Abstract:
A circuit is provided for comparing alternating voltages without first rectifying them. In this circuit a capacitor and an amplifier circuit having high amplification are connected in series between each input and output terminal of the circuit, with a feedback circuit consisting of a diode device and a resistor being connected in parallel to each amplifier circuit and with the junction points of the diode devices and the resistors of the two feedback circuits being interconnected. In this manner a common threshold voltage will be achieved at the inputs of the amplifier circuits and thus, an output voltage only on the output terminal whose corresponding input terminal has been supplied with a higher input voltage.
Abstract:
A key telephone system is made for operation with either pushbutton or rotary dial equipment. Initially, digital signals are sent to one of two receivers which responds exclusively to pushbutton or rotary dials, respectively. These two receivers are connected to a common control circuit which supervises ringing and provides answer supervision to operate the key system, per se.
Abstract:
This system provides for automatic communications between the subscribers of public telephone networks and mobile sets over a large land area (or along a highway) covered by a plurality of radiotelephone exchanges. A call from a network exchange for a mobile is first transmitted to all these radio exchanges by a service-bus line. When one of the radio exchanges reaches the mobile in its area, it signals itself to the calling exchange and only then the calling exchange proceeds with the extension of the telephone toll connection to that radio exchange.
Abstract:
Awaiting call indicator system is associated with PABX operators'' desks. It enables measuring the duration of public network incoming lines congestions and makes it possible to estimate at any moment the number of awaiting calls. It displays the measurements made with the help of a luminous indicator, this latter to be so-called ''''call-awaiting thermometer.
Abstract:
APPARATUS FOR STACKING AT HIGH SPEEDS DOCUMENTS RANGING IN WEIGHT FROM THE VERY LIGHT TO THE RELATIVELY HEAVY, COMPRISING DOCUMENT PROPELLING MEANS, GUIDING AND AIR BLOWING MEANS, AND A STACKING RECEPTACLE. THE INVENTION INCLUDES A CURVED GUIDE FROME WHICH PROVIDES THE DOCUMENT WITH A CERTAIN BENEFICIAL STIFFNESS. PRESSURIZED AIR IS BLOWN THROUGH THE GUIDE FRAME PERPENDICULAR TO THE PASSING DOCUMENTS TO AID IN THE TRANSFER THEREOF FROM THE PROPELLING MEANS TO THE STACKING RECEPTACLE, AND FURTHER, TO PROVIDE FOR THE PREVENTION OF TRANSVERSE RIPPLE OF THE DUCUMENTS. SECOND AIR BLOW MEANS, RESPONSIVE TO DOCUMENT LENGTH DETECTING MEANS, ARE INCLUDED TO PREVENT THE FOLDING OR BUCKLING OF EXTRA LONG DOCUMENTS.
Abstract:
A mask identification system according to which a mask indication is originated having three parts: one first part specifically meant to indicate the length of a slice; a second part specifically meant to indicate the origin of this slice; a third part which will either complete the first part, in order to characterize the lengths of larger slices (the value which characterizes the origin of the slice being then necessarily small), or it will complete the second part, in order to characterize the origins of upper ranks (the value characterizing the length of the slice being then necessarily small), so that most of the values that the mask indication take up in its entirety are effectively utilized and the number of digits making up this indication are limited to a minimum.
Abstract:
A tuning arrangement for television receivers including a support, a rotary selector having predetermined fixed positions into which said selector may be set mounted on said support, a first tuning button having a beveled gear at one end thereof mounted on said selector, a plurality of stationary potentiometers mounted concentrically with said selector, one being opposite each of said fixed positions and each having a gear associated therewith for engagement with, and adjustment by said button, said button being movable into and out of engagement with the potentiometers, and a second tuning button, having a screwdriver end, mounted on said support, a plurality of rotatable cams controlling the position of a range selector switch, said cams mounted concentrically with said selector, one being opposite each of said fixed positions and being associated with one of said stationary potentiometers, and each having slot means associated therewith for engagement with, and adjustment by said second button, said second button being movable into and out of engagement with said cams.
Abstract:
An evanescent H-mode rectangular waveguide resonator having a tuning screw mounted on one broad wall is temperature compensated by having said screw physically penetrate close to the opposite broad wall of said waveguide. Said penetration provides significant end-loading capacitance. In one preferred embodiment, said screw is offset from the longitudinal centerline of said waveguide to achieve both the required tuning capacitance and the required penetration. In another preferred embodiment, to further improve temperature compensation, a silver-plated Swedish iron screw having a lower coefficient of expansion than the material of the waveguide, (i.e., copper) penetrates close to the opposite broad wall.
Abstract:
An end of a submarine coaxial cable is joined to an end of a repeater tail coaxial cable by replacing the free end of the aluminum outer conductor of the submarine coaxial cable with an aluminum alloy braid sheath, welding the sheath to the aluminum outer conductor, and fitting a composite water barrier assembly into the inner insulation at the free end of the submarine cable. The assembly comprises a copper alloy castellated sleeve, an aluminum alloy end piece friction welded to the castellated sleeve, and a high strength copper alloy liner. The aluminum alloy end piece is welded to the braided sheath, and the castellated sleeve is joined to the copper braid of the outer conductor of the repeater coaxial tail cable.
Abstract:
A pair of horizontally radiating vertically spaced antennas, A and B, radiate frequencies f and f+ delta f, respectively, from a first vehicle. On a second vehicle there is provided a receiver which is coupled to a pair of similarly mounted antennas, A1 and B1. Each antenna, A1 and B1, receives f and f+ delta f. Said receiver determines the phase difference between the best frequencies corresponding to f and f+ delta f at each antenna, A1 and B1, and determines therefrom the distance from said second vehicle to said first vehicle.