·T (i=1, 2, . . . , N). The transmit buffer has a first storage unit for storing a length ni·T (i=1, 2, . . . , N) of transmit data, and a second storage unit for storing a reference time length T of transmit data. The following operation is carried out on a per-service basis: a length ni·T of transmit data is stored in the transmit buffer in the lengths T at low speed; a length ni·T of transmit data, which has already been stored in the transmit buffer, is read out in burst fashion at high speed in parallel with storage of a succeeding length T of transmit data in the transmit buffer; and storage and read-out of ni·T lengths of transmit data are subsequently performed in parallel in similar fashion and the transmit data that has been read out is input to an encoding processor.

Abstract: A transport stream (TS) demultiplexer has a TS input switch unit and an output switch unit, whereby inputs and outputs can be selected as desired, external output can be easily changed by changing selected information of the TS input switch unit and the output switch unit, without changing inputs. Therefore, the TS demultiplexer receives a plurality of TSs such as MPEG-2 TSs and DSS TSs, and can selectively demultiplex the TSs, and particularly, the TS demultiplexer can store the TSs in a storage medium such as a hard disc drive, or it can easily transmit the TS data over an IEEE1394 bus or a PCI bus.

Abstract: A demultiplexer is provided capable of handing different types of the multiplexing format and minimizing the overall size and the cost of its circuitry arrangement.

Abstract: A method of and system for conferencing a plurality of clients over a local or wide area network using multicasting where the conferencing function is distributed between a server and the clients. The invention takes advantage of certain capabilities of existing client equipment and multicasting capabilities of the server to distribute the conference function between the server and the clients in a conference call over a LAN/WAN in a way that reduces network congestion and protocol complexity. The system of the present invention for providing conferencing over a local or wide area network, includes: a plurality of clients connected to the network for transmitting signals to and receiving signals from the network; and a server connected to the network for receiving a plurality of signals transmitted from the plurality of clients, mixing the received signals to create a single multicast signal, and transmitting the multicast signal to each of the clients.

Abstract: Data bits—in each case one bit multiplet with a predetermined number of bits per channel—are transmitted in accordance with a particular time sequence in time-division multiplex frames. According to a predetermined allocation of the channels to groups including in each case a predetermined subset of the channels, the multiplets of in each case one group are transmitted time-interleaved with respect to one another in the time-division multiplex frames. The various groups, however, are in each case transmitted successively in the frames.

Abstract: An apparatus and method for enabling the combination of multiple streams of data cells into a single thread. By enabling plural input ports of an intermediate device to access a single parallel output port of the device, plural network switch elements share a single thread through a switch fabric. For instance, the method and apparatus permit interleaving the relatively low bandwidth cell outputs of two ATM network switch central control processors onto a single thread routed through an interconnected switch fabric. Certain of these cells are received from the switch fabric at a parallel input of the intermediate device, then routed to one of plural serial output ports. Pacing of cells provided to the plural serial input ports prevents exceeding the shared thread bandwidth.

Abstract: A digital carrier telephony system for delivering voice and data telephony services to subscribers in rural locations having low population densities. A Central Office processes telephony signals having subscriber channels. A Terminal (COT), which is connected to the CO and to one end of a digital carrier line, can transmit outgoing digital carrier line signals on the digital carrier line in response to multiplexing the subscriber channels of telephony signals received on a wired link from the CO. The COT also can transmit telephony signals to the CO in response to demultiplexing subscriber channels of incoming digital carrier line signals received on the digital carrier line. At subscriber locations, multiple remote drop units are typically connected to the digital carrier line. The remote drop unit can insert one of the subscriber channels into the multiplexed subscriber channels of one of the incoming digital carrier line signals.

Abstract: A method and system are provided for remultiplexing program bearing data. The remultiplexing method and system are applicable to MPEG-2 compliant transport streams carrying video programs. A descriptor based system is used for scheduling the timely output of transport packets wherein each descriptor records a dispatch time as well as a receipt time for each transport packet. The receipt time is used for estimating program clock reference adjustments, but final program clock reference adjustment is performed in hardware in relation to the precise output timing of each transport packets. A descriptor and transport packet caching technique is used for decoupling the synchronous receipt and transmission of transport packets from any asynchronous processing performed thereon. The descriptors can also be used for managing scrambling and descrambling control words (encryption and decryption keys). Remultiplexing functions may be distributed across a network.

Abstract: A method and apparatus is provided for creating a composite waveform. This composite waveform is created by coding a plurality of input digital information signals. Subsequently, the plurality of coded input digital information signals are communicated over a communication medium to a digital combiner. The digital combiner combines the plurality of coded input digital information signals. Finally, the digitally combined information signal is spectrally shaped to form a composite waveform. These composite waveform creation principals may be applied to digitally encoded voice subbands in a subband coding system as well as channel information in a direct sequence code division multiple access (DS-CDMA) communication system transmitter.

Abstract: A system and method for sending multiple data signals over a serial link comprises an embedding unit and a removing unit coupled by a serial line. The embedding unit preferably receives a plurality of data streams, encodes the data streams and then merges the encoded data into a serial stream that is output across a serial line to the removing unit. The removing unit receives a serial stream of data, decodes the serial stream, and then separates the decoded serial stream into separate streams thereby reconstructing the streams input to the embedding unit. The encoding and transmission by the embedding unit and the receipt and decoding by the removing unit are completely transparent, the signals output by the removing unit are identical in timing and data content to the signals input to the embedding unit. The present invention also includes a method for transmitting a plurality of data streams over a signal line, and a method for generating a plurality of data streams from a serial sequence.

Abstract: A computer video signal distributor receives as inputs the video signals of a computer, and then processes and distributes these video signals to a plurality of monitors. The computer video signal distributor includes three transistor common based voltage amplifying circuits for inputting red, green, blue video signals of the computer respectively, then amplifying these video signals for outputting. Three sets of transistor emitter follower current amplifying circuits are provided for connecting respectively with one of the outputs of the three voltage amplifying circuits, and provide sufficient frequency response for inputted video signals, and distributing the inputted video signals according to the number of monitors. A synchronous signal buffering device is provided for receiving synchronous signals of the computer, and generating a plurality of sets of synchronous signals according to the number of the monitors.

Abstract: A method and system are provided for remultiplexing program bearing data. The remultiplexing method and system are applicable to MPEG-2 compliant transport streams carrying video programs. A descriptor based system is used for scheduling the timely output of transport packets wherein each descriptor records a dispatch time as well as a receipt time for each transport packet. The receipt time is used for estimating program clock reference adjustments, but final program clock reference adjustment is performed in hardware in relation to the precise output timing of each transport packets. A descriptor and transport packet caching technique is used for decoupling the synchronous receipt and transmission of transport packets from any asynchronous processing performed thereon. The descriptors can also be used for managing scrambling and descrambling control words (encryption and decryption keys). Remultiplexing functions may be distributed across a network.

Abstract: In a digital tuner, a tuner subunit selects a data stream of one or more programs from a data stream in which digital signals of a plurality of programs are multiplexed, and a 1394 interface transmits the selected data stream to an 1394 serial bus. A logical output plug is set in the tuner subunit, and the data stream of the one or more programs is output to the 1394 interface from the output plug.

Abstract: The invention has the object of offering a channel-selection-type demultiplexing circuit which is capable of interchanging the time slots of demultiplexed signals when demultiplexing ultra-high-speed multi-channel multiplexed signal stream without expanding the scale of the circuits, and does not require the scale of the circuits to be expanded even if the speed of the transmission path increases. The invention is a channel-selection-type demultiplexing circuit capable of demultiplexing signals to a desired output port during bit demultiplexing, instead of simply demultiplexing the bits as in conventional devices, which performs bit demultiplexing based on a frequency division clock after selecting the bit signals to be demultiplexed to the desired output port from the N-channel multiplexed signal stream based on channel selection information.

Abstract: A data transmission system, in which data streams shall be transmitted with great speed between a sending clock domain and a receiving clock domain, which operate with mutually different clock speeds, includes two system part circuits. One of these system part circuits is designed to receive from the first clock domain a data stream with the clock speed of the first clock domain and, controlled by this clock speed, serial/parallel convert the data stream to parallel data streams, each with a clock speed that is a certain fraction of the clock speed of the first clock domain. The other system part circuit is designed to receive the parallel data streams and, controlled by the clock speed of the other clock domain, parallel/serial convert them to an output data stream, which with the clock speed of the second clock domain is sent to the second clock domain.

Abstract: A plurality of voice-over-ATM modules operate in parallel and each processes at least one type of AAL. Interface circuitry and contention circuitry allow the parallel modules to interact. The result is an interworking between ATM streams and different types of equipment.

Abstract: In a code division multiple access communication system providing a plurality of communication type services between a first unit (100) and a second communicating unit (200) by time-multiplexing a plurality of data channel signals (101, 102, 103) associated with the plurality of communication type services to produce a time-multiplexed data channel signal (106) which are combined to produce a combined signal (136). Combined signal (136) is transmitted from first unit (100) to be received by second unit (200). After producing a code-demultiplexed time-multiplexed data channel signal (218), and a plurality of signal-to-interference ratios estimated based on a plurality of time-multiplexed portions of signal (218), a plurality of power control thresholds corresponding to the plurality of communication type services are compared to the plurality of signal-to-interference ratios. As a result, producing a plurality of power control data bits corresponding to the plurality of communication type services based.

Abstract: In a data multiplexing/demultiplexing apparatus including a serial-to-parallel converter, a microprocessor and a memory, a data shift register inputs data from the memory by way of the microprocessor, a correction register stores a shift correction amount on a transmission path of the data shift register. A framing rule register stores a framing rule determined by the microprocessor, a counter, carries out a counting operation in accordance with the framing rule to an address information signal. A look-up table ROM outputs a selector selection signal in accordance with the address information signal, and a data selector distributes output data of the data shift register among a plurality of shift registers in accordance with the selector selection signal. The microprocessor analyzes data separated by the plurality of shift registers, performs a synchronism detecting operation and a protocol determining operation, and determines the framing rule.

Abstract: A system and method for broadcasting an audio signal in a turbo-coded satellite digital audio broadcasting system is provided that utilizes the combination of a turbo coding system having code combining and code diversity techniques to lower the power required for transmittal and to transmit at a higher code rate of 1/4 by utilizing the puncturing sequence and a pilot signal assisted orthogonal CDMA; the invention includes an improved receiver system that uses modified RAKE receivers in order to mitigate the Rayleigh multipath fading, shadowing, and temporal blockage and improve performance. The invention further uses a terrestrial gap filler network having a reduced amount of gap fillers.

Abstract: Apparatus for linking multiple baseband telephone lines to provide broadband communication. The apparatus comprises a broadband port, a plurality of baseband ports, and a controller. The broadband port provides connection to a broadband device or broadband communication line. The baseband ports provide connection to baseband communication lines. The controller integrates baseband data streams accepted at the baseband ports into a broadband data stream for transmission at the broadband port, and/or demultiplexes a broadband data stream received at the broadband port into baseband streams for transmission at the baseband ports. The baseband data include message data corresponding to the message data of the broadband stream, and control data describing an interrelationship among the message data, for controlling integrating of said baseband message data. The telephone numbers of baseband communication lines for use by the controller are automatically determined.

Abstract: A mobile work-in-process parts tracking system includes a vehicle for transporting the work-in-process parts stored in containers, a tag mounted on the container and a tag reader mounted on the vehicle for reading the tag and outputting data to a data concentrator which accepts data from a plurality of tag readers and then outputting data in a single cable by removably connecting to a data distributor mounted in the factory floor, such that the location of the WIP parts transported on the vehicle can be tracked and monitored.

Abstract: A multi-rate transmission system (10) includes a receive section (12) and a transmit section (14). The receive section includes a receiver (16), a clock recovery unit (18), and a serial to parallel converter (20) all operating at a first clock rate (M). The receiver (16) also has a frame recovery unit (22) that operates at any of a plurality of clock rates, including the first clock rate (M) and a second clock rate (M/n). When the frame recovery unit operates at the first clock rate (M), frame information received by the receiver section (12) has unique bits occupying each bit position associated with each clock pulse of the first clock rate (M). When the frame recovery unit (22) operates at the second clock rate (M/n), each unique bit of the frame information occupies a number of bit positions according to a ratio of the first clock rate (M) to the second clock rate (M/n). Similar operation occurs with respect to a frame formatter (30) in the transmit section (14) of the multi-rate transmission system (10).

Abstract: A system and method for sending multiple data signals over a serial link comprises an embedding unit and a removing unit coupled by a serial line. The embedding unit preferably receives a plurality of data streams, encodes the data streams and then merges the encoded data into a serial stream that is output across a serial line to the removing unit. The removing unit receives a serial stream of data, decodes the serial stream, and then separates the decoded serial stream into separate streams thereby reconstructing the streams input to the embedding unit. The encoding and transmission by the embedding unit and the receipt and decoding by the removing unit are completely transparent, the signals output by the removing unit are identical in timing and data content to the signals input to the embedding unit. The present invention also includes a method for transmitting a plurality of data streams over a signal line, and a method for generating a plurality of data streams from a serial sequence.

Abstract: The present invention discloses a distributed data transfer system for transferring data among several processing units and an integrated data storage means, e.g., a memory sub-system. The distributed data transfer system includes a plurality of distributed data transfer means for connecting to the processing units. The distributed data transfer system further includes a distribution control means connected to the distributed data transfer means and the integrated data storage means. The distributed data transfer means, under the control of the distribution control means, is capable of transferring the data in divisible portions over a plurality of scheduled time periods. In a preferred embodiment, the distributed data transfer means further includes a plurality of data bus branches and a bus trunk connecting to the data bus branches. The distribution control means further includes a programmable control means for down-loading of control programs for controlling the distributed data transfers.

Abstract: A device for transmitting and decoding audio-visual streams arranged in accordance with standard ISO/IEC 11172 is provided. The device (DEC) comprises: interfaces (CSC, IA, CIS) for connection to a local storage device (MEL) or to a telecommunications network (2, 3), for receiving streams from remote sources or send streams to remote receivers; demultiplexing and synchronisation means (DES) for splitting the audio-visual streams into constituent audio, video and private data streams and extracting synchronisation information from the streams, and means (DA, DV, UA, UV) for decoding audio and video streams and present audio and video signals in analog form at the output. A controller (CNT) is to control and supervise demultiplexing and decoding operations.

Abstract: The method allows performing the multiplexing of audio-visual streams, coded according to standard MPEG1, to be sent to remote equipment where demultiplexing and decoding occur. The method takes into account the trend of the occupancy of the input buffers of the remote decoders in order to avoid possible underflow or overflow conditions. For this purpose a multiplexed stream is constructed, composed of packets of variable sizes, by choosing the streams on the basis of the urgency to receive data that the demultiplexing buffers BDi have in order not to become empty.