Abstract:
Disclosed are systems and methods for a frontend capture module of a video conferencing application, which can modify an input signal, received from a microphone device to match predetermined signal characteristics, such as voice signal level and expected noise floor. An Input stage, a suppression module and an output stage amplify the voice signal portion of the input signal and suppress the noise signal of input signal to predetermined ranges. The input stage selectively applies gains defined by a gain table, based on signal level of the input signal. The suppression module selectively applies a suppression gain to the input signal based on presence or absence of voice signal in the input signal. The output stage further amplifies the input signal in portions having a voice signal and applies a gain table to maintain a consistent noise floor.
Abstract:
There is provided mitigation of disconnect events in a vectoring based digital subscriber line, DSL, system. A method performed by a digital subscriber line access multiplexer,DSLAM, comprises detecting a loss of signal or disconnect event of a line in a vectored group of DSL lines,the loss of signal or disconnect event causing a negative impact on the DSL system. The method further comprises detecting a change in at least one downstream, DS, crosstalk coefficient of at least one line in said vectored group of DSL lines. The method further comprises determining a magnitude of said change. The method further comprises determining where the loss of signal or disconnect event has occurred by processing precoding coefficients of the vectored group of DSL lines. The method further comprises determining,on basis of the determined magnitude and where the loss of signal or disconnect event has occurred, an action to be performed by the DSLAM so as to mitigate for said negative impact.
Abstract:
L' invention concerne un appareil électronique (1) alimenté par un bloc d'alimentation (10) connecté à un réseau électrique de type secteur, destiné à être connecté à une ligne de transmission (5), (3) comprenant deux éléments conducteurs (6), (7) et à un terminal (9) pour transférer des données entre la ligne (5), (3) et le terminal (9). Selon l'invention, cet appareil comprend: - un composant frontal 20 couplé à la ligne au travers d'un transformateur d'isolement (8); - différents composants additionnels (8), (30), C 1 , C 2 , C 5 reliés à une masse électrique (15) de l'appareil (1); - un composant d'évacuation (11) tel qu'un éclateur à gaz tripolaire, connecté aux éléments conducteurs (6), (7) de la ligne et qui devient passant en cas de surtension due à un foudroiement de la ligne (5), (3), pour annuler cette surtension par établissement d'un courant circulant depuis la ligne vers la masse (15) de manière à protéger les composants situés en aval de cette protection tels que le transformateur (8) ou le composant frontal (20); - un composant diviseur de type capacitif et/ou résistif C 4 interposé entre le composant d'évacuation (11) et la masse électrique (15), pour constituer, avec le bloc d'alimentation et/ou un ou plusieurs des composants additionnels, un pont diviseur grâce auquel la tension imposée à la masse (15) de l'appareil en cas de foudre est inférieure à la surtension subie par les éléments conducteurs (6), (7) de la ligne de manière à protéger également les composants additionnels (8), (30), C 1 , C 2 , C 5 .
Abstract:
A Test Access Matrix (TAM) system permits installation onto an existing connector block. The TAM system exhibits a configuration that permits installation on to telecommunications circuits at the connection point provided for installation of protection modules (1) or other devices (1) that are inserted into the telecommunications circuit. The installation can be accomplished either before new or after existing connector blocks are installed on a telecommunication cross connect frame, tie frame, or other support structure. The TAM system can be instructed to connect a two or four wire test bus to any of the individual telecommunications circuits that are connected to the connector block. The test bus can be connected to the individual communication circuits in either a bridging, break towards the distribution side of the local loop, break towards the telecommunications equipments, or an insertion into the line via a "make before break" sequence.
Abstract:
A method and/or device that may be used in locations where equipotential bonding is not practiced can be installed on a customer premises equipment device basis that provides over-voltage protection between the AC main and HFC ground planes. According to one aspect of the present invention, a bonding link is established between the AC main and the HFC coaxial braid that allows energy surges to bypass the CPE equipment and to be passed on to the AC mains, which are traditionally more equipped to deal with these large energy surges. According to another aspect of the present invention, an apparatus is disclosed that may be incorporated into any premises powered HFC CPE device for protection. The apparatus provides a surge energy bypass path around the CPE device being protected and allow voltage differentials to be normalized between systems.
Abstract:
Verfahren zum Versorgen einer zu versorgenden Schaltungseinheit (201) mit unterschiedlichen Versorgungsspannungen, bei dem die zu versorgende Schaltungseinheit (201) vor Überspannungen geschützt wird, mit den folgenden Schritten: Anlegen mindestens zweier Versorgungsspannung (203a, 203b) bezogen auf ein Massepotential (210) an die zu versorgende Schaltungseinheit (201), Verbinden von Signalanschlüssen (208, 209) der Schaltungseinheit (201) mit Signalleitungen (206, 207) zum Übertragen von Signalen zwischen der Schal-tungseinheit (201) und externen Schaltungseinheiten, Abgeben einer Bezugsspannung (204) von einem Steueranschluss (212) der Schaltungseinheit (201) an eine Überspannungsschutzeinrichtung (205), indem mittels eines Schaltmoduls (211) eine Versorgungsspannung (203a, 203b) zu dem Steueranschluss (212) durchgeschaltet wird, Auslösen der Überspannungsschutzeinrichtung (205) bei Erfassung einer an mindestens einer der beiden Signalleitungen (206, 207) in Bezug auf die Bezugsspannung (204) auftretenden Überspannung.
Abstract:
A method and apparatus are provided for sensing current in a subscriber line (20). The method includes receiving a current signal from a driver (350) capable of driving the current signal on the subscriber line (20), and generating a second signal in response to receiving the current signal, wherein the second signal is proportional to the current signal. The method includes receiving at least a portion of the current signal from a driver (360) capable of sinking the portion of the current signal from the subscriber line (20), and generating a third signal in response to receiving at least the portion of the current signal, wherein the third signal is proportional to the portion of the current signal. The method further includes adding the second signal and the third signal to generate an output signal.
Abstract:
An interference cancellation method for use in a communications system in which a plurality of communication paths are arranged to transmit and receive respective analogue signals comprises effecting an initialisation phase to calculate, for each path, the interference effects of the signals transmitted on that path on the signals received on each of the other paths, and storing for each a plurality of weighting factors representing the interference on each of the other paths respectively. During transmission, said weighting factors are used to generate from the transmitted signal on one of the said paths and to apply said cancellation signals to signals received on said other paths, thereby to cancel the interference effect of said transmitted signals.
Abstract:
An access node of a communication system is configured to control crosstalk between an activating channel associated with a first network terminal of a communication system and active channels associated with respective other network terminals of the system. The access node detects a control signal sent by the first network terminal over the activating channel in a designated phase of an initialization process of the first network terminal, determines an error signal from the detected control signal, correlates the error signal with one or more corresponding signals sent by respective ones of the other network terminals over the active channels, estimates crosstalk from the active channels into the activating channel based on the correlation, and configures a vectoring signal processing module to control the estimated crosstalk. The control signal sent by the first network terminal comprises a value that is selected by the first network terminal from a set of two or more values and prior to its detection the particular selected value is unknown to the access node.
Abstract:
At least one channel is joined to a group of active channels in a communication system by transmitting control signals to configure respective customer premises equipment (CPE) of the active channels into a joining mode of operation, and transmitting a joining signature sequence to CPE of the joining channel over a downstream data signal path of the joining channel. A central office (CO) or other access node of the system receives correlation results from respective active channel CPE, estimates crosstalk from the joining channel into the active channels based on the correlation results, configures a precoder based on the estimated crosstalk, and adds the joining channel to the group of active channels. The channels may comprise respective subscriber lines of a DSL communication system.