Abstract: A system and apparatus for compensating cable losses in a video signal transmission system includes feedback circuits to determine the spectral attenuation of a received signal and to control an equalizer circuit to amplify selected frequencies of the received signal, and to determine the various times of arrival of two or more video signals and selectively adjust one or more delay lines to reduce the differences in their arrival times.

Abstract: Attenuation compensation volume computing means (60, 61, 62, 63, 67, 68, 69, 70) of a signal receiver computes attenuation compensation volume of a video signal (GL, GH) on the basis of attenuation of pulses which are arranged in a digital sound signal LRD from the signal transmitter, and video signal attenuation compensation means (60, 61) of the signal receiver compensates the attenuation of the video signal (RAT, GAT, BAT) on the basis of the computed attenuation compensation volume (GL, GH), thereby stably compensating the attenuation of the video signal irrespective of kinds of displays or resolution of an image, and outputting good sounds to a video output machine as well as good videos.

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 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: Avariable equalizer is described. The variable equalizer provides for independent control of a number of breakpoints in the frequency response of the equalizer so as to allow the equalizer to be readily tuned to compensate for the tilt of coaxial cables over a wide range of characteristic attenuation. In one embodiment, the variable equalizer includes a two port bridge “T” network with variable top and bottom branches that are independently and selectively adjusted to create a desired frequency response. For example, in one embodiment, the top branches include a number of variable RC networks and the bottom branches include a number of variable LR networks. In some embodiments, PEN diodes provide the variable resistance in these LR and RC networks.

Abstract: An adjustable directional coupler including a housing, a first connector and a second connector secured to the housing, and a main transmission line extending through the housing and between the first and the second connectors. The main transmission line has a center conductor coaxially surrounded by an insulator. A circuit board is secured within the housing, with a first edge of the circuit board being generally parallel to the main transmission line and the circuit board being transversely adjustable with respect to the main transmission line. At least one auxiliary line is mounted on the circuit board and includes a pick-up link extending from a network juncture. The pick-up link is adjacent to and parallel with the first edge of the circuit board. A third connector is also secured to the housing.

Abstract: A communications station (10) couples a bidirectional input-output signal path (16') to two unidirectional signal paths; a transmit signal path (12') and a receive signal path (14'), using a controllable hybrid (20). A feedback control system in the station minimizes the amount of transmit signal appearing at the receive output port (24) of the hybrid (20). The control system spreads the spectrum of a pilot signal (40) by means of a biphase modulator (46) and a pseudorandom generator (42) to produce a spread-spectrum pilot, which is added, in a summer 30, to the transmit signal. The spread-spectrum pilot signal covers the bandwidth of the information signal, and is reflected in an amount and with a phase which depends upon the relative impedance presented to the hybrid (20) by the bidirectional signal path (16').

Abstract: A reusable shopping bag assembly is provided. The assembly has collapsible expandable soft sided bags which can be rolled up from an upper open end in a spiral shape, the bags having a bottom end having a plurality of holes to permit air flow there through for allowing the bags to be rolled up into a compact shape. A pair of hanger bars are attached to opposite bag sides adjacent the upper open end of the bags. Opposite ends of each hanger bar extending beyond opposite bags sides for engagement with spaced apart upper edges of a shopping cart to suspend the bags in a shopping cart when the bags are unrolled. A carrying case is provided having a side opening. The side opening being adapted for insertion of the bags when the bags are in a rolled state so that the carrying case will encapsulate the bags.

Abstract: Disclosed is a device for automatically controlling the gain of a receiving channel in a system comprising optical connections having a very wide pass band.The useful signal of unknown level is transmitted with a pilot signal of known level through an optical connection, where it undergoes an attenuation, to a receiving assembly connected to an opto-electronic transducer at the output of the optical channel. A device for controlling the gain of the receiving channel commanded by the pilot signal digitally controls an attenuation circuit which thereupon restores the useful signal to its initial level.