Spectrum analyzer

About: Spectrum analyzer is a research topic. Over the lifetime, 12217 publications have been published within this topic receiving 101851 citations.

Life pattern analysis and enunciation system

Abstract: PURPOSE: To analyze the life pattern and living condition from the way an electric apparatus is used for selt-checking of changes and abnormality of life of a high-aged person and for protection by an external organization. CONSTITUTION: A current detecting section 31 is mounted on an electric wire and an output thereof is inputted into an analyzer 3 having a communication interface 38 from a pretreatment section 32. The analyzer 3 possesses data of reference power spectrum of consumed current corresponding to apparatuses in a memory. A current signal is digitized with a pretreatment section 32 and undergoes a fast Fourier transform with a processor 9 to make an extraction power spectrum. The spectra are compared with the reference power spectrum and when the reference power spectrum of a specified apparatus is contained in an extraction power spectrum, the use of the apparatus is stored into a memory together with time. The results are displayed on an output section 36 at any time to be sent to an external organization through a communication circuit 37. This enables self-checking of living condition and rhythms from the way an electric appratus is used and thus, life information can be transmitted to the external organization with the communication circuit. COPYRIGHT: (C)1992,JPO&Japio

An Electronic Differential Analyzer

Abstract: An electronic differential analyzer is described, capable of solving ordinary differential equations of orders through the sixth, both linear and nonlinear, and with coefficients that are either constant or variable. This analyzer has a high speed of operation and is extremely flexible with regard to equation parameters and initial conditions. The flexibility permits rapid investigation of wide ranges of equation solutions with regard to periodicity, instability, and discontinuities. It renders practicable the solution of end-point boundary-value problems; that is, problems in which the final rather than initial values are specified. Two new computing elements, an electronic function generator and an electronic multiplier, are employed in this differential analyzer. A diode clamping circuit permits the use of ac coupled amplifiers. A number of representative differential equations of the linear and nonlinear types have been solved. Comparison of observed and calculated solutions reveals an accuracy of from 1 to 5 per cent, while the precision (or repeatability) of the solutions ranges from 0.002 to 0.1 per cent. An analysis of the errors introduced into the differential-equation solutions by the frequency limitations of the computing elements, such as the integrators and adders, has been made, and the results of this analysis have been verified experimentally.

Routing YIG-tuned mixer

Abstract: A routing YIG-tuned resonator filter integrated with an image-enhanced, double-balanced mixer. The YIG-tuned resonator filter is preferably a four-sphere YIG-tuned preselector which is integrated with a low-loss, fundamentally or harmonically mixed, image-enhanced, double-balanced mixer to provide a high level of dynamic range in a harmonically mixed front end. An input resonator of the preselector in combination with a dual PIN diode switch switches low-frequency input signals (e.g., 0 to 2.9 GHz) to a low-band mixer. For RF input signals (e.g., 2.7 to 26.5 GHz), the four-sphere YIG-tuned preselector is combined with the image-enhanced, double-balanced mixer which incorporates a GaAs monolithic diode bridge integrated circuit. This provides a cost effective front end for a microwave spectrum analyzer.

Spectrum analyzer for reading authentication marks

Abstract: A spectrum analyzer determines the light emission characteristics of an authentication mark that is invisible when illuminated with visible light but is visible when illuminated with IR light. The spectrum analyzer includes an IR light source, a mirror positioned to deflect light from the IR light source in a direction that is substantially perpendicular to a surface of the authentication mark, a first lens for collimating light that is emitted by the authentication mark in response to an illumination by the light from the IR light source, an optical element comprising a prism or a hologram for generating a spectrum from the collimated light, a second lens for imaging the spectrum, an IR light blocking filter, a detector positioned to receive light components of the spectrum after the spectrum has been imaged by the second lens and filtered by the IR light blocking filter, and a control unit connected to the detector and programmed to read the authentication mark based on intensities of the light components received by the detector.