Abstract:
A method and system for talker authentication in which a trial speech sample from a person who may be legitimate or who may be an imposter is compared to a standard speech sample of the legitimate person. The trial speech sample forms the input to a plurality of band pass filters. The outputs of each of the filters are integrated over the duration of the speech sample and the integrated signals are normalized. These normalized signals are compared to normalized signals of a standard speech sample to generate a plurality of difference signals. The magnitudes of the difference signals are added together to generate an authenticity signal, the magnitude of which corresponds to the correspondence between the trial speech sample and the standard speech sample.
Abstract:
Solid ionic salts exemplified by perfluoro ammonium hexafluoro antimonate having the highly energetic perfluoro ammonium cation (NF4 ), are produced by interreacting gaseous nitrogen trifluoride, gaseous fluorine, and liquid antimony pentafluoride (in the presence or absence of hydrogen fluoride), this reaction being preferably effected at a temperature of between about 100* C. and about 200* C., and at a superatmospheric pressure in the range of from about 50 atmospheres to about 200 atmospheres. The use of arsenic perfluoride, phosphorus perfluoride, or bismuth perfluoride, instead of the antimony perfluoride, results in the formation of the corresponding arsenate, phosphate or bismuthate salt, all of which are very stable, are powerful fluorination agents, and useful as oxidants.
Abstract:
A high-current vacuum system suitable for on-vacuum deposition of multiple layers onto a substrate. A vacuum chamber encloses a stationary substrate holder disposed above a plurality of vapor sources utilizing diverse heating elements. The vapor sources are arranged on a rotatable support for sequential movement to a deposition station for the vaporization and deposit of low and high temperature metals and dielectrics. Manipulators for making and breaking electrical contact to the station and for rotation of the support are positioned without the chamber and are externally operated to change sources without breaking vacuum. A liquid nitrogen cooled cold cam is situated between the station and the substrate support to funnel the vapor stream toward the stationary substrate target.
Abstract:
Field-forming devices primarily useful as field ionizers and field emission cathodes and having as a basic element an array of closely spaced cones with sharp points supported on a substrate (in the most usual case conductive or semiconductive) are disclosed. Preferably, the field-forming structure is completed by a screen-like structure, e.g. as fine mesh screen, insulatively supported above the points with the center of apertures in the screen substantially aligned with the longitudinal axis of corresponding cones. A novel method of forming such structures includes placing a screen with a mesh corresponding to the desired number and packing density of sharp conical points in close proximity to, or in contact with, the substrate and projecting material through the screen onto the substrate whereby sharp cones of the material are formed on the substrates.
Abstract:
An apparatus for depositing thin lines of conducting, semiconducting or dielectric material on a substrate including a crucible having a vaporizable material charge receiving chamber and a vapor chamber. A first tube for introducing a flow of carrier gas and a heated capillary tube penetrate the vapor compartment. On heating the crucible to a temperature above the evaporation temperature of the charge, the charge evaporates and is pushed through the capillary tube by the carrier gas. The stream of carrier gas and vapor deposits dots or lines on the target. Patterns are produced by translating the target with respect to the crucible.
Abstract:
The presence of nitrogen containing compounds is detected by sampling vapor in the vicinity of the suspected compounds, reacting the vapor under conditions to convert the compound to nitric oxide. The nitric oxide is reacted with atomic oxygen with the chemiluminescent emission of light. This light is detected to determine the presence of the suspected compound.
Abstract:
APPARATUS FOR CONDENSING AND COLLECTING MICROGRAM AND LARGER AMOUNTS OF ORGANIC VAPORS PRESENT IN A GAS CHROMATOGRAPHY EFFLUENT WITHOUT ENGENDERING FOG DROPLETS. THE APPARATUS COMPRISES A LENGTH OF SMALL ALUMINUM TUBING ADAPTED TO RECEIVE AN OPEN-ENDED CAPILLARY OR OTHER GLASS TUBE INTO WHICH THE GAS SAMPLE IS PASSED FOR CONDENSATION, SAID ALUMINUM TUBE BEING MOUNTED AT THE SAMPLE RECEIVING END IN A HEATED ALUMINUM BLOCK AND, AT THE OTHER END, IN A REFRIGERATED ALUMINUM BLOCK SPACED FROM THE HEATED BLOCK, AND WITH THE INTERVENING LENGTH OF TUBING BETWEEN THE BLOCKS BEING THERMALLY INSULATED SO AS TO PROVIDE AN EVEN TEMPERATURE GRADIENT ALONG SAID LENGTH RANGING FROM VAPORIZATION TO CONDENSATION TEMPERATURES. THE ORGANIC VAPORS PRESENT IN SAMPLE DIRECTED INTO THE GLASS TUBE ARE CONDENSED THEREIN, WHILE ANY INERT CARRIER COMPONENTS THEREOF ARE DISCHARGED FROM THE OPEN, DOWNSTREAM END OF THE TUBE.
Abstract:
A digital logic network for indicating whether a number of inputs, after appropriate weighting, is more or less than a particular threshold. The network utilizes an array of identical cells, each connected only to the immediately adjacent cells, to provide a two-dimensional arrangement adapted for realization by integrated semiconductor technology.