Abstract: An embodiment method comprises transmitting a reader carrier signal from a contactless reader to a contactless device, receiving by the reader, a device modulated carrier signal from the device, the device modulated carrier signal having a carrier frequency, preferably turning off by the reader, the transmission of the reader carrier signal during reception of the device modulated carrier signal, and after having turned off the transmission of the reader carrier signal, determining by the reader the presence or the absence at the reader's antenna of a modulated carrier signal having at the reader's antenna the carrier frequency with a tolerance, without relying on the data content of the modulated carrier signal.

Abstract: A method for multicategory classification of streaming data records includes receiving a list of signature rules, each comprising a Boolean expression of a set of atomic recognizers (ARs) of one or more input fields of an input record and an assignment of a signature if the Boolean expression evaluates to TRUE, generating a list of all signature contexts from the list of signature rules, generating a context lookup table for each context, and processing a stream of input records on which signature detection is performed by using said ARs, said list of signature contexts, and said context lookup table for each context, wherein each input record in the stream of input records is classified into one of a plurality of categories based on the signature detection result, wherein an amount of processing grows sublinearly with a number of signature rules being processed.

Abstract: A front end module having reduced number of low noise amplifier (LNAs) for receiving various combinations of contiguous aggregation (CA) signals and non-CA signals having different combinations of signals aggregated therein. The FECC can include a broadband LNA and/or a band-switching LNA having at least two modes of operation. An input switch directs a received signal to one of several banks of filters. LNA switches direct the signals from the output of filters within a selected filter bank to particular LNAs. LNAs may be connected by LNA switches to filters in more than one filter bank. The proper mode of operation is selected for the band switching LNA based on the particular frequencies present in the received signal and the filters selected.

Abstract: Systems and methods for integrated network devices utilizing low-power technologies are disclosed. In some embodiments, a method may include receiving, over one or more pairs of low-voltage wires (e.g., telephone wires, intercom wires, security system wiring, etc.), an electrical current sufficient to power an electronic device disposed within a controlled-environment facility (e.g., a jail, prison, etc.). The method may also include performing an electronic operation within the facility and transmitting, to a communication system serving the facility over the low-voltage wire(s), information related to the operation. In some implementations, the electronic device may be a mobile phone detection apparatus, a wireless access point, and/or a surveillance device. The method may also include, during a first time interval, using the electrical current to store a charge in a battery, and, during a second time interval, using the current in addition to the charge stored in the battery to perform the operation.

Abstract: In connection with a filter circuit, an inductance of a coil is set to Z01/?, a capacitance of a capacitor is set to (a1+1)/(a1·?·Z01), an inductance of a coil is set to a1·Z01/?, and a capacitance of a capacitor is set to (a1+1)/(a12·?·Z01), where ? represents a frequency of an inverter, a1 represents a ratio of an output voltage to an input voltage of the filter circuit, and Z01 represents any design value.

Abstract: An output circuit sends a control pilot signal generated in a voltage generator to an input circuit. A communication unit is connected between an earthed wire and a control pilot wire on the output side of the output circuit via a bandpass filter. A communication unit is connected between the earthed wire and the control pilot wire on the input side of the input circuit via a bandpass filter. A low-pass filter is interposed between the output circuit and the communication unit. A low-pass filter is interposed between the input circuit and the communication unit.

Abstract: Various circuits and methods are disclosed for communications over AC power lines. In one example embodiment, a power line communication circuit includes an analog front end having a data-coupling circuit configured to communicatively couple communication signals to and from a set of AC power lines in the power line communication system. The analog front end also includes a noise reduction circuit that is coupled to the data-coupling circuit. The noise reduction circuit is configured to mitigate noise within a communication frequency band of the communication signals by filtering, from the communication signals, at least one frequency that is located outside of the communication frequency band and that has harmonics located within the communication frequency band and to demodulate data from the communication frequency band of the filtered communication signals.

Abstract: The invention relates to a multimedia and multichannel information system for an interactive distribution of at least one real-time video input of a live event taking place in an auditorium. The system comprises a central unit and a plurality of remote units located in the auditorium. At least one of the plurality of remote units is connected to the central unit by means of a bi-directional transmission network for interactive communications between the remote units and the central unit, the at least one remote unit is provided with at least an interface and with audio/video, data and graphic accelerators disposed on a multimedia microprocessor housed in the remote units. The at least one remote unit is equipped with a touch screen display and is configured to display the at least one real-time video input of the live event taking place in the auditorium.

Abstract: A data reception device in a communication network using a plurality of radio frequency channels. At least two adjacent radio frequency channels are concatenated so as to form a concatenated channel. The device is configured to receive “received” data transmitted in at least one radio frequency channel of the concatenated channel; transpose the received data at an intermediate frequency, thus outputting data at an intermediate frequency; filtering the data at the intermediate frequency with a filter including at least two separate filtering channels, each filtering channel including a band-pass filter, the frequency band of which corresponds to the frequency band of a separate radio frequency channel of the concatenated channel such that the total frequency band of the filters is equal to the frequency band of the concatenated channel; activating at least one of the filtering channels; and recombining data from the filtering channels.

Abstract: Various circuits and methods are disclosed for communications over AC power lines. In one example embodiment, a power line communication circuit includes an analog front end having a data-coupling circuit configured to communicatively couple communication signals to and from a set of AC power lines in the power line communication system. The analog front end also includes a noise reduction circuit that is coupled to the data-coupling circuit. The noise reduction circuit is configured to mitigate noise within a communication frequency band of the communication signals by filtering, from the communication signals, at least one frequency that is located outside of the communication frequency band and that has harmonics located within the communication frequency band. A receiver circuit is coupled to the noise reduction circuit and is configured to demodulate data from the communication frequency band of the filtered communication signals.

Abstract: A subsea data communication system and a method of performing a data communication between a topside control system and a subsea installation are provided. The topside control system includes a topside low frequency modem adapted to perform a data communication in a first frequency range, and the subsea installation includes a subsea low frequency modem adapted to perform a data communication in the first frequency range. The topside low frequency modem is coupled to a subsea low frequency modem by a data transmission line of an umbilical that connects the topside control system to the subsea installation.

Abstract: A method and apparatus is disclosed to restrict the delivery of video, audio, and/or data to unauthorized end users in a satellite communications system. The satellite communications system includes one or more satellite receiving antennas, commonly referred to as a satellite dish, to receive downlink communications signals from one or more satellites. The transmission received by the one or more satellite receiving antennas is converted by an outdoor unit (ODU) for transmission to one or more indoor units (IDUs). The ODU receives control information from one or more satellites from the downlink communications signals, commonly referred to as in-band, and/or from out-of-band communications signals. The ODU may use the control information to restrict access to one or more communications channels embedded within the downlink communications signals to the unauthorized end users.

Abstract: A communication device has a controller operatively connected to at least a first transceiver and a second transceiver, wherein the first transceiver receives signals on one or more channels within a first frequency band and the second transceiver transmits signals on one or more channels within a second frequency band, wherein the first and second frequency bands are adjacent one another so that each of the first and second frequency bands has an adjacent border and a nonadjacent border. Coexistence between the first and second transceivers is achieved by adjusting receive and/or transmit filters associated with the transceivers to create a guard band that is located more in the first frequency band if the second transceiver is using frequencies close to its adjacent border, and a guard band that is more in the second frequency band if the second transceiver is not using frequencies close to its adjacent border.

Abstract: The occurrence of false positives and the post-processing of digital streams subjected to examination by a deterministic finite state machine for character strings are reduced by combining location-based pattern matching, e.g. on packet headers, and content-based pattern matching, e.g. on payloads of packets. One scheme allows automatic transition from a header match state into an initial state of a content matching machine. Another scheme is based on a rules graph defining strings of match states and the examination of a list of match states (rather than characters) which have been previously determined, for example by means of header matching and content matching. The latter is also capable of comparing offset and depth values associated with the match states with offset and depth criteria.

Abstract: The present invention concerns a modem box, a splitting module, and an integrated access device. The modem box comprises upside communication means for coupling with central equipments through central signals, the latter being modulated for at least one of the central equipments, downside communication means coupling the modem box with terminal equipments through terminal signals, transfer means between the upside and downside communication means, and modem means for doing transformation between the modulated central signals and demodulated signals among the terminal signals. The modem box comprises an outer contact surface receiving a splitting module, which does transformation between the central signals and grouped signals formed with a multiplexing of the latter, and the upside communication means comprise at least one connection element arranged with that contact surface, in contact with at least one respective connection element of the splitting module.

Abstract: There is disclosed a system, method, and apparatus for a truck or like vehicle wherein a power source is split and/or divided into a plurality of branch power lines and wherein there is data and power transmitted over the power lines to selected systems and/or subsystems. An intelligent isolation module is provided for selectively transmitting, blocking, and/or altering data and/or power on any branch, sub-branch, and/or selected segment of a branch.

Abstract: The present disclosure provides a system for receiving signals over a power line distribution. Typically, problems of noise and interference are being solved at the receiver side. Systems of the present disclosure, however, are not limited to the receiver-side solution. Systems according to the present disclosure may also be used at the transmitter side. The receiver comprises a high pass filter, a preselect crossover filter, and an analog front-end receiver architecture.

Abstract: Provided are a first filter 63a and a second filter 63b each having a pass band in the range of a frequency band that is obtained by, for example, substantially bisecting a frequency band of f1 to f4. In that case, the regions of the first filter 63a and the second filter 63b partially overlap with each other with the center frequency f5 interposed therebetween. In practice, even if the division is not bisection, a configuration is adopted in which a frequency region of the wider band (the first frequency band 61a) closer to a second frequency band 61b side is covered by the second filter 63b. Accordingly, it is possible to suppress the influence of load fluctuation in a multiband-compatible radio communication device.

Abstract: The occurrence of false positives and the post-processing of digital streams subjected to examination by a deterministic finite state machine for character strings are reduced by combining location-based pattern matching, e.g. on packet headers, and content-based pattern matching, e.g. on payloads of packets. One scheme allows automatic transition from a header match state into an initial state of a content matching machine. Another scheme is based on a rules graph defining strings of match states and the examination of a list of match states (rather than characters) which have been previously determined, for example by means of header matching and content matching. The latter is also capable of comparing offset and depth values associated with the match states with offset and depth criteria.

Abstract: The present invention concerns a modem box, a splitting module, and an integrated access device. The modem box comprises upside communication means for coupling with central equipments through central signals, the latter being modulated for at least one of the central equipments, downside communication means coupling the modem box with terminal equipments through terminal signals, transfer means between the upside and downside communication means, and modem means for doing transformation between the modulated central signals and demodulated signals among the terminal signals. The modem box comprises an outer contact surface receiving a splitting module, which does transformation between the central signals and grouped signals formed with a multiplexing of the latter, and the upside communication means comprise at least one connection element arranged with that contact surface, in contact with at least one respective connection element of the splitting module.

Abstract: A combined line termination arrangement (1) for an access system supporting broadband transmission mode and narrowband transmission mode, the combined line termination arrangement (1) comprising a common interface device (4) having a common port (6) for receiving or transmitting a signal in said transmission modes and being connected to a first line card (2) and second line card (3). The common interface device further comprises a first switching means (10) for selectively closing and/or opening coupling paths to said first and second line cards and at least one bi-directional low pass filter (8) for and one bi-directional high pass filter (9) selective filtering the broadband and the narrowband signals to and from respective line terminations (LT1, LT2).

Abstract: A receiver includes a sample rate converter configured to receive an input data stream having a variable data rate and to output a data stream having a fixed data rate. In some embodiments, the input data stream corresponds to digital video, digital audio and/or metadata, while in other embodiments the input data stream corresponds to any digital data stream that needs to be data rate converted for use by a receiving device. The sample rate converter is configured to track an externally sourced reference time signal corresponding to the input data stream.

Abstract: The present invention discloses a signal processing device and a signal processing method. The signal processing device includes a plurality of receiving devices, a storage module, a weighting module, and a processing module. Each of the receiving devices is capable of receiving an original signal stream, thus the plurality of receiving devices can generate a set of signal streams. The storage module is used for storing a plurality set of signal streams generated by the plurality of receiving devices. The weighting module can generate plurality sets of rotated signal streams according to a reference phase and the plurality sets of signal streams, and further generate a set of weighting signal according to the rotated signal streams. And, the processing module can generate a set of weighting signal streams according to the set of weighting signal and the plurality set of signal streams.

Abstract: A blind adaptive decision feedback equalizer technique relies on two thresholds. The first threshold is applied to the incoming sampled analog data. According to this aspect of the invention, if the signal magnitude exceeds the threshold, then it is considered valid, while if it is below the threshold, it is considered erroneous. This reduces processing, because not every sample generates an error signal. The second threshold is a block threshold that determines when the filter coefficients are updated to account for the incoming data. In accordance with this aspect of the invention, only when a certain number of errors has been accumulated are the coefficients updated. This results in a further reduction in processing.

Abstract: A communication terminal apparatus receives a management signal at a bit rate A and a data signal at a bit rate B (B>A) through the same line, and includes a band limiting unit, a signal regenerating unit, a timing controlling unit, and a data signal obtaining unit. The band limiting unit limits a band. The signal regenerating unit regenerates a signal having the bit rate A or the bit rate B. The timing controlling unit controls timing for obtaining a data signal based on a signal having the bit rate A. The timing controlling unit controls the band limiting unit to limit the band on receipt of the management signal and to lessen band limitation on receipt of the data signal. The data signal obtaining unit obtains the data signal from a signal having the bit rate B according to the timing control.

Abstract: A system and method are provided for framing messages in a data streams encoded with redundant information for transmission and recovering the messages at a receiver. The transmission method accepts an energy waveform representing N words at a first bit rate, encoded with redundant information, where each word includes P number of bits. The N words are transformed, creating N transcoded words, where each transcoded word includes Q number of bits, and where Q<P. The N transcoded words are mapped into M lanes in a buffer memory, where M>1 and each lane receives a frame of N/M transcoded words. A frame alignment marker is generated and mapped into each frame. Each frame is represented as an energy waveform that is transmitted on a corresponding physical lane at the first bit rate divided by M.

Abstract: Method, wireless communication apparatus, and computer program products are provided for adapting at least one transmission setting to be applied by a first transceiver, which is adapted to be operative in a predetermined frequency band, in response to communication by a second transceiver, which is adapted to be operative in the predetermined frequency band. It is determined whether prioritized data traffic is communicated by the second transceiver. If prioritized data traffic is communicated by the second transceiver, the transmission setting is adapted in dependence of the prioritized data traffic.

Abstract: Analog HPNA hub including at least one group of coils, the coils inducing HPNA signals there between, a plurality of filters, each of the filters coupled with a respective one of the coils and further coupled, via respective telephone wiring, with at least a respective HPNA node, wherein each of the filters enables transmission of HPNA data signals there through, and wherein each of the filters prevents transmission of conventional telephony signals there through.

Abstract: A system for transmitting subchannel data over the same media as high speed data, especially DC balanced high speed data. A digital transmitter receives subchannel data and modulates it onto a subchannel carrier as the host signal in the preferred embodiment using frequency shift keying. The FSK subchannel carrier is added by superposition to the high speed data signal. Because of the ability to have very narrow bandwidths for the passbands of digital IF filters, the receiver is more sensitive and less susceptible to the need for tuning to accommodate manufacturing variations in the rise times of the high speed data signals.

Abstract: A feedback module is defined to receive as input a set of data sample signals and a set of reference sample signals. Each of the data and reference sample signals is generated by sampling a differential signal having been transmitted through a FIR filter. The feedback module is defined to operate a respective post cursor counter for each post cursor of the FIR filter and update the post cursor counters based on the received sets of data and reference sample signals. Also, the feedback module is defined to generate a tap weight adjustment signal for a given tap weight of the FIR filter when a magnitude of a post cursor counter corresponding to the given tap weight is greater than or equal to a threshold value. An adaptation module is defined to adapt a reference voltage used to generate the reference sample signals to a condition of the differential signal.

Abstract: The invention concerns a digital processing system fed by at least one filter having three possible states resulting from one or more conditions on one or more protocol attributes, specified for a semantic stream. Each protocol attribute is specified by an ordered sequence of protocol names used in the semantic stream and a parameter name carried by a protocol whereof the name is indicated in the ordered sequence of protocol names. The digital processing device comprises a filtering engine which applies the filter on the communication data until the data provide protocol attribute values wherefrom results a valid or invalid state of the filter and an action motor which triggers the action when the state of the filter is valid.

Abstract: An interface enables an RF signal, a DC power signal, and a data signal to be conveyed between two devices over a single RF cable. In an exemplary application of this invention, a steerable antenna system is coupled to a wireless adapter for use in a wireless network. The steerable antenna includes a plurality of panels that can be selectively activated in response to the data signal, which also determines a direction in which an RF signal is transmitted or received by a selected panel of the antenna. Low pass filters in each device isolate the DC power supply and the load from the other two signals. High pass filters isolate the radio in the wireless adapter and the antenna array from the DC and data signals. The data signal is preferably encoded into a Manchester format that passes through a bandpass filter provided in each device.

Abstract: An outlet (70, 75, 76, 78, 79) for a Local Area Network (LAN), containing an integrated adapter (21, 25) that converts digital data to and from analog video signal. Such an outlet allows using analog video units in a digital data network (80), eliminating the need for a digital video units or external adapter. The outlet may include a hub (31, 41) that allows connecting both an analog video signal via an adapter, as well as retaining the data network connection, which may be accessed by a network jack (73). The invention may also be applied to a telephone line-based data networking system. In such an environment, the data networking circuitry as well as the analog video adapters are integrated into a telephone outlet, providing for regular telephone service, analog video connectivity, and data networking as well. In such a configuration, the outlet would have a standard telephone jack (71), an analog video jack (72) and at least one data networking jack (73).

Abstract: The present disclosure provides a system for receiving signals over a power line distribution. Typically, problems of noise and interference are being solved at the receiver side. Systems of the present disclosure, however, are not limited to the receiver-side solution. Systems according to the present disclosure may also be used at the transmitter side. The receiver comprises a high pass filter, a preselect crossover filter, and an analog front-end receiver architecture.

Abstract: VDSL (Very-high-data-rate Digital Subscriber Line) technology uses at least one downlink frequency band (D1, D2) for conveying information from a data network to a subscriber's transceiver unit. At some sites VDSL technology cannot be used because no standardized uplink frequency band (U1, U2) is usable. The invention solves this problem by using at least one non-VDSL uplink frequency band (N1) for conveying information from the subscriber's transceiver unit to the data network.

Abstract: Certain aspects of changing message filter coefficients dynamically in a packetized network system may comprise selecting a filter for filtering data in a first portion of an incoming data stream. At initiation of a new modification process, a determination may be made as to whether the selected filter is in use and if so, data read by the selected filter may be invalidated or otherwise not utilized for its intended purpose. A selected filter may be marked as being in use prior to being updated, indicating that there is no match for the selected filter. Filter coefficients for the selected filter may be updated while the selected filter is marked as being in use. Upon completion of updating the filter, the selected filter may be marked as not being in use.

Abstract: Methods and systems for per-session NAT learning and firewall filtering are disclosed. Media packets associated with a call/session are received and processed at a media gateway. For the first few received media packets associated with a session, the media gateway uses various unique methods to learn the actual source IP address and UDP port assigned to the remote communication terminal by its customer-premises Network Address Translators (NATs) to the media flows of the current session. After the remote IP and UDP are learned, the media gateway reconfigures its firewall filtering function to check both the dynamically learned remote IP and UDP and the locally assigned IP and UDP of the current session. The per-session NAT learning function removes reachability issues in VoIP deployment, and the per-session firewall filtering function enhances security protection in VoIP deployment.

Abstract: The present invention concerns a modem box a splitting module, and an integrated access device. The modem box comprises upside communication means for coupling with central equipments through central signals, the latter being modulated for at least one of the central equipments, downside communication means coupling the modem box with terminal equipments through terminal signals, transfer means between the upside and downside communication means, and modem means for doing transformation between the modulated central signals and demodulated signals among the terminal signals. The modem box comprises an outer contact surface receiving a splitting module, which does transformation between the central signals and grouped signals formed with a multiplexing of the latter, and the upside communication means comprise at least one connection element arranged with that contact surface, in contact with at least one respective connection element of the splitting module.

Abstract: Discovering routing policies in information networks. Large networks such as Autonomous Systems are abstracted as a single network element. A plurality of taps on the borders of the abstracted element filter ingress/egress data which is forwarded for collection and correlation. By correlating information from different taps, routing policies are discovered. These discovered policies may be compared with published policies. Access control makes discovered policies and the comparisons with published policies selectively available depending on predefined access classes.

Abstract: A network modem which interfaces, in an embodiment of the invention, with existing wired media within a home. The network modems couple to an existing shared medium and utilize frequency division multiplexing to create a communication network thereon. Communication channels are established, discrete from one another in frequency space with each of the active modems coupled to the shared communications medium. Each communication channel carries simplex communications between two or more modems, and all simplex communication channels operate simultaneously to provide a network between all the active modems coupled to the shared communications medium.

Abstract: The invention relates to a line terminating device for a subscriber line which transmits and receives broadband signals via a single subscriber line, a broadband signal being composed of a broadband or narrowband audio-frequency data signal and a broadband higher-frequency data signal and the frequency bands of the voice signal and of the data signal essentially not overlapping. The line terminating device according to the invention has a digital frequency separating filter in the digital section of the line terminating device, which is arranged in the digital section of the line terminating device so that the audio-frequency voice signal is separated from the higher-frequency data signal. In particular, the line terminating device is suitable for separating an ISDN or POTS voice signal from an ADSL data signal.

Abstract: A control program for a co-processor in a video-on-demand system directs the co-processor to perform the steps of: a) obtain a transmission control list, from an external source, which identifies a group of several video data packets and a respective subgroup of internet protocol headers for each video data packet in the group; b) partition into pieces, each video data packet and its respective subgroup of internet protocol headers as identified by the transmission control list; and, c) send the partitioned pieces, along with an additional header for each piece, to an output port during a series of spaced apart time intervals.

Abstract: A system and method of implementing a Fast Fourier Transform (FFT) function in a high data rate communication network. The communication network, employing technology such as VDSL and DMT or FDM, frequently implements a FFT at a transmitter to transfer frequency domain modulated signals into time domain signals. An IFFT is implemented at the receiver to obtain the original signal. The present system divides the channel bandwidth into sub-bands and performs the FFT function with multiple FFTs in order to reduce chip size and computation time.

Abstract: In a multi-format transport stream decoder that performs a desired process on first transport streams of different formats to generate a second transport stream, a process request information input unit (APR) is supplied with process target packet data (Pi) and process request information (ScW) indicative of process details. A stream identification information providing unit (TSRi) provides stream identification information (TSID). A packet data retaining and identifying unit (DBA) retains each pieces of first packet data (Pi), and compares the stream identification information (TSIDe) and packet data identification information (PIDe) of the first packet data (Pi) with the process request information (ScW) to determine whether the information is to be processed.

Abstract: A method and apparatus for filtering data packets in a shared-medium or point-to-multipoint communications network. A filter unit is sent a data packet carrying a filter tag value in a packet addressed to the filter unit. The value is stored in the filter unit and subsequently received packets not addressed to the filter unit itself are forwarded only if they carry the stored filter tag. An embodiment of particular interest applies the method to Ethemet frames over a telecommunications access network (including optical or wireless networks), and uses the VLAN tag field to carry the filter tag information.

Abstract: A technique is disclosed for reducing collisions of signals occurring on at least one communication channel in an access network. The access network may include at least one Head End, and a plurality of network nodes. Each of the network node is configured to transmit signals to the Head End via the communication channel. Filter parameters are included in selected communication request messages transmitted to a first portion of nodes. According to specific embodiments, the filter parameters may be used to limit the number of responses to the communication request messages which are transmitted on the communication channel. In this way, by limiting the number of responses which may be transmitted at specified times over the communication channel, the likelihood of signal collisions occurring on the communication channel may be reduced.

Abstract: A transmission schedule table of program data to be transmitted from a video server to a client is previously transmitted to a filter unit. The filter unit receives program information concerning a currently received program, from the client. Based on a transmission schedule table and program information, the filter unit filters program data multiplexed on the basis of frequency and time, which is transmitted from the video server, while changing its own filtering characteristic. The filter unit transmits the filtered data to the client.

Abstract: A filtering device for a narrow-band terminal in a private installation connected to an access network carrying narrow-band services (analogue or ISDN) and broad-band services (xDSL or HomePNA). The device has a low-pass filter associated with an insulation enabling the device to have a high input impedance insulating the installation when the narrow-band terminal is on hook while allowing the ringing signal to pass. Applicable to private telephone-teledata installations.

Abstract: In one embodiment, a system is provided for processing an input signal communicated on a telephone line, the input signal including a first component associated with a first frequency band, a second component associated with a second frequency band higher than the first frequency band, and a third component associated with a third frequency band higher than the second frequency band. The system includes a first filter to receive the input signal and to pass a first signal substantially comprising the second component, a second filter to receive the input signal and to pass a second signal substantially comprising the first and third components, and a third filter to receive the second signal and to pass a third signal substantially comprising the first component according to an input capacitance of a fourth filter that limits the ability of the third filter to pass the second component.

Abstract: A filtering device (50) for active filtering at a customer premises includes an input interface that receives telephone signals and digital data signals communicated from a central office (14) using a telephone line (12). The filtering device (50) further includes an active low-pass filter (60) that receives the telephone signals, the digital data signals, and electrical power from a power source. The active low-pass filter (60) attenuates the digital data signals and passes the telephone signals using the electrical power. The filtering device (50) also includes an output interface that receives the telephone signals from the active low-pass filter (60) and communicates the telephone signals to a telephone (42).

Abstract: A wheelchair back system provides height adjustability of the back, adjustment of the tilt and a lumbar support for a user. The back system is removably-affixed to vertical wheelchair posts by pairs of upper and lower channels at the lateral edges of the back. One of the channels on each side is open to the rear and the other of said channels is open to the front, whereby the channels engage the wheelchair posts. A clip, affixed to the rear side of the wheelchair posts, releasably engages the front opening channels to secure the back in engagement with the wheelchair post.