Abstract: Apparatus for transmitting and receiving digital information over mobile communication channels. The apparatus includes a pilot symbol insertion device for periodically inserting data dependent pilot symbols into frames of digital data for subsequent channel estimation, a continuous phase modulator for modulating and transmitting over a mobile communication channel the frames of digital data and means for receiving and filtering the transmitted data. A channel estimator estimates the channel amplitude and phase distortion from the received pilot signal at different time instants. Means are provided for demodulating the received signal and for decoding the demodulated signal to recover the estimated transmitted data.

Abstract: Water to be purified is directed into a first tank and is entrained with ozone. The ozonated water is channeled into a second tank and is exposed to ultraviolet radiation. An ultraviolet radiating lamp produces the ultraviolet radiation and also is exposed to a source of air for generating ozone. The generated ozone is conveyed to and entrained in the water in the first tank. A filter may be used to filter the water flowing into the first tank. A discharge conduit conveys the ozonated, irradiated and purified water to a point of use.

Abstract: A saw blade includes a very shallow cone shaped side for supporting an abrasive surface to sand smooth a cut surface of a work piece while the surface is being cut by the saw blade. To maintain the finished sanded surface of the cut perpendicular to a specified axis of the work piece, the axis of rotation of the saw blade is tilted to place a radial of the cone shaped abrasive surface orthogonal in three axis to the direction of saw cut being made.

Abstract: A switched capacitor input sampling circuit in a chopper stabilized delta sigma modulator includes first and second input terminals adapted to receive a differential analog input voltage therebetween and first and second terminals coupled to first and second charge summing conductors, respectively, of the delta sigma modulator.

Abstract: A catheter for use in an electrophysiological procedure to ablate a site includes a metallic tip having a first work function and energized by a source of RF energy. The RF energy return path is through a relatively large plate of a metallic material having a second work function and disposed at a location removed from the ablation site. The difference in work functions of the tip and the plate, operating in the presence of an electrolyte represented by the intermediate tissue, produces an exchange of electrical charges through chemical reaction to create a galvanic cell. By loading the galvanic cell with a shunt resistor, it becomes a current source providing a current linear with and highly dependent on the tissue temperature at the ablation site. This accurate representation of the tissue temperature at the ablation site is used to regulate the RF energy applied to maintain the tissue at the ablation site at a predetermined temperature during the ablation procedure.

Abstract: An inverter device is provided which comprises an inverter including a pair of transistors, and first and second delay circuits. The first and second delay circuits are connected to respective inputs of the pair of transistors so as to cause the transistors of the pair to switch with a greater time difference, thereby reducing noise due to switching operations in the inverter.

Abstract: Programmable resolution/bias current control circuitry is provided in a delta sigma analog-to-digital converter including an input sampling circuit, a feedback reference sampling circuit, an integrator including an operational amplifier, a comparator, and a digital filter, the input sampling circuit and the feedback reference sampling circuit being coupled to a first input of the operational amplifier, an output of the operational amplifier being coupled to an input of the comparator, an output of the comparator being coupled to an input of the digital filter. The programmable resolution/bias control circuitry includes a clock generator circuit supplying a clock signal to the input sampling circuit and the feedback sampling circuit at a sampling frequency determined by a sampling frequency control signal. A bias current generator circuit supplies a bias current to the operational amplifier to control the settling time of an output step voltage signal produced by the operational amplifier.

Abstract: An oversampling digital-to-analog converter is provided with an auto-muting circuit which reduces noise in an analog output signal when a digital input signal remains at zero. Auto-muting circuit includes an input reference level code detection section which detects an input reference level code in the digital input signal. An output reference level code in a modulated output generated from an oversampling modulator is detected by an output reference level code detection section provided in the auto-muting circuit. A modulated output alteration section is provided which operates in response to the result of the detections to selectively pass the modulated output without any alteration or alter the modulated output by substituting it with output reference level codes.

Abstract: A pharmaceutical composition of water, water soluble vinyl polymer gel, amine alcohol dispersant and IEP is used topically to treat herpes labialis and aphthous stomatitis lesions, and also to treat herpes genitalis chicken pox, allergic conjunctivitis, giant papillary conjunctivitis, stomatitis secondary to chemotherapy, thermal burn, sunburn, decubitus ulcers and shingles.

Abstract: A key cutting machine includes a cutter wheel, a key follower and a key positioning fixture for retaining a master key and a key blank in defined positions. Longitudinal and lateral displacement elements displace the cutter wheel and the key blank relative to each other. First and second electronic position sensors generate cutter wheel longitudinal and lateral position signals which electrically define the position of the cutter wheel relative to the key blank blade. A mode control system selectively operates the key cutting machine in either an analog mode where the bit notch pattern of a master key is mechanically traced and duplicated in the key blade blank or in a digital mode in which an electronically defined bit notch pattern is electrically duplicated in the key blank blade without reference to or tracing the master key bit notch pattern.

Abstract: A device for securing a previously removed cranial plate in position in a cranium to prevent relative movement between opposing bone edges includes a pin containing distal and proximal shanks having ends tapering to a relatively sharp point. The shanks are arranged preferably symmetrically about a central collar which has a dimension transverse to the longitudinal axis of the shanks greater than the diameters of the shanks so that the collar forms distal and proximal opposing shoulders for limiting the insertion depth of the pin.

Abstract: A coupling having an extending repositionable discharge tube for engagement with a discharge hose is mechanically lockably attachable to either of two different conventional waste water discharge outlets mounted on a recreational vehicle. Each of the waste water discharge outlets includes a set of four equiangularly spaced dogs and the set of dogs on each discharge outlet is differently configured. The coupling includes a different set of locking slots disposed at each end for receiving and lockingly engaging a corresponding one of the two sets of dogs. The discharge tube is relocatable to extend from one end of the coupling to permit engagement of the set of slots in the other end of the coupling with the set of dogs corresponding with the discharge outlet.

Abstract: A baby car seat air bag protector includes a baby car seat for securing an infant in a reclined position upon a conventional car seat. The air bag protector includes a lateral bar that extends laterally above and around the chest of the infant. The opposing side ends of the lateral bar are releasably secured to opposing sides of the baby car seat. An upper bar extends perpendicular to the lateral bar around the infant's head. The lower end of the upper bar is secured to the central region of the lateral bar. The upper end of the upper bar is releasably secured to the upper edge of the back portion of the baby car seat. The side ends of the lateral bar, and the upper end of the upper bar, include clamps for releasably grasping edge portions of the baby car seat. The upper bar may be pivotally connected to the lateral bar to allow the upper bar to be displaced when placing a child into, or removing a child from, the baby car seat.

Abstract: One end of a sleeve is inserted into a waste water discharge outlet of a recreational vehicle until an annular flange abuts the discharge outlet. Each of a plurality of plastic ties interconnects one dog attendant the discharge outlet and the annular flange to retain the sleeve in engagement with the discharge outlet. A cap is removably attached to the other end of the sleeve to close the sleeve when a conventional discharge hose is not mounted on the other end of the sleeve. The cap may include a hollow threaded boss for threadedly engaging the end of a garden hose. A further removable cap is included for the boss to accommodate closure of the boss.

Abstract: A bow limb includes an elongated member having a plurality of strands of glass fiber extending longitudinally within the member and a reinforcing sheet adjacent a major surface of the member, preferably the convex surface of the limb when the limb is flexed. The sheet includes a plurality of carbon fibers that are either unidirectional or bi-directional and, if bi-directional, are woven with the warp of the fibers at an angle to the length of the limb. The angle is adjusted to control the characteristics of the limb.

Abstract: A computer desk module has a trapezoidal desk top with an opening. A transparent window plate is supported in the desk top so as to cover the opening. A pull-out keyboard shelf is supported under a front edge portion of the desk top. A computer monitor is suspended under the desk top so its screen is inclined upward to allow viewing of the screen through the window plate. A plurality of the computer desk modules are assembled end-to-end into various semi-trapezoidal clusters, S-shaped clusters, and straight line clusters. Overhead power and data bus cables are routed from a classroom ceiling into tubular legs supporting a decorative cover against the ceiling. The legs extend upward from a cabinet having a semi-octagonal shape that mates with a semi-octagonal cluster of the computer desk modules. The cables pass through the legs, through the cabinet, into the various computer desk modules forming the cluster, and to the monitor and a computer in each of the computer desk modules.

Abstract: A tire monitor includes a pressure sensor, a temperature sensor, an A/D converter, and a microprocessor. The microprocessor has a sleep mode for conserving power and an output of the microprocessor controls the power applied to the pressure sensor and to the temperature sensor. A modulator and antenna are coupled to the microprocessor for transmitting data from the tire. Coupling between a monitor and a receiver is enhanced by extending a receiving antenna downwardly from the chassis of the vehicle, e.g. from the frame of a tractor.The tire monitor is fabricated on a small printed circuit board with terminals for programming or encoding each monitor with a unique identification code during manufacture of the monitor. Terminals are also provided for disabling the transmitter with a jumper until the monitor is installed in a tire.