Abstract: In a method for detecting leakage in a digital cable system, at least one first signal is inserted on the cable system. The at least one first signal has an amplitude multiple tens of dB below the digital channel power of the digital channels carried on the cable system. A second signal containing the first signal is received. The second signal is converted to an intermediate frequency (IF) signal. The IF signal is digitized and samples of the digitized IF signal are obtained. Digitized samples of a third signal at the nominal frequency of the first signal at maximum amplitude converted to the IF are provided. The digitized IF signal and the digitized samples of a third signal at the nominal frequency of the first signal at maximum amplitude converted to the IF are correlated. The presence of the inserted first signal is detected based upon the result of the correlation. In another method, a pair of first signals are inserted on the cable system.

Abstract: Various methods of detecting leakage of a signal from a Data-Over-Cable Service Interface Specification (DOCSIS) 3.1 channel are disclosed, including using a DOCSIS 3.1-defined “exclusion band” to insert existing tagger-based test carriers, using a power signature algorithm to detect the presence of DOCSIS 3.1-defined pilot carriers, and using a time-based correlation technique to detect the presence of DOCSIS 3.1-defined cyclic prefixes.

Abstract: A method for determining the magnitude of leakage in a subscriber's premises CATV installation; a frequency multiplexer for coupling between an antenna and a receiver for the multiplexed frequencies; and, a method for a technician to certify a CATV subscriber's premises for the provision of CATV services are disclosed.

Abstract: In a communication network, a node at a subscriber premises includes an input/output (I/O) port, and a device for monitoring a subscriber premises. The device includes an upstream signal path including a first switch, a downstream signal path, and a controller having an input/output (I/O) port coupled to the I/O port of the node, and a first output port. The first switch is coupled to the first output port selectively to complete the upstream signal path.

Abstract: In a method for detecting leakage in a digital cable system, at least one first signal is inserted on the cable system. The at least one first signal has an amplitude multiple tens of dB below the digital channel power of the digital channels carried on the cable system. A second signal containing the first signal is received. The second signal is converted to an intermediate frequency (IF) signal. The IF signal is digitized and samples of the digitized IF signal are obtained. Digitized samples of a third signal at the nominal frequency of the first signal at maximum amplitude converted to the IF are provided. The digitized IF signal and the digitized samples of a third signal at the nominal frequency of the first signal at maximum amplitude converted to the IF are correlated. The presence of the inserted first signal is detected based upon the result of the correlation. In another method, a pair of first signals are inserted on the cable system.

Abstract: A method and apparatus for detecting leakage of a digital CATV channel signal from a CATV system. The digital CATV channel signal is amplitude modulated with a tag signal having a frequency in the range of about 3 Hz to about 35 Hz, and coupled to the CATV system. At a point of leakage from the CATV system, the amplitude modulated digital CATV channel signal can be detected using a leakage detector capable of recovering the tag signal.

Abstract: “Cradle-to-grave” treatment of leaks begins with technicians logging leakage signal strengths and GPS latitude and longitude coordinates in technicians' vehicles as the technicians go about their daily assignments. Leakage signal strengths and GPS latitude and longitude coordinates are then uploaded to a leakage server. The server calculates leak latitude and longitude coordinates and signal strengths. The system sends the leakage signal strengths and/or calculated leak latitude and longitude coordinates to technicians' vehicles, for example, as components of, or attachments to, work orders. The latitudes and longitudes are converted by GPS navigators in the technicians' vehicles to turn-by-turn directions to the calculated leak locations. The technicians drive to the leaks, identify and repair them, and close the work orders.

Abstract: In a method for detecting leakage in a digital cable system, at least one first signal is inserted on the cable system. The at least one first signal has an amplitude multiple tens of dB below the digital channel power of the digital channels carried on the cable system. A second signal containing the first signal is received. The second signal is converted to an intermediate frequency (IF) signal. The IF signal is digitized and samples of the digitized IF signal are obtained. Digitized samples of a third signal at the nominal frequency of the first signal at maximum amplitude converted to the IF are provided. The digitized IF signal and the digitized samples of a third signal at the nominal frequency of the first signal at maximum amplitude converted to the IF are correlated. The presence of the inserted first signal is detected based upon the result of the correlation. In another method, a pair of first signals are inserted on the cable system.

Abstract: A suspended line resonator and a tunable filter comprising multiple suspended line resonators. A microstrip resonator and a tunable filter comprising multiple microstrip resonators. A suspended substrate resonator and a tunable filter comprising multiple suspended substrate resonators.

Abstract: A method and apparatus for detecting leakage of a digital CATV channel signal from a CATV system. The digital CATV channel signal is amplitude modulated with a tag signal having a frequency in the range of about 3 Hz to about 35 Hz, and coupled to the CATV system. At a point of leakage from the CATV system, the amplitude modulated digital CATV channel signal can be detected using a leakage detector capable of recovering the tag signal.

Abstract: A method for displaying the status of at least a portion of a CATV system comprises providing a first layer including first geographic indicia, selectively overlaying a second layer including second indicia of the CATV system in a region illustrated in first layer on the first layer, and selectively overlaying a third layer including third indicia of reports of anomalies in the operation of the CATV system equipment in a geographic region illustrated in the first layer. A display thus includes a first layer containing first geographic indicia, a second layer displaying second indicia of the CATV system in the region illustrated in the first layer, and a third layer containing third indicia of reports of anomalies in the operation of the CATV system equipment in the geographic region illustrated in the first layer.

Abstract: A method of identifying a source of ingress into a network includes storing frequency spectra of known sources of ingress, comparing the frequency spectrum of ingress to the frequency spectra of known sources of ingress, and determining from the comparison which of the frequency spectra of known sources of ingress is closest to the frequency spectrum of the ingress. Apparatus for identifying a source of ingress into a network includes memory for storing frequency spectra of known sources of ingress and a device for comparing the frequency spectrum of the ingress to frequency spectra of known sources of ingress and determining from the comparison which frequency spectrum of a known source of ingress is closest to the frequency spectrum of the ingress.

Abstract: An underwater diving mask for use by a diver in an underwater diving environment has a viewing portion defined by the diver's face and a lens, a visual display device proximate the viewing portion to provide visual images to the diver, a speaking chamber configured to sealing engage a portion of the diver's mouth to permit the diver to speak, and a sound transducer located proximal the speaking chamber. A computer system is disposed in a portion of the mask and is operatively coupled to the sound transducer and to the visual display device, where the computer system, the viewing portion and the speaking chamber are sealing isolated from the underwater diving environment.

Abstract: A method of determining the location and/or amplitude of a leakage signal from a network includes measuring at various times and locations leakage believed to be associated with the leakage signal and constructing a data base of leakages and associated locations. Leakage signal values are selected from the data base. Each of the selected leakage signal values is multiplied by a locus of points on which a leakage signal associated with that respective signal strength may be assumed to reside in order to develop a number of relationships among leakage signal strength, leakage and location. A first pair of these relationships among leakage signal strength, leakage and location is solved for a first locus of points common to the first pair. A second pair of these relationships among leakage signal strength, leakage and location is solved for a second locus of points common to the second pair.

Abstract: A method and apparatus for delivering a decoded first signal related to a current or predicted condition of a geographic area across a network serving the geographical area to user apparatus. The network includes a headend, at least one source for providing an undecoded first signal related to the current or predicted condition of the geographic area, at least one decoder and at least one encoder. The method comprises decoding the first signal, transmitting the decoded first signal across the network, receiving the decoded first signal and generating a second signal for transmitting across the network to user apparatus in the geographic area. The apparatus and methods permit the collection of information, bringing of the information to a common point, decoding of the information if necessary, and distribution of the information to the appropriate address(es) on the network to which data can be addressed, received, assembled and displayed or played back.

Abstract: An apparatus for testing the phase linearity of a network comprises a first local oscillator, a first mixer, and a first filter, a second local oscillator, and a second mixer for mixing the first IF to the desired output frequency. The output of the second mixer is coupled to a second filter which passes the desired frequency band, but rejects the high frequency mixing harmonics produced in the second mixer. The output of the second filter is coupled to a variable gain amplifier capable of amplifying the frequency band of interest to the desired level and a third filter which further rejects unwanted high frequencies in the output.

Abstract: Underwater position determination is provided by combining sonar-derived ranging data between a sonar receiver and a sonar transmitter with GPS position data to provide geographically-referenced position data accurately representing the position of a sonar receiver carried or worn by a diver or submersible vehicle. Function and accuracy enhancements are provided to compensate for diver and sonar transmitter and depth difference and differences of sonar signal propagation speed as well as several techniques of compensation for change of position of the GPS receiver and for logging diver and/or vehicle path.

Abstract: An attenuator includes a substrate having first and second surfaces and a plurality of discrete circuit elements. The first surface includes a first electrically conductive pattern providing circuit contacts providing electrical connections among the discrete circuit elements and circuit contacts providing electrical connections to components external to the attenuator. The second surface includes a second electrically conductive pattern.

Abstract: An attenuator includes a housing defining an interior, a front, a rear, and a rotor mounted between front and rear for rotation within housing about an axis of the rotor. First electrical contacts are provided on the housing. Second electrical contacts are provided on the rotor. The rotor includes multiple printed conductor boards. Each PC board includes an electrically relatively non-conductive substrate. One side of each substrate provides conductive areas through which electrically attenuating elements of the attenuator are coupled together to form an attenuating network providing a selected level of attenuation. Electrical contact is made between the first electrical contacts and the electrically attenuating elements of the attenuator through the second electrical contacts.

Abstract: An attenuator includes a housing defining an interior, a front, a rear, and a rotor mounted between front and rear for rotation within housing about an axis of the rotor. First electrical contacts are provided on the housing. Second electrical contacts are provided on the rotor. The rotor includes multiple printed conductor boards. Each PC board includes an electrically relatively non-conductive substrate. One side of each substrate provides conductive areas through which electrically attenuating elements of the attenuator are coupled together to form an attenuating network providing a selected level of attenuation. Electrical contact is made between the first electrical contacts and the electrically attenuating elements of the attenuator through the second electrical contacts.