84 results about "Spectral energy distribution" patented technology

Fingerprints are bit strings extracted from a media signal (e.g. an audio or video clip) to identify said media signal. Typically, they are derived from a perceptual property of the signal, for example, the spectral energy distribution of an audio fragment or the luminance distribution of a video image. A method and arrangement for extracting a fingerprint is here disclosed which is robust with respect to shifts of the perceptual property. Such shifts occur, inter alia, when the fingerprint is derived from a logarithmically mapped spectral energy distribution of an audio signal and said audio signal is subjected to speed changes. According to the invention, the fingerprint is not derived from the perceptual property as such, but from its auto-correlation function.

A music retrieval system which take an input melody as the query. In one embodiment, changes or differences in the distribution of energy across the frequency spectrum over time are used to find breakpoints in the input melody in order to separate it into distinct notes. In another embodiment the breakpoints are identified based on changes in pitch over time. A confidence level is preferably associated with each breakpoint and / or note extracted from the input melody. The confidence level is based on one or more of: changes in pitch, absolute values of a spectral energy distribution indicator, relative values of the spectral energy distribution indicator, and the energy level of the input melody. The process of matching the input melody with songs in the music database is based on minimizing a cost computation that takes into account errors in the insertion and deletion of notes, and penalizes these errors in accordance with the confidence levels of the breakpoints and / or notes.

An apparatus calculates a number of spectral envelopes to be derived by a spectral band replication (SBR) encoder, wherein the SBR encoder is adapted to encode an audio signal using a plurality of sample values within a predetermined number of subsequent time portions in an SBR frame extending from an initial time to a final time, the predetermined number of subsequent time portions being arranged in a time sequence given by the audio signal. The apparatus has a decision value calculator for determining a decision value, the decision value measuring a deviation in spectral energy distributions of a pair of neighboring time portions. The apparatus further has a detector for detecting a violation of a threshold by the decision value and a processor for determining a first envelope border between the pair of neighboring time portions when the violation of the threshold is detected.

The invention provides conspicuity devices and methods. A first embodiment includes a tool band and an electroluminescent lamp adapted and configured to admit light having an advantageous spectral energy distribution. The device can have many additional and / or alternative passive and / or active conspicuity features, such as lasers, lamps, photoluminescent and retroreflective materials, among others.

The invention discloses a method for quickly calculating the dominant wavelength in the measurement of colorimetric parameters of a light-emitting diode (LED), which consists of a sectionalized judgment algorithm and a variable step size inquiry algorithm. The method is to acquire relative spectral energy distribution curve data P(lambda[i]) of the LED to be measured through a sensitimeter (CCD) of a spectrograph, calculate the chromaticity coordinate of the LED according to the color matching function of CIE 19312 degree *(lambda), *(lambda), *(lambda), take equal-energy white light WE(xe=0.3333, ye=0.3333) as a reference light source, sectionalize data with the wavelength range between 360 and 780 nanometers in a CIE1931 chromaticity diagram, judge the section with the dominant wavelength according to the chromaticity coordinate, and quickly calculate the dominant wavelength of radiant light of the LED to be measured by the variable step size inquiry algorithm, wherein the precision is 1 nanometer. The method reduces the calculation of the dominant wavelength, improves the working efficiency, and is used for the online measurement and the separation of the colorimetric parameters of the LED.

A music retrieval system which take an input melody as the query. In one embodiment, changes or differences in the distribution of energy across the frequency spectrum over time are used to find breakpoints in the input melody in order to separate it into distinct notes. In another embodiment the breakpoints are identified based on changes in pitch over time. A confidence level is preferably associated with each breakpoint and / or note extracted from the input melody. The confidence level is based on one or more of: changes in pitch, absolute values of a spectral energy distribution indicator, relative values of the spectral energy distribution indicator, and the energy level of the input melody. The process of matching the input melody with songs in the music database is based on minimizing a cost computation that takes into account errors in the insertion and deletion of notes, and penalizes these errors in accordance with the confidence levels of the breakpoints and / or notes.

The invention provides conspicuity devices and methods. A first embodiment includes a tool band and an elongate lighting device adapted and configured to admit light having an advantageous spectral energy distribution. The device can have many additional and / or alternative passive and / or active conspicuity features, such as lasers, lamps, photoluminescent and retroreflective materials, among others.

The invention provides a light conversion enhanced photocatalysis composite material and a preparation method thereof. The light conversion enhanced photocatalysis composite material is prepared according to the main principle that: a photocatalysis film layer is further compounded on the surface of a transparent infrared conversion core layer by adopting a physical-chemical method, the photocatalysis response spectral intensity of the photocatalysis material is remarkably enhanced by utilizing the control function of a transparent infrared conversion light film layer to the solar incident light spectrum energy distribution and an efficiency coupling energy transfer function between the transparent infrared conversion light film layer and the photocatalysis film layer, and the photon conversion efficiency and the solar utilization efficiency of the photocatalysis material are improved. The novel light conversion enhanced photocatalysis composite material has the advantages of compact structure, stable property, high photon conversion efficiency and the like, can adapt to different solar illumination conditions, can be used for fully converting and utilizing solar energy, and has potential application to the fields of direct catalysis decomposition on pure water to produce hydrogen by solar light, photocatalytic degradation to organic pollutants, organism photosynthesis and thelike.

The disclosure provides conspicuity devices and methods. A first embodiment includes a glove with at least one elongate lighting device adapted and configured to admit light having an advantageous spectral energy distribution. Additional articles of clothing are provided herein for enhanced conspicuity, such as for emergency workers and athletes.

The invention relates to a continuous spectrum light source comprising a stabilized voltage power supply, a light source, an optical fiber light source set, an optical fiber coupling lens set, and an output optical fiber. The optical fiber light source set is composed of N light spectrum channels with different wavelength coverage. Each light spectrum channel comprises orderly arranged component of a collimating lens, a band pass filter, a coupling lens, and an optical fiber. Light energies from the light source pass the collimating lens, such that parallel lights are formed; when the parallel lights pass the band pass filter, light energies with wavelengths within a range of (lambda1<(j)>, lambda2<(j)>) enter the optical fiber through the coupling lens. Optical fibers of the N light spectrum channels form an optical fiber bundle. The light energies are coupled into the output optical fiber through the optical fiber coupling lens set. Through the adjustment of light energy distribution in each light spectrum channel of the optical fiber light source set, the balance of the light energies output by the output optical fiber within an entire spectral range can be realized, such that a continuous spectrum light source is composed. Or, according to a spectrum energy distribution requirement, optical coupling efficiency of each spectrum channel of the optical fiber light source set can be adjusted, such that light energies can be arbitrarily distributed according to wavelengths.

The invention is applied to the technical field of illumination, and provides a light source color rendering performance spectrum diagnosis method and system. The method comprises the following steps: calculating a color rendering index of light source spectrum energy distribution; extracting a monochromatic spectrum in the light source spectrum energy distribution, adding equal-energy white light, and drawing a spectral purity curve on a chromaticity diagram so as to form a spectrum color domain area; calculating a spectrum color domain area index, and evaluating a deletion condition of the spectrum; determining a deletion position needing to be added to the spectrum through combination with the spectrum color domain area and the deletion condition of the spectrum; according to a spectrum main wavelength and a peak value wavelength, determining a needed peak value wavelength spectrum; and determining a proportion needing to be added to a deletion portion spectrum, obtaining a generation light source spectrum and calculating a color rendering index so as to realize diagnosis of the spectrum. According to the invention, physical quantity based spectrum energy distribution is converted into a vision-based spectrum color domain area, visual determination can be carried out, the color rendering performance can be improved, and a spectrum problem can be accurately diagnosed.

The invention relates to the LED domain, especially to a LED unit containing fluorescent powder of alkaline earth borophosphate. The LED unit of this invention consists of violet LED grain and rare-earth phosphor, in which the said rare-earth phosphor is alkaline earth borophosphate with a chemical composition expression of (Sr1-xEu2+x)6BmPnO20,0x=0.2,0m1.5, 4.5n5.5 and the said violet LED grain is inorganic semiconductor LED grain of GaN base in which the emitted near ultraviolet lights lie in area between 330nm and 420nm receiving priority in area between 350nm and 410nm. The said alkaline earth borophosphate can be added with other fluorescent powder to constitute bi-component rare-earth phosphor or tri-component rare-earth phosphor to prepare white LED unit. The LED unit of this invention is of high stability and good compatibility, suitable for batch process, and can be used in display and decorative lighting area. The packed white LED unit is of reasonable spectral energy distribution, which can make up for shortcomings of low color index of white light of traditional white LED unit, and has high color index.

The invention discloses a spectral envelope silence detection method. The method comprises the following steps: converting a time domain signal into a frequency domain signal and calculating the spectral energy distribution of the signal; performing gain oscillation detection on a received signal according to the state of the received signal, and updating the spectral energy distribution of a background noise by selecting a corresponding updating mode according to the current state; calculating the signal-to-noise ratio of a frame by utilizing the spectral energy distribution of the received signal and the spectral energy distribution of the background noise, and storing the signal-to-noise ratio of the frame within a certain recent period of time; performing spectral envelope multi-shift according to the records of the signal-to-noise ratio of the frame and the signal-to-noise ratio of spectral envelope, and judging an input signal is a voice or a noise according to the state output of the state shift. By the method, the starting and the ending of a voice signal can be detected quickly, and basis can be provided for processing voice signals such as voice noise reduction and voice silence.

The invention relates to a flue gas analysis device based on an ultraviolet difference technology, and a flue gas analysis method. The flue gas analysis device sequentially comprises an ultraviolet light source, a measuring cell, an optical fiber and a spectrograph, wherein a focusing lens and an optical fiber connection adjustment mechanism are arranged at the end, close to the optical fiber, of the measuring cell; the optical fiber connection adjustment mechanism is used for adjusting the front and back translation, relative to the measuring cell, of a longitudinal end face of the optical fiber so as to utilize the axial chromatic aberration of the focusing lens to enable ultraviolet light emitted by the ultraviolet light source to couple different spectral energy distributions in the optical fiber, thus obtaining the position of the longitudinal end face of the optical fiber with the maximum spectral energy distribution at the absorption wavelengths of all flue gas components by means of multiple adjustments during detection, improving the signal to noise ratio and enhancing the detection sensitivity of concentrations of all the flue gas components. The device and the method can adapt to detection of different sample gases to be detected.

A method (1100, 1200) of generating a composite mitigation signal (216, 902, 1002) is presented. The composite mitigation signal includes an odd integer (N) of transitions (310, 312) between a first amplitude and a second amplitude of the composite mitigation signal. Successive sets of the transition bursts are separated by a desired phase delay or time delay (330), or such separations are defined by a base signal (416) having a frequency equal to a fundamental frequency of the composite mitigation signal. The composite signal generators (222, 900, 1000) that generate the composite mitigation signal are also presented.

The invention provides a color measurement apparatus. The color measurement apparatus comprises an integrating sphere, an illumination apparatus and an optical measurement apparatus, and is characterized in that the illumination apparatus comprises one or more halogen tungsten lamp illumination units taking halogen tungsten lamps as light emitting sources and one or more LED illumination units taking LED light sources as light emitting sources. The spherical wall of the integrating sphere is provided with one or more illumination windows, and light emitted from the halogen tungsten lamp illumination units and the LED illumination units is incident to the integrating sphere through the same illumination window or different illumination windows. According to the invention, through combining the LED light sources with the halogen tungsten lamps, a spectrum from within an UV scope to an infrared large-wave-band scope is enabled to have sufficient spectral energy distribution, spectrum structure design of illumination light is also facilitated, the spectrum demands for color measurement of various samples are greatly satisfied, and the color measurement apparatus has the advantages of simple operation, flexibility, adjustability and low loss.

Provided is a light-emitting diode light source simulation system. Different kinds of light sources including spectral energy distribution of a light-emitting diode are prestored in a system database. The system can design a special light source expressed by the spectral energy distribution and provides a manufacture prescription of the special light source. The special light source comprises known spectral energy distribution, and is a target light source, a light source capable of achieving one or multiple quality indexes (including luminous effect indexes, standard color temperature and color difference, metamerism color, color rendering index, color gamut area index and the like) or a light source capable of achieving the effect that one motion of a user can be promoted by means of the special color rendering index light source designed by the system.

The present invention discloses a LED lamp based on a multi-layer remote phosphor film. The lamp comprises a LED light source, a structure piece, a light-permeable medium and a phosphor film. The phosphor film is a multi-layer structure, and the properties of each layer of phosphor are different. After the light emitted by the LED light source passes through the multi-layer phosphor film, photons excite the phosphor with different properties to generate the photons with different wave lengths, and the other parts of the photons have no change of the wavelength through passing through the phosphor layer. The mixture with appropriate proportion of the photons with different wavelengths generates the light required by the final production of the LED lamp. Through controlling the materials, the ratio, the thickness, the number of layers and the combination modes of the phosphor film, the LED lamp based on multi-layer remote phosphor film realize the integral control of the LED lamp spectrum energy distribution by combining the combination of different LED chips and the driving current of the chip in the LED light source.

The invention discloses a color temperature adjusting method based on screen brightness and a color temperature adjusting device thereof and equipment. The method comprises the steps that the current screen brightness after performing blue light filtering operation on the screen is detected; and the RGB spectral energy reconstruction proportion corresponding to the current screen brightness and the target color temperature required to be met is determined according to RGB spectral energy distribution information learnt in advance, and the RGB spectral energy of the screen is adjusted according to the RGB spectral energy reconstruction proportion so that the RGB spectral energy of the energy after blue light filtering operation is enabled to meet the target color temperature. Therefore, the color temperature and the corresponding screen brightness are correspondingly set so that drift of the color temperature can be avoided, the adjusting effect of the color temperature is enabled to meet the user expectation and the visual experience of the user can be enhanced.

The invention provides an analogy method capable of automatically calibrating light sources with spectrums capable of being adjusted continuously and a device of the method. The device comprises at least two integrating spheres different in radius. Each integrating sphere is provided with the corresponding number of LED light sources according to the adjusting range of color temperature and star magnitude. The LED light sources arranged on the integrating spheres are driven by corresponding LED light source drivers. A light outlet of each integrating sphere is provided with a spectrum detection device used for detecting light beams in real time, and a star point plate used for converting the light beams into analog fixed-star point light sources. According to the method and the device, an expected color temperature value and a star magnitude value can be directly set, and corresponding stable spectral energy distribution diagrams can be obtained immediately.

The invention relates to a method for discriminating the microstructures of different plain laser master masks. A multi-angle spectrophotometer is used to measure the chroma information and the spectrum information of the fixed positions of the different plain laser master masks. The method comprises the following steps: fixing the laser master masks, rotating a color measuring device by every 5 DEG in a range of [0 DEG, 45 DEG], and sequentially recording the chromatic values L* values at a detection angle of 45 DEG; selecting one of the plain laser master masks as a standard master mask, and aligning the positions with the maximum L* value of the plain laser master masks to be compared with the position with the maximum L* value of the standard master mask; acquiring the spectrum information of any position of the standard master mask and the plain laser master masks to be compared; and combining a grating equation, acquiring the shapes and the peak wavelengths of the spectrum energy distribution curves of different plain laser master masks, comparing the shapes and the peak wavelengths, and determining, discriminating and comparing the microstructures of the different plain laser master masks. The method has the characteristics of convenience in operation, simplicity and fastness.

The invention discloses a method and device for monitoring laser spectrum and spectral energy distribution simultaneously. The method includes the steps that a light blocking system is used for enabling laser light with a specific spectral range in laser light to be monitored to be incident to a light splitting system, the light splitting system is used for splitting the laser light into two beams, one laser light beam is used for detecting and displaying the spectrum, the other laser light beam is used for conducting energy detection, the light blocking system is adjusted so as to change the spectral range of the laser light which passes through the light blocking system, and the spectral energy distribution of the laser light to be monitored is acquired according to the displayed spectral range and the energy corresponding to the displayed spectral range. The light blocking system can be formed by adjustable slits with the sizes and the positions of openings capable of being adjusted. According to the method and device for monitoring the laser spectrum and the spectral energy distribution simultaneously, the laser spectrum and the corresponding energy distribution of the incident laser light can be observed simultaneously, simpleness and rapidness are achieved, operation is convenient, and reliability is high.

An implantable medical device provides atrial arrhythmia prevention pacing when an interatrial conduction disturbance is detected. The implantable medical device includes a signal processor that detects the interatrial conduction disturbance and a pulse generator circuit coupled to the detector that delivers the atrial arrhythmia prevention pacing pulses to the heart when the processor detects the interatrial conduction disturbance. The interatrial conduction disturbance may be a P-wave duration, a difference between odd and even P-waves, or a predetermined P-wave spectral energy distribution.

The invention discloses an LED wafer test method for stabilizing spectral energy distribution. When a non-first LED unit in a first edge area of a row of LED units is measured, the integration time ofat least one preceding LED unit of the non-first LED unit is taken as a reference. When a LED unit of a second edge is measured, the integration time of the LED unit is calculated directly based on the INT value proportion of the LED unit to the LED unit in a parameter-stable middle area, so that the integration time changes continuously from the edge to the middle area during the test, the spectral energy distribution of the LED unit in the edge area is consistent with that of the LED unit in the middle area, good spectral characteristics are presented, and the fluctuation problem of the spectral energy in the measurement process in the prior art is solved.