220 results about "Spectrum shaping" patented technology

An audio signal decoder includes a transform domain path configured to obtain a time-domain representation of a portion of an audio content on the basis of a first set of spectral coefficients, a representation of an aliasing-cancellation stimulus signal and a plurality of linear-prediction-domain parameters. The transform domain path applies a spectrum shaping to the first set of spectral coefficients to obtain a spectrally-shaped version thereof. The transform domain path obtains a time-domain representation of the audio content on the basis of the spectrally-shaped version of the first set of spectral coefficients. The transform domain path includes an aliasing-cancellation stimulus filter to filter the aliasing-cancellation stimulus signal in dependence on at least a subset of the linear-prediction-domain parameters. The transform domain path also includes a combiner configured to combine the time-domain representation of the audio content with an aliasing-cancellation synthesis signal to obtain an aliasing reduced time-domain signal.

According to one embodiment of the invention, an integrated circuit comprises an encoding module, a modulation module and a spectral shaped module. The encoding module includes an interleaver that adapted to operate in a plurality of modes including a first mode, a second mod and a third mode. The interleaver performs repetitive encoding when placed in the second mode and even greater repetitive encoding when placed in the third mode.

A display device capable of early finding a sign such as misregistration or width variation of an emission layer formed by a layer transfer method, and a manufacturing method of the same are provided. In an inspection region 150 outside of an effective region 110, inspection pixels Px2 made up of organic light-emitting elements 10R, 10G and 10B are provided, and a distance W2 between the inspection pixels Px2 on both sides of a color targeted for inspection is shorter than a distance W1 between display pixels Px1 on both sides of the color targeted for inspection. Based on a change in a chromaticity or a spectrum shape of EL or PL light emission of the inspection pixel Px2, a sign such as misregistration of a red-light emission layer 15CR, a green-light emission layer 15CG, is found at an early stage.

According to one embodiment of the invention, an integrated circuit comprises an encoding module, a modulation module and a spectral shaped module. The encoding module includes an interleaver that adapted to operate in a plurality of modes including a first mode and a second mode. The interleaver performs repetitive encoding when placed in the second mode. The modulation module is adapted to compensate for attenuations that are to be realized during propagation of a transmitted signal over the power line. The spectral shaped module is adapted to compensate for amplitude distortion and further compensates for attenuations that will be realized during propagation of the transmitted signal over the power line.

A method for overcoming the drawback in a fiber CPA laser system that includes a process of generating a large negative TOD by implementing an AODS in a pulse shaper as a dispersive component. The AODS is implemented to arbitrarily modulate both the spectrum shape and phase to control with controllable amplitude to generate different orders of dispersions including a large negative TOD for compensating the positive TOD generated by the pulse stretching and amplification processes. The AODS, implemented as a dispersive component, can be an active and controllable dispersive component to generate adjustable levels of dispersions for flexibly compensating any order of dispersions generated in the amplifier chain including the nonlinear phase shift. The AODS implemented as a dispersive component can be an active and programmable dispersive component to interactively generate adjustable levels of dispersions in response to output laser amplitude and pulse shape measurements for flexibly compensating any order of dispersions generated in the amplifier chain including the nonlinear phase shift to achieve the shortest pulse duration.

A green phosphor for emitting light, a spectrum of which is sharp, in an ultraviolet and visible light region, which has higher green light brightness than the conventional rare earth-activated sialon phosphor and has higher durability than the conventional oxide phosphor, is provided. The phosphor being characterized in that Al and a metal element M (here, M is Eu) are incorporated into a crystal of a nitride or oxynitride having a βSi3N4 crystal structure as a solid solution, the content of oxygen in the crystal does not exceed 0.8% by mass, and that the phosphor emits a visible light having a luminescence peak wavelength in the range of 450 nm to 650 nm upon exposure to an excitation source is provided. This luminescence spectrum has a sharp spectrum shape. A manufacturing method of the phosphor, a lighting device and an image display device utilizing the phosphor are also provided.

According to one embodiment of the invention, an integrated circuit comprises an encoding module, a modulation module and a spectral shaped module. The encoding module includes an interleaver that adapted to operate in a plurality of modes including a first mode, a second mod and a third mode. The interleaver performs repetitive encoding when placed in the second mode and even greater repetitive encoding when placed in the third mode.

An orthogonal frequency division multiplexing (OFDM) signal spectrum shaping device comprises an input interface configured to receive an input signal, a modulation portion coupled to the input interface, configured to modulate the input signal to generate a plurality of uncompensated sub-carriers, and a sub-carrier gain control module configured to selectively apply a plurality of gain factors to the plurality of uncompensated sub-carriers to generate a plurality of compensated sub-carriers that are substantially equal in amplitude.

A Doppler sensitivity measuring unit measures the Doppler sensitivity of Doppler spectrum data obtained by ultrasonic wave transmission / reception with respect to a predetermined region of an object to be examined. A spectrum shape model generating unit generates a spectrum shape model on the basis of a window function used when the above Doppler spectrum data is generated. A threshold setting unit sets a threshold range in which trace waveform data displaces by a predetermined amount in the frequency axis direction on the basis of the spectrum shape model and the Doppler sensitivity, and sets a predetermined number of thresholds at almost equal intervals in the threshold range. A trace data generating unit selects a threshold for the acquisition of desired trace waveform data by generating trace waveform data while sequentially updating the plurality of set thresholds.

An audio signal decoder includes a transform domain path configured to obtain a time-domain representation of a portion of an audio content on the basis of a first set of spectral coefficients, a representation of an aliasing-cancellation stimulus signal and a plurality of linear-prediction-domain parameters. The transform domain path applies a spectrum shaping to the first set of spectral coefficients to obtain a spectrally-shaped version thereof. The transform domain path obtains a time-domain representation of the audio content on the basis of the spectrally-shaped version of the first set of spectral coefficients. The transform domain path includes an aliasing-cancellation stimulus filter to filter the aliasing-cancellation stimulus signal in dependence on at least a subset of the linear-prediction-domain parameters. The transform domain path also includes a combiner configured to combine the time-domain representation of the audio content with an aliasing-cancellation synthesis signal to obtain an aliasing reduced time-domain signal.

A green phosphor for emitting light, a spectrum of which is sharp, in an ultraviolet and visible light region, which has higher green light brightness than the conventional rare earth-activated sialon phosphor and has higher durability than the conventional oxide phosphor, is provided. The phosphor being characterized in that Al and a metal element M (here, M is Eu) are incorporated into a crystal of a nitride or oxynitride having a β-type Si3N4 crystal structure as a solid solution, the content of oxygen in the crystal does not exceed 0.8% by mass, and the phosphor emits a visible light having a luminescence peak wavelength in the range of 450 nm to 650 nm upon exposure to an excitation source is provided. This luminescence spectrum has a sharp spectrum shape. A manufacturing method of the phosphor, a lighting device and an image display device utilizing the phosphor are also provided.

The present invention relates to the optical coherent tomographic (OCT) imaging technology. Technologically, the present invention features that longitudinal resolution of OCT is raised through either utilziing dispersive element or blocking element to change the spectrum shape of input light source or utilizing one blocking element to change the spectrum shape of reference arm returned light. The present invention may be used for the OCT system with femoto second-level laser or SLD light source. The method is simple and may be used to raise the longitudinal resolution of OCT system for 20 microsecond to 14 microsecond.

The present invention relates to a chirp pulse amplifying spectrum shaping dielectric film structure reflector, which comprises a transparent substrate, a high reflectance film system, an anaglyph structure and an external protective layer. Wherein, the high reflectance film system is composed of a plurality of staggered dielectric films. A high reflectance film layer and a lower reflectance film layer of the high reflectance film closely contact the anaglyph structure. The anaglyph structure can take a plurality of shapes, such as a micro-lens high transparency film system structure, an air dielectric structure, a glass anaglyph structure or other transparent dielectric structures, including semiconductor structures. As a high-power laser chirp pulse with a plane wave structure vertically casts onto the reflector, the laser passes through the high reflectance film system and the anaglyph structure and all residual lasers are reflected to back of the reflector through the transparent substrate. Reflex intensity distribution is modulated to a needed spectrum distribution structure. The reflector of the present invention can be inserted into any place of an amplifier link and improve capacity to distinguish shaping spectrum chromatic dispersion to a certain level. Scope modulation exceeds 60% without changing phase position, thus adapting to PW devices.

The invention discloses a fiber grating arrays- fiber delay line based light pulse reshaper and a shaping method thereof. The reshaper comprises a amplitude controller composed of a first coupler, a second coupler, a first circulator, a first fiber grating array and a fiber delay line, as well as a phase controller composed of a second circulator and a second fiber grating array, wherein the amplitude controller is used for realizing the functions of selecting wavelength and controlling spectral line amplitude; the phase controller is used for realizing functions of selecting wavelength and controlling spectral line phase; each fiber grating array is composed of an optical fiber bragg grating and a fiber tensioner; all-optical arbitrary waveform output is realized through spectrum shaping of an optical frequency comb; the adjustment for amplitude and phase position of different spectral lines of an input optical frequency comb can be realized through adjusting the fiber tensioners in the two fiber grating arrays, so as to obtain the output of light pulse in required waveforms. According to the invention, collimation control is not required, the structure is simple and the realization is easy.

The invention discloses a debugging device and a method based on a chirped management laser; the method comprises the following steps: modulation signals produced by an optical domain are converted into electric-domain signals for modulating the laser; the received command signals are converted into simulating control signals for controlling the working state of the laser, and bias current of the laser, tube core temperature and radio-frequency voltage of AC coupling are set according to the simulating control signals; by comparison, if extinction ratio is not in the required range or is not in accordance with the presetting standard of an eye pattern, the temperature of a spectrum shaping element is adjusted. Compared with the prior art by repeatedly debugging according to the loss of the filter, the steps of the method is less, the debugging procedure is obviously simplified, thus improving the debugging efficiency; the debugging device only adopts a radio-frequency voltage amplitude control unit, a temperature control, a bias current control unit and a laser tube core temperature control unit for carrying out debugging, thus simplifying debugging procedure and improving the debugging efficiency.

The invention discloses a time division multiplexing (TDM)-based low-reflectivity triangle spectrum-shaped fiber grating sensing system. The system mainly comprises a distribution feedback laser, an electro-optical modulator, a circulator, an optical amplifier, a triangle spectrum-shaped fiber grating sensor, a high-speed optical detector, a pulse signal generator and a signal acquisition device, wherein the distribution feedback laser is used for emitting narrow line-width laser; pulse signal light is formed by the narrow line-width laser through the electro-optical modulator or is generated by internal modulation through the distribution feedback laser; the pulse light passes through the circulator and then is reflected by a triangle spectrum-shaped fiber grating; the reflected light passes through the circulator to enter the optical amplifier and is amplified into the high-speed optical detector; and a light signal is converted into an electrical signal through the high-speed optical detector, and the electrical signal is converted into a digital signal and is processed through the signal acquisition device. In the system, the distribution feedback laser and the low-reflectivity triangle spectrum-shaped fiber grating sensor are combined, a large-scale fiber grating sensing network is constructed through TDM, and thousands of sensors are multiplexed on a single fiber, so that the costs of a light source and a wavelength detection device are reduced.

Clock signal jitter detection circuit for detecting a clock signal jitter in a reference clock signal (CLK), having a switched-capacitor reference digital-analogue converter (15) which is clocked by the reference clock signal (CLK) and which converts a digital input signal into a first current, a current-controlled digital-analogue converter (16) which is clocked by the reference clock signal (CLK) and which converts the digital input signal into a second current, and having a current integrator (18) which integrates the difference between the first current and the second current to produce a signal which indicates the clock signal jitter in the reference clock signal (CLK).

A method and a device for spectrally shaping nonlinear intersymbol interference (NLISI) in an oversampling digital-to-analog converter are disclosed. At least one higher-order shaper circuit is provided, so as to shape NLISI, causing energy associated with NLISI to fall outside a signal band. The signal-to-noise ratio achieved is better than signal-to-noise rations obtained in prior art NLISI reducing methods and devices.

Disclosed is a method for speech recognition which achieves a high recognition rate. The method includes extracting a parameter from an input signal that represents a characterization of the input signal as a voiced or unvoiced sound, extracting at least one feature vector corresponding to an overall spectrum shape of a voice from an input signal, and using the extracted parameter and extracted feature vectors in a training phase and in a recognition phase to recognize speech.

There is being disclosed an OFDM signal receiver for detecting carrier frequency offset. When FFT transform of the signal is processed in the receiver, an estimator applies the spectrum shape of the FFT transform for estimating the carrier frequency offset.

It is a light spectrum shaping apparatus and its method, which uses attenuated total reflectance property and electro-optical property of the reflection electro-optical modulator to realize the light spectrum shaping of ultra-short laser impulse. The apparatus comprises the reflection electro-optical modulator, adjustable direct power, tray disc, laser in the incidence light path, polarimeter, the electro-optical detector in the optics hole and reflection light path and optical spectrometer. The reflection electro-optical modulator composed of the prism and four layers of thin films deposited on the prism is fixed in the center of the rotation disc, The organic polymer wave-guiding layer of the modulator has electro-optical effect through corona discharge electrode. Through altering the incidence angle, it selects the attenuated total reflectance curve with matching width of light spectrum with the laser spectrum from the multiple attenuated total reflectance curves and adjusts the voltage exerted between the upper and down electrodes of the modulator of the adjustable direct power to get the ideal shaping spectrum.

The invention relates to a spectral shaping device and a method of a chirp widening laser pulse. The spectral shaping device comprises a mode-locked laser, a raster stretcher, a lens, a pulse sample, an optical fiber splitter, an optical amplifier, a synchronous photoelectric converter, a shaping electrical pulse generator and an integrated guided-wave electro-optical modulator. The invention can perform the spectral pre-shaping of the chirp widening laser pulse before amplification, thus greatly decreasing gain narrowing effect in a chirp pulse amplification system. The spectral shaping device does not need complex light paths and machinery and spectral shape is easy to be changed. In addition, the spectral shaping device has flexible operation and high efficiency and is easy to be embedded into the multi-stage amplification system of the chirp pulse.

A broadband digital communication network transmits a signal with a shaped power spectrum to minimize interference with devices that share the communication medium. In one embodiment using coaxial wiring, devices such as cable converters and televisions that are not part of the network share the communication medium and are exposed to the network signal. Power levels across the network band are selected to reduce interference in the non-networked devices. One area of susceptibility is the tuner of cable channel receivers, which perform mixing and down conversion of RF signals. The power spectrum profile is selected to minimize the IF and base band interference after down conversion. The spectrum can be shaped within each 6 MHz band to further minimize the interference with a TV signal. The power levels can be optimized for both peak power limitation and quantization effects.

An actinium-227 production device having a plurality of metallic or ceramic caplets, each enclosing a radium-226 compound in redundantly nested sealed cylinders. The radium-226 compound is compacted into a disk and diluted with heat transporting ceramic materials. A thermal neutron shield including spectrum shaping materials to protect actinium-227 produced from exposure to thermal neutrons is included along with a strong neutron absorber to shape the neutron spectrum such that radium-226 nuclei are exposed to neutrons in the higher epithermal energy groups upon entry into the target with an energy of between 20 eV and 1 KeV.

System and methods for producing a plurality of Sinc shaped pulses in the time domain include a light source for providing an input light signal having an input frequency, and at least one spectrum shaper for producing the plurality of Sinc shaped pulses from the input light signal. The spectrum shaper may include an amplitude modulator, at least one radio-frequency generator and a bias voltage generator.

A method for treating an eye condition of a user using at least one light source, the at least one light source having an output which is adjustable in at least one of spectrum shape, intensity, or duration, the method comprising: (a) obtaining information relating to an eye condition of the user; (b) determining a dose of light to treat the eye condition, the dose including one or more of a particular spectrum shape, a particular intensity, or a particular duration; and (c) causing the at least one light source to adjust the output to deliver the dose.

The embodiment of the present invention proposes a broadband intermediate frequency design method, including: performing unified phase rotation on the physical layer of the multi-carrier signals of the first frequency band and the second frequency band, and after completing DUC spectrum shaping and spectrum shifting, the two frequency bands Signal superposition; perform CFR peak clipping operation on the superimposed multi-carrier signals of the first frequency band and the second frequency band; perform DPD digital pre-distortion processing on the signal after peak clipping. The present invention also proposes a broadband intermediate frequency design device, including: a signal superposition module, a peak clipping module and a predistortion module. According to the method and device provided by the embodiments of the present invention, the F+A frequency band can be implemented on existing products and the requirements for hardware programmable chips are minimized. The CFR effect is relatively obvious, and the RF link structure is simple due to the adoption of the ZIF scheme or the separate sampling of the I / Q channels.

The invention provides a high-power broadband ASE (Amplified Spontaneous Emission) light source in 1064 nm waveband, comprising a beam combiner, a section of YDF (Ytterbium Doped Fiber), an optical isolator, a fiber end cap, a semiconductor pump laser and a section of YDF in certain length. The invention is characterized in that: a light output end only needs to be welded with a small section of YDF in non-pumping state, the secondary absorption effect of the YDF on ASE optical signals is utilized, and an ASE spectrum shape is effectively processed and flatly outputted. An optical path box in which the YDF is wound is arranged on a temperature-controllable simple heating plate, the working temperature of the YDF is adjusted and controlled, the ASE spectrum shape is further outputted flatly, and the ASE light output spectrum bandwidth is effectively improved. Besides, in the non-output direction, the fiber end cap based on small-section multimode fiber grinding and coating manner is welded for restraining the light reflection on the end surface of the fiber, the laser output formed by self-oscillation is avoided, the pumping power is ensured to be improved, and meanwhile, the scale of ASE light output power is effectively improved.