Abstract: A high bandwidth data interface in an aircraft includes a pulse tolerant, non-inductive resistor for reducing surge current due to lightning transients, and a very low capacitance transient voltage suppressor to suppress the lightning transient voltages. A cable equalizer/redriver then recovers the original high bandwidth input signal. The high bandwidth interface is thereby able to survive DO-160 section 22 level 3 and 4 lightning transients.

Abstract: By provided with a first extraction unit configured to extract a communication setting value corresponding to a communication cable provided to a first connector, from communication setting information, based on cable information gathered by a first gathering unit, a first setting unit configured to set the communication setting value, to a first storage device of a first communication switch, a first activation unit configured to activate a port of the first communication switch, and a first synchronization unit configured to cause a management apparatus to carry out an activation of a port of a second communication switch provided in a communication apparatus in synchronization with the activation of the port, the flexibility of configurations employing communication cables is improved.

Abstract: A detection apparatus includes a first acquisition part that acquires information about a suppliable electric power of a power supply apparatus that supplies an electric power to a power reception apparatus via a transmission path; a second acquisition part that acquires information about a supply electric power output from the power supply apparatus, including information about a supply voltage output from power supply apparatus; a third acquisition part that acquires information about a voltage applied to the power reception apparatus after a voltage drop in the transmission path; and a margin information calculation part that calculates first margin information about a margin of a supply electric power, and calculates second margin information about a margin of the voltage drop.

Abstract: A method and apparatus charge devices using a multiple port power supply. The apparatus can include a power supply. The apparatus can include a first device charging port coupled to the power supply. The first device charging port can receive power from the power supply and output power to a first device. The apparatus can include a second device charging port coupled to the power supply. The second device charging port can receive power from the power supply and output power to a second device. The apparatus can include a device charging port monitor coupled to the first device charging port and coupled to the second device charging port. The device charging port monitor can detect a number of device charging ports in use. The apparatus can include a cable compensator coupled to the device charging port monitor. The cable compensator can select a first cable compensation if one device charging port is in use and can select a second cable compensation if two device charging ports are in use.

Abstract: An oscillator includes a comparison means suitable for generating a comparison signal by comparing an internal voltage of an internal node with a reference voltage; an inverting unit suitable for inverting the comparison signal and transmitting the inverted comparison signal to an output node; a pull-up driving unit suitable for pull-up driving the internal node in response to the voltage of the output node; a discharge unit suitable for discharging the internal node; and a gate coupled between the internal node and the discharge unit, and turned on/off in response to the voltage of the output node, wherein at least part of a capacitive load included in the oscillator is electrically coupled to the internal node.

Abstract: Systems and methods to provide automatic compensation for frequency attenuation of a video signal transmitted over a cable are provided. Frequency compensation is applied to a received video signal that was transmitted over the cable to thereby produce a compensated video signal. A shape of a horizontal sync portion of the compensated video signal is analyzed. The frequency compensation is automatically adjusted based on the shape of the horizontal sync portion of the compensated video signal. This abstract is not intended to be a complete description of the various embodiments of the present invention.

Abstract: A superconducting filter apparatus having a refrigerator for cooling the superconducting filter to cryogenic temperatures, a pilot signal generator for generating a pilot signal that is outside the pass band and inputting the pilot signal to the superconducting filter together with an antenna receive signal, and a discriminating unit for discriminating abnormality in the refrigerator. If the refrigerator malfunctions and temperature of the superconducting filter rises, the pass band of the superconducting filter shifts to the low-frequency side and crosses the frequency of the pilot signal. The pilot signal passes through the superconducting filter at this time. The discriminating unit discriminates abnormality in the refrigerator based upon the pilot signal contained in the output of the superconducting filter.

Abstract: An equalizer and an equalization method capable of suppressing distortion specific to radio unit and reducing both the oversampling number and the amount of calculations without causing characteristic deterioration.

Abstract: An apparatus (7) for switching from a first pilot signal and a second pilot signal on a system transporting a plurality of signals. A tuner (30) receives the signals and provides an output signal to a loop compensation circuit (26). The tuner includes a bandpass filter (22) for removing signals other than the selected pilot signal from the output of the tuner. The output of the bandpass filter is provided to a detector circuit (24, 25). The output of the detector is compared with a reference signal (28) by the loop compensation circuit (28). A microcontroller (39) sends a tuning command to the tuner which causes the tuner to switch from tuning to the first pilot signal to tuning to the second pilot signal and also sends a new reference voltage to the loop compensation circuit. Thus, if the input signal changes from analog to digital modulation on the pilot channel, the set-point, or target level of the reference signal, will automatically change to provide the correct value for operation of the circuit.

Abstract: Method and system for a programmable analog tapped delay line filter are disclosed. One embodiment of the present invention is a programmable analog tapped delay line filter comprising an input line, an output line, and one or more gaincells or taps coupled between the input line and the output line. The input and output lines each comprises a cascade of one or more differential delay cells, and each of the one or more gaincells or taps corresponds to a tap weight or coefficient. Furthermore, the input and output lines are terminated in impedances and the filter produces one or more outputs.

Abstract: A compact frequency multiplier can perform high-degree frequency multiplication and can be incorporated in a wireless device. The frequency multiplier includes an input terminal for inputting an input signal, a first resonant circuit resonating with the frequency &ohgr; of the input signal, a second resonant circuit and an idler circuit, which resonate with the frequency n·&ohgr; that is, n times the frequency of the input signal, a variable reactor such as a varactor diode, coupling-adjusting capacitors, a bias resistor, and an output terminal for outputting multiplied output signals. In one embodiment, the frequency multiplier is a current-excitation type. The first resonant circuit and the second resonant circuit, each of which is constituted of an LC series resonant circuit, are connected in series between the input terminal and the output terminal.

Abstract: In a circuit arrangement for demodulating an intermediate-frequency video signal generated while using a Nyquist edge, having a phase-locked loop (1) including a phase detector (3), a loop filter (4) and a voltage-controlled oscillator (5), and a video demodulator (2), the intermediate-frequency video signal being applied to the phase detector (3) and the output signal of the phase-locked loop (1) being applied to the video demodulator (2), which converts the intermediate-frequency video signal into a baseband video signal, phase fluctuations contained in the carrier of the intermediate-frequency video signal due to its generation while using a Nyquist edge are compensated in that the phase comparator (3) operates, by approximation, independently of modulation in the control range of the intermediate-frequency video signal, in that the baseband video signal is present in an inverted form with respect to the intermediate-frequency video signal, and in that a correction signal is derived from the baseband video

Abstract: The object of the present invention is to reduce the man-hours for correction of the frequency characteristic of an optical network thereby to augment the productivity.

Abstract: At least two information waveforms are transmitted over the same communications channel using Lincompex techniques. Each of the information waveforms are modulated using Lincompex techniques to generate compressed information waveforms and associated control tones. The compressed information waveforms have the same frequency band. The compressed information waveforms and associated control tones are arithmetically combined, and transmitted over a transmission medium. These signals are then received from the transmission medium. A plurality of Lincompex expanders demodulate the received signals using Lincompex techniques and one of the associated control tones.

Abstract: An RF transport system delivers a phase-stable RF signal to a load, such as an RF cavity of a charged particle accelerator. A circuit generates a calibration signal at an odd multiple frequency of the RF signal where the calibration signal is superimposed with the RF signal on a common cable that connects the RF signal with the load. Signal isolating diplexers are located at both the RF signal source end and load end of the common cable to enable the calibration to be inserted and extracted from the cable signals without any affect on the RF signal. Any phase shift in the calibration signal during traverse of the common cable is then functionally related to the phase shift in the RF signal. The calibration phase shift is used to control a phase shifter for the RF signal to maintain a stable RF signal at the load.

Abstract: An equalizer characteristic of an amplitude equalizer for use in a modulating and demodulating device (MODEM) can be set with considerable ease. One of a plurality of equalization characteristics assigned to an amplitude equalizer is set by generating and feeding to a transmission line a plurality of reference signals at the same level but with respectively-different frequencies. Each of such respective reference signals are received from the transmission line, separated, and measured as to its reception level. Level errors are then determined between each measured reception level and an estimated reception level previously determined in association with a respective one of the equalization characteristics. A selection and setting is then made of one of the equalization characteristics that is associated with one of the estimated receptions levels having the smallest level error.

Abstract: A system for transmitting and receiving frequency modulated signals utilizes linked compressor/expander (Lincompex) techniques. The signal to be transmitted is first processed by a Lincompex modulator which infinitely compresses the signal and produces a control tone representative of this compression process. After being processed by the Lincompex modulator, the compressed signal is frequency modulated and transmitted. A receiver having a Lincompex demodulator is used to receive the modulated signal. The received signal is initially demodulated by a discriminator prior to being expanded by the Lincompex demodulator according to the received control tone.

Abstract: A high speed, variable gain video preamplifier circuit disposed on a single IC which can accommodate multiple video input channels supplied by cables of varying length. A multiplexer 34 uses information about the cable length supplied to input pads to selectively connect the outputs of several series connected compensating amplifiers 42(a-b), 44 and 46 to the variable gain amplifier 36. The preamplifier circuit is characterized by a comparative wide common mode input range, as well as being capable of accepting two input channels and providing efficient cable compensation.

Abstract: A broadband local area network transmits outbound signals in an outbound frequency band and inbound signals in an inbound frequency band. In one configuration, the network comprises a central hub and a plurality of nodes connected to the hub. Each of the nodes comprises a bidirectional amplifier having a fixed gain across the entire inbound and outbound bandwidth and a line balancer. The line balancer includes a variable cable simulator circuit for simulating the loss of a variable amount of coaxial cable and an equalizer circuit for equalizing the loss of a fixed amount of coaxial cable. The network also includes a plurality of remote outlet clusters. Each remote outlet cluster is connected to one of the nodes by a coaxial transmission path and comprises a fixed attenuation and a RF splitter having a plurality of outlets for connection to user devices. The number of outlets of each remote outlet cluster depends on the length of the transmission path to the node to which it is attached.

Abstract: An easy to install and easy to expand broadband local area network is disclosed. The network has a star-type architecture based upon a fixed-gain, fixed-loss approach to amplification and a star-feeder approach to providing user connection to the network.

Abstract: A device including automatic gain control for balancing losses in a coaxial transmission path of a network is disclosed. The device includes a fixed gain bidirectional amplifier, an equalizer circuit for equalizing the loss of a fixed amount of cable a circuit for providing a variable amount of loss for simulating a variable amount of coaxial cable, and a closed loop system for monitoring the signal strength of an outbound pilot signal. The closed loop system provides for adjustment of the variable simulator circuit so that the sum of the losses provided by the coaxial transmission path, the equalizer circuit and the variable simulator circuit are equal in amplitude to the gain of the fixed gain amplifier across the entire inbound and outbound bandwidth of the network.

Abstract: In addition to an information signal subjected to a frequency dependent and a frequency independent loss component and delivered to an automatic equalizer through a transmission path which is typically a subscriber's communication path between a subscriber's terminal equipment and an exchange, an equalizer input signal comprises a pilot signal subjected to the frequency independent loss component alone. The equalizer comprises a first equalizer (26, 27, 36) responsive to a pilot signal component derived from the pilot signal for compensating for the frequency independent loss component. A second equalizer (31, 32, 37) compensates for the frequency dependent loss component in response to an information signal component derived from the information signal. The first and the second equalizers are cooperative in various manners in equalizing the input signal into an equalizer output signal. The pilot and the information signal components are extracted either directly or indirectly from the input signal.

Abstract: In a companding arrangement, the presence of a tone in only one of the two transmission directions is detected. Upon such detection, for example during set-up of a telephone call via a satellite transmission channel, the tone is compressed or expanded, depending on its transmission direction, separately from the remainder of the signal using a second compander. Companding is thus effected using two companders operating at different amplitude levels, with a consequent noise level reduction. A single bandpass filter is used to separate the detected tone, switches being controlled by the tone detection to couple the bandpass filter selectively for operation in either transmission direction.

Abstract: An automatic equalizer comprises a transversal filter connected to receive an input signal such as a television signal in which a predetermined periodic reference signal is present and having variable tap gains, and a correlator for forming the correlation between the input and output signals of the transversal filter and correcting the tap gains of the transversal filter to cancel out distortion components such as ghost component contained in the input signal. For the purpose of preventing the slow convergence and fluctuation of tap gains of the transversal filter due to non-periodic noise components contained in the input signal, a circuit is further provided to integrate a predetermined portion of the waveform of the reference signal contained in the input signal. An output signal of the waveform integrator circuit is correlated with the output signal of the transversal filter by the correlator.

Abstract: A syllabic compandor using a pilot in the signal frequency band, with a compression ratio between approximately 2 and 20, including a frequency and delay equalizer in the negative-feedback loss-control circuits of the compressor and expandor, to permit high compression and expansion ratios without positive feedback at any frequency or signal level, the expansion ratio materially less than the compression ratio in some cases, and sampling at more than the Nyquist frequency for the signal band to remove any unwanted periodic wave such as the pilot wave, lying in the signal frequency band, from the output, without altering phase and amplitude of other waves in the signal frequency band.

Abstract: An automatic polarization decoupling circuit for decoupling first and second signals originally transmitted with orthogonal polarizations comprising a rotatable quarter-wave plate and a rotatable half-wave plate for linearizing the first signal and rotating its polarization direction to a reference polarization direction, an Orthomode (trademark) transducer for separating energy in the reference polarization direction from energy with a polarization in quadrature thereto and utilizing this quadrature energy as the decoupled second signal. The system further comprises a second Orthomode transducer for recombining the in-phase and quadrature energy separated by the first Orthomode transducer and applying this recombined energy to a second rotatable quarter-wave plate and a second rotatable half-wave plate for linearizing the second signal and rotating its polarization direction to a direction in quadrature with the reference polarization direction.

Abstract: A control signal x(t) of known characteristics is transmitted over a transmission channel (1) together with a useful signal y(t).

Abstract: In a long line transmission system, the signal level at the transmission station is pre-equalized by the value L.sub.s which is adjustable according to the signal level at the receiving station. The receiving station equalizes the received signal to the standard level at the output of the receiving station. The difference between the actual level L.sub.r at the input of the receiving station and the standard level there, is fed back to the transmission station through a return transmission line, and said difference is utilized to adjust the pre-equalization value L.sub.s at the transmission station. The ratio L.sub.s /L.sub.r is controlled to be constant by the operation of the pre-equalization level distributor installed at the transmission station.

Abstract: The invention consists in an equalization system with two sections, one at each end of a transmission channel. The section at the transmission end adds control signals to information signals to be transmitted over the line. The section at the reception end generates control signals identical to those added at the transmission end and in phase with the control signals received over the transmission channel, which are separated from the received information signals by means of a first transversal filter with controllable weighting coefficients, the reciprocal transfer function of the transmission channel being synthesized from the locally generated and the received control signals by means of a second transversal filter with controllable weighting coefficients, equalization being achieved by means of a third transversal filter with the same design and same weighting coefficients as the second transversal filter. The invention is applicable to the transmission of data over telephone lines.

Abstract: The invention relates to transmission systems and in particular to level regulators controlled by a pilot tone and used in such systems to correct variations over a period of time in the attenuation of the transmission system.The subject of the invention is a level regulator governed by a pilot tone whose gain control circuit locks in a mean position where there is a very low or zero value detected for the pilot tone. This locking is achieved by modifying the supply voltage of the error amplifier of the loop providing automatic gain control for the regulator.The invention is of particular application to cable transmission systems with repeaters.

Abstract: A cable equalizer is provided for automatically compensating a signal for cable attenuation as the length of the cable is varied. The circuit detects changes in a reference signal that is inserted in the signal being transmitted over the cable. Any deviation of the reference signal from its normal state at the receiving end of the cable causes the addition of a correction signal to the signal being transmitted so as to compensate the signal for the cable attenuation.

Abstract: A system equalizer and a method of equalization employed in a repeatered submarine cable system, in which automatic gain controlled (AGC) submerged repeaters are employed to compensate for fluctuations of the cable loss caused by the temperature fluctuations in the surrounding environment of the repeatered submarine cable system. In a terminal equipment connected to the repeatered submarine cable system, the seasonal misalignment of the repeatered cable system is equalized by a switchable equalizer having a loss-frequency characteristic corresponding to the total of compensation errors in the AGC submerged repeaters. Short-term level fluctuations of the repeatered cable system are compensated by an automatic equalizer, which has a loss-frequency characteristic proportional to the square root of frequency f and is controlled by the level of a pilot signal transmitted through the repeatered submarine cable system. An unknown fixed deviation is finally equalized by a second adjustable equalizer.

Abstract: An adaptive equalizer to compensate for the effects of frequency-selective fading on a microwave radio system. The equalizer includes two Bode-type bump networks and an AGC amplifier whose slope and gain are respectively controlled by pilot tones added to the message load. Importantly, the frequency characteristics of the two Bode networks are non-overlapping, thus ensuring stability.

Abstract: The invention relates to a device for the remote adjustment of a switchable network equipping an unattended station on a transmission line, by means of remote control frequencies emitted from a terminal station on this line. The device enables the remote control of a motor actuating a switch which operates said switchable network. The moving of the switch, and then the adjusting of the network, can be followed at the terminal station from the observing of the level of a return frequency sent back from the unattended station to the terminal station.

Abstract: One embodiment is directed to a system for providing wireless coverage and capacity for a public land mobile network within a building. The system comprises a pico base station comprising multiple transceiver units. The pico base station is installed in the building. The system further comprises a plurality of antennas located within the building. The plurality of antennas are located remotely from the pico base station. The pico base station is communicatively coupled to the public land mobile network. The pico base station is communicatively coupled to the plurality of antennas.