Abstract: A user through a personal computer, in real time, controls the activation and selection of voice and data transmission paths in a communication network independent of network profiles. The network includes a public switched telephone network and a data network, e.g. the Internet for voice and/or data transmissions over either the voice or data networks. In the network, a voice terminal and a computer terminal are coupled to a shared voice and data terminal. A digital subscriber line access multiplexer is coupled to the shared voice and data terminal; the data network through a client server interface, and a voice network through an intelligent switch. The client server interface includes programmable stored data descriptive of network-authorized data and voice functions and transmission paths in the voice and data networks. The interface is linked to the multiplexer and switch for transmitting signaling messages directing traffic to the voice and data networks in accordance with the stored data.

Abstract: A timing technique for a Quantization-Level-Sampling (QLS) modem puts timing information in a downstream pulsed signal transmitted from the public switched telephone network (PSTN) to the QLS modem. In response to this timing information, the QLS modem synchronizes to the network sampling clock in the PSTN. In particular, the pulsed signal includes data-bearing samples, which were provided by a far-end QLS modem, and at least one non-user-data-bearing (NUDB) sample in which the level of this NUDB sample periodically alternates. The QLS modem extracts timing information from this periodic alternating signal level to synchronize the QLS modem to the network sampling clock.

Abstract: A field apparatus which allows for migration from an analog signal transmission system to a field bus transmission system without a need to change the configuration of the field apparatus and performs a self diagnosis. The field apparatus includes a receiving unit which receives a field bus oriented signal from another apparatus connected to the transmission line, an analog signal transmitting unit which transmits a measured magnitude of a measurement object through the transmission line as an analog signal, a field bus signal transmitting unit which transmits a measured magnitude of a measurement object through the transmission line as a field bus oriented signal, and a switch which selects either the analog signal transmitting unit or the field bus signal transmitting unit which transmits an analog signal or a field bus oriented signal respectively through the transmission line.

Abstract: In a transmission system for transmitting synchronous data portions and asynchronous data portions, a transmission frame includes regularly spaced synchronous data portions interleaved with asynchronous data portions. To insure that the packing density of asynchronous data portions is optimal, the position of the synchronous data portions is allowed to deviate from its nominal value to increase the packing rate of the asynchronous data portions.

Abstract: A telephone and video telecommunications distribution network (10) includes a telecommunications switch (12) and an optical network unit configuration (20b). The telecommunications switch (12) receives telephony traffic at a common control section (14) and video information at a video bank section (18). The video bank section receives telephony traffic from the common control section (14) and places the telephony traffic into telephony ATM cells. Video information is carried in video ATM cells. The Video Dank section (18) multiplexes telephony ATM cells and video ATM cells onto a fiber optic communication link for transport to the optical network unit configuration (20b). The optical network unit configuration (20b) includes a full service optical line unit (80) that segregates telephony ATM cells from video ATM cells. The full service optical line unit (80) transfers video ATM cells to a video brick (31) for processing.

Abstract: The invention relates to a data transmission method in a wireless data transmission system where signals with one or more data rates and quality levels are transmitted simultaneously. In order for it to be possible to transmit information on the radio path at different rates and quality requirements, the transmitter according to the invention comprises forward error correction coders (206, 208) for carrying out outer coding for at least some of the signals to be transmitted so that all the signals to be transmitted have a common quality level, a multiplexer (214) for combining the signals to be transmitted into frames having a given length, a forward error correction coder (220) for carrying out inner coding for the frames to be transmitted, and a mechanism (222) for repeating or deleting symbols in each frame, if necessary, so that the length of the symbols or each frame equals that of a multifold of a time interval that is known and essentially shorter than the symbol length.

Abstract: A method and system are provided for the transmission and reception of an In-band On-channel (IBOC) FM-band digital audio broadcast (DAB) signal. The IBOC DAB signal is generated in the transmitter to substantially occupy the upper and lower sideband frequency regions in the RF emission mask for the conventional broadcast analog FM-band. Redundant source bit information is transmitted in both the upper and lower sidebands so that the loss of information in either one but not both sidebands due to large amounts of interference or distortion, caused by, for example, first-adjacent interference, does not deleteriously affect the IBOC DAB receiver performance. The system exhibits both frequency-diversity and time-diversity. The receiver determines which codeword bit estimate, corresponding to either upper or lower sideband signals, is less likely to be erroneous.

Abstract: An auxiliary data signal is transported with a primary data signal by hiding the auxiliary data signal in the form of colored noise. The colored noise has a spectrum that simulates the spectrum of the primary data signal. By adjusting the gain of individual spread spectrum signal carrier(s) and the power of the colored noise, the auxiliary information stream(s) can be rendered at any desired level below or above an interference threshold in the primary data signal. The power of the colored noise is further compensated to account for a cross-correlation between the primary data signal and the auxiliary data signal to enhance the recovery of the auxiliary data at a decoder.

Abstract: Auxiliary data is transported in a primary data signal by hiding the data in the form of colored noise. The colored noise has a spectrum that simulates the spectrum of the primary data signal. The data to be transported is first converted to a spread spectrum signal. The primary data signal is analyzed to determine its spectral shape. The same spectral shape is imparted to the spread spectrum signal, which is then combined with the primary data signal for transmission. The spectral shaping can be performed using time domain modeling and synthesis such as linear predictive coding or by using subband coding techniques such as fast Fourier transforms. A plurality of different auxiliary information streams can be transported on the primary data signal. By adjusting the gain of individual spread spectrum signal carrier(s) and the power of the colored noise, the auxiliary information stream(s) can be rendered at a desired level at, below or above an interference threshold in the primary data signal.

Abstract: Data to be transmitted is converted into symbols using a plurality of data-to-symbol conversion processes. The symbols from these processes are then time-division multiplexed. Advantageously, at least one of these conversion processes incorporate coding in a manner which provides the same degree of error protection for each process. In the disclosed embodiments, the data originates from two independent sources and the data from each source is converted into symbols using a different data-to-symbol conversion process.

Abstract: A compound transmission system compounds signals from a LAN communication device and other communication devices without multiplex them. A first LAN communication device is connected to a second LAN communication device through two line pairs (10, 20). A first signal transmission device such as an exchanger (111) is connected to center taps of windings of transformers (50, 51) on the side of the line pairs to superpose a communication signal from the first signal transmission device on the LAN signal and separate a telephone communication signal from the LAN signal at the center taps. The transformers (50, 51) constitute a first superpose/separate circuit. A second signal transmission device such as an exchanger terminal (112) is connected to center taps of windings of transformers (60, 61) on the side of the line pairs to superpose a communication signal from the second signal transmission device on the LAN signal and separate the communication signal from the LAN signal at the center taps.

Abstract: The present invention allows for the simultaneous transmission of two digital signals from one integrated circuit to another. The two digital signals are encoded utilizing a voltage divider circuit and are then transmitted by one transmission line to the second integrated circuit chip. The second integrated circuit chip decodes the first digital signal and then utilizes this decoded digital signal to further decode the second digital signal.

Abstract: A method and an apparatus are disclosed for combining information from two sources and for separating the combined information after transmission over one physical channel. A mask which represents a specified piece of information such as a control command or logic state of an input is exclusively ORed with an encoded input signal, thereby inducing a violation of an error control code. At the receiving end of the system, each of a set of masks is exclusively ORed with the received data stream. One of the masks is the same as the mask initially combined with the encoded input signal. Accordingly, once that mask is combined with the received data stream and so indicated by the favorable outcome of an error control code check, the original encoded input as well as the specified piece of information are recreated and produced.

Abstract: In digital data packets comprising a first datum from which a second datum can be unequivocally computed, e.g. an error correction value, one or a plurality of additional data can be introduced by manipulating said second datum without altering the structure of the data packet. For this purpose, one or a plurality of bits of the second datum are modified in an unequivocally reversible manner, e.g. inverted, according to the additional datum which is also digital. The recuperation of the additional data is effected by comparing comparative values which are obtained by reversing all possible combinations of additional data in a received data packet to a value which is computed from the first datum of the data packet: The presence of the corresponding combination of additional data results from the consistency of the latter with one of said comparative values. Another possibility is to limit the inquiry to a fraction of the possible combination.

Abstract: Methods and apparatus for detecting the presence of a particular signal among all the channels of interest in a cellular or similar type system are disclosed. A first method detects CDPD signals, and a second method detects DQPSK signals used in digital control channels in accordance with the IS-136 standard. These methods include the steps of sampling a received signal in at least one channel to obtain a predetermined number of samples for the at least one channel; computing an error value for each sample; determining a minimum error value; determining a ratio of the minimum error value to a reference value; and making a decision as to whether the received signal is the prescribed signal on the basis of at least the ratio, wherein the decision is made by comparing the ratio to a threshold value.

Abstract: In a wide band radio frequency (RF) simulcast communications system analog voice signals are distributed in a digitized form over high speed data channels and processed as high speed data. A conventional Ericsson, Inc. EDACS.TM. simulcast communications system is improved by altering the apparatus and manner by which "clear voice" (unencrypted analog voice) is distributed from a control point and "aligned" at multiple transmitter sites for simultaneous RF broadcasting. In the improved arrangement, the EDACS.TM. simulcast system inherent digital data stream alignment process produces the requisite time domain alignment for the digitized "clear voice" signals without the need for costly analog audio alignment procedures and equipment.

Abstract: A network topology allowing distributed sensing, control and communication, comprising a power source and a plurality of line-Powered, Serially connected Intelligent Cells (PSICs) coupled to the power source and to each other via respective communication channels comprising at least two electrical conductors. Each of the PSICs is uniquely addressed, preferably "on the fly" in real time, and at least one payload element is coupled to one of the PSICs for operating in accordance with control logic embedded in or fed to the corresponding PSIC. The communication channels allow for data transfer between adjacent PSICs in either or both directions independent of a simultaneous communication between another pair of adjacent PSICs.

Abstract: A timing technique for a Quantization-Level-Sampling (QLS) modem puts timing information in a downstream pulsed signal transmitted from the public switched telephone network (PSTN) to the QLS modem. In response to this timing information, the QLS modem synchronizes to the network sampling clock in the PSTN. In particular, the pulsed signal includes data-bearing samples, which were provided by a far-end QLS modem, and at least one non-user-data-bearing (NUDB) sample in which the level of this NUDB sample periodically alternates. The QLS modem extracts timing information from this periodic alternating signal level to synchronize the QLS modem to the network sampling clock.

Abstract: Auxiliary data is transported in a conventional audio signal by hiding the data in the form of colored noise. The colored noise has a spectrum that simulates the spectrum of the primary audio signal. The data to be transported is first converted to a spread spectrum signal. The primary audio signal is analyzed to determine its spectral shape. The same spectral shape is imparted to the spread spectrum signal, which is then combined with the primary audio signal for transmission. The spectral shaping can be performed using time domain modeling and synthesis such as linear predictive coding or by using subband coding techniques such as fast Fourier transforms. A plurality of different auxiliary information streams can be transported on the audio signal. By adjusting the gain of individual spread spectrum signal carrier(s) and the power of the colored noise, the auxiliary information stream(s) can be rendered inaudible in the primary audio signal, or at any desired level below or above an audible threshold.

Abstract: In a packet network, message packets (130) are comprised of vacant or unused bits for future system enhancements or for remedying unknown design oversights or utilizing vacant portions of fixed length data packets. Furthermore, message packets (130) comprise a message type identifier distinguishing message architecture. A transmit and receive packet network node (100) maintains an unused bit catalog (125) listing vacant or unused bits of particular message packet types. When a message packet type having vacant or unused bits is detected propagating through the packet network, background data is retrieved from a transmit background data queue (115) and interleaved into such message packets to form enriched message packets (130') for transportation through the packet network. Receiving packet network nodes (100) detect enriched message packets (130') and extract and buffer the background data.

Abstract: A collective-house control system is provided which employs an interface circuit for alternative mark inversion (AMI) communication. The interface circuit has a data detecting unit, a controlling unit, and an AMI signal generating unit. The data detecting unit receives input AMI signals from a single coaxial line and detects first control data within the input AMI signal. The controlling unit receives the first control data and generates a corresponding output signal. Also, controlling unit inputs second control data and generates first and second signals for generating an output AMI signal. The AMI signal generating unit inputs the first and second signals and generates the output AMI signal in accordance with such signals. The interface circuit may also include a collision detecting unit and a logic circuit unit.

Abstract: A CPU enables an FM tuner, a tuning controller and an FM multiplex decoder, after which the CPU is disabled. The FM tuner, tuning controller and FM multiplex decoder receives frame data including emergency information transmitted from a broadcasting station. When a packet coincidence circuit determines that the received block is a specific block which may include emergency information, the FM multiplex decoder causes an emergency information determining circuit to determine if the associated packet contains emergency information. If this packet contains emergency information, the emergency information determining circuit sends an interrupt signal to the CPU to enable the CPU. The CPU then reproduces the emergency information in the received data and displays it on a display section.

Abstract: Digitally-compressed audio and image data of a plurality of programs (logical channels) are distributed and superimposed for every horizontal synchronizing signal period together with identification information of each of the programs in place of a luminance signal of an analog video signal of each of physical channels. Each of the physical channels is superimposed in its frequency and distributed from a signal transmission facility of a broadcasting station. At the receiving side, a desired physical analog channel is tuned and the compressed digital audio and image data superimposed on the tuned video signal are selected and taken as desired logical channel data in reference to program identification information, and the compressed digital audio and image data are decoded to obtain their original audio and moving images.