47results about How to "High modulation" patented technology

An antiglare antireflective film is provided and includes: a transparent substrate; and at least one layer. The antiglare antireflective film having a surface having asperities in which: 15% to 70% of the total asperities are asperities, each having a tilt angle of 1° or below, which a line normal to each asperity profile form with a line normal to the transparent substrate; and at most 3% of the total asperities are asperities, each having the tilt angle of 10° or above.

In an electro-optic device, a stack structure including a first silicon layer of a first conductivity type and a second silicon layer of a second conductivity type has a rib waveguide shape so as to form an optical confinement area, and a slab portion of a rib waveguide includes an area to which a metal electrode is connected. The slab portion in the area to which the metal electrode is connected is thicker than a surrounding slab portion. The area to which the metal electrode is connected is set so that a range of a distance from the rib waveguide to the area to which the metal electrode is connected is such that when the distance is changed, an effective refractive index of the rib waveguide in a zeroth-order mode does not change.

To provide transmission and reception diversity schemes for a powerful, flexible and less complex bandwidth-efficient space-time modulation scheme there is proposed a method of and apparatus for differential multiple-norm space-time transmit diversity from a unitary space-time modulation scheme using at least two transmit antennas. In a first step a group of transmission bits is divided into a first sub-group of transmission bits and a second sub-group of transmission bits. In a second step the first sub-group of transmission bits is mapped onto a constellation matrix of a differential unitary space-time modulation scheme. In a third step a scaling factor is determined from the second sub-group of transmission bits. In a fourth step a transmission matrix is sep up through differential encoding of the constellation matrix and a previously determined transmission matrix in combination with scaling by the scaling factor. The differential multiple-norm transmit diversity according to the present invention improves distance properties of the modulation scheme which are relevant for achievable error rates and extends higher order modulation also to the area of differential transmit diversity schemes from unitary designs.

In an electro-optic device, a stack structure including a first silicon layer of a first conductivity type and a second silicon layer of a second conductivity type has a rib waveguide shape so as to form an optical confinement area, and a slab portion of a rib waveguide includes an area to which a metal electrode is connected. The slab portion in the area to which the metal electrode is connected is thicker than a surrounding slab portion. The area to which the metal electrode is connected is set so that a range of a distance from the rib waveguide to the area to which the metal electrode is connected is such that when the distance is changed, an effective refractive index of the rib waveguide in a zeroth-order mode does not change.

The present disclosure relates to a device for modulating light emitted by a laser, including an optical substrate that has an electro-optical effect, at least one optical waveguide formed near a front face of the optical substrate, a first electrode that is formed with a conductive transparent film so that a part of the optical waveguide may be covered and is used for applying an electric field to the optical waveguide, a second electrode that is paired with the first electrode and is used for applying an electric field to the optical waveguide, and a third electrode that is formed with a metal film in a position that is shifted from a position just above the optical waveguide and is electrically connected with the first electrode.

The invention discloses a high-dynamic-range grating projection three-dimensional measurement method based on full-automatic exposure, and the method comprises the steps: collecting a grating projected by a projector through a camera, wherein the exposure time is an initial value t1 at this moment; calculating a stripe modulation degree coefficient I' of the collected image; solving a modulation degree threshold value I't according to a noise level curve of the camera; calculating a group of exposure moments (N) required by the whole measurement process according to a threshold value; automatically carrying out the photographing of N groups of grating stripes according to the obtained N exposure moments; solving N phase diagrams through the N groups of stripe patterns via a conventional phase shift algorithm; dividing all pixels of an original image into N groups according to the stripe modulation degree coefficient I', wherein the impact on the phases of all pixels in the i-th group in the i-th phase diagram from noise is smaller; synthesizing N phase diagrams into a final phase diagram according to the rule, and solving the three-dimensional information with the high dynamic range of an object through combining with the calibration information.

The invention relates to a modular multilevel converter and a hybrid double-unit sub-module. The modular multilevel converter comprises six bridge arms in three phases; n sub-modules are cascaded together so as to form each bridge arm, wherein at least one sub-module is a hybrid double-unit sub-module; the hybrid double-unit sub-module includes four power modules T1, T2, T3 and T4 and two capacitors C1 and C2; the anode of T1 is connected with the anode of T4; the cathode of T2 is connected with the cathode of T3; the cathode of T1 connected with the anode of T2; the cathode of the T4 is connected with the anode of T3 through the capacitor C2; the capacitor C1 is connected between the joint point of T1 and T4 and the joint point of T2 and T3; the joint point of T1 and T2 is one port of the hybrid double-unit sub-module; and the joint point of T2 and T4 is the other port of the hybrid double-unit sub-module. The hybrid double-unit sub-module can simultaneously replace two half-bridge sub-modules, and has negative voltage characteristics of a full-bridge sub-module. With the hybrid double-unit sub-module adopted, the utilization rate of direct voltage can be improved, and the capacity of a system can be improved.

There is described an RF bidirectional communication device utilizing active load modulation, the device comprising (a) a resonance circuit including an antenna (326), and (b) a control unit (322) for controlling communication of the device, including switching between a transmission mode and a receiving mode, wherein the control unit is adapted to (c) modify a configuration of the resonance circuit such that the resonance circuit has a first resonance frequency (f0) when the device is in the transmission mode and a second resonance frequency (f0+Δf) when the device is in the receiving mode, and (d) modify the configuration of the resonance circuit such that a Q-factor of the resonance circuit is periodically decreased while the device is in the transmission mode. There is also described a corresponding method and a system comprising a RF device and a reader / writer device. Furthermore, there is described a computer program and a computer program product.

The invention discloses a method for enhancing the broadband interference spectral resolution and a spectrograph. The method for enhancing the broadband interference spectral resolution comprises the steps that after dispersion is conducted on a broadband spectrum, continuous monochromatic spectrums are obtained; interference measurement is conducted on the monochromatic spectrums, so that monochromatic spectrum interferograms are obtained; resolution enhancement is conducted on each monochromatic spectrum interferogram so that the spectral resolution for spectrum reconstruction of each monochromatic spectrum interferogram can be improved. The broadband spectrum is changed into a series of narrowband spectrums, so that the interferogram modulation degree of each narrowband spectrum is improved; on the basis of the maximum optical path difference, the optimal path difference is further increased through the method for enhancing the interference spectral resolution, and therefore the spectrum with a higher resolution is obtained.

A flow-through rotary damper assembly providing highly efficient, essentially laminar fluid flow therethrough is provided. The rotary damper assembly includes a cylindrical outer body and a cylindrical inner body that are rotatable in relation to one another. The outer body defines apertures in relation to one another to allow fluid flow without requiring fluid direction change. The inner body defines a flow passage having inlet and outlet apertures that may be aligned with the apertures of the outer body to allow fluid flow therethrough, or may be rotated out of alignment to block fluid flow. The outer body includes an aperture on one end to allow fluid flow to a third compartment. The inner body also includes an end aperture that may be aligned therewith. The damper provides selectable fluid flow between each of the compartments depending on the relative position of the cylindrical inner body member.

Provided are an optical information playback device, an optical information playback method, and an information recording medium, by which, if the size of a recording area is smaller than the diffraction limit of light, information can be favorably playbacked. An optical information playback device comprises a light source (14) which emits playback lights, and a resonance unit (22) arranged closely to a recording area (4) of a recording layer (2), wherein the resonance unit (22) is provided with a plasmon resonance element (9) which generates plasmon resonance between the recording area (4) and the resonance unit (22), a photodetector (17a) which detects reflection lights or transmitted lights from the plasmon resonance element (9) to which the playback lights are irradiated, and a playback unit (24) which assesses whether the recording area (4); is in a recorded state or in an unrecorded state on the basis of the detection signal from the photodetector (17a) and playbacks the information recorded in the recording area (4).

Methods of operating a frequency-converted laser source are disclosed. According to particular disclosed embodiments, a laser diode is driven in a pulsed mode to define pixel intensity values corresponding to desired gray scale values of image pixels in an image plane of the laser source. The pixel intensity values are a function of a laser control signal comprising a discontinuous pulse component, a relatively constant intensity component I, and a continuously variable intensity component I*. The pulse width w of the discontinuous pulse component is selected from a set of discrete available pulse widths according to a desired pixel gray scale value. A low-end pulse width w of the set of available pulse widths is established for a range of low-end pixel gray scale values and progressively larger pulse widths w are established for ranges of progressively higher pixel gray scale values. The relatively constant intensity component I makes a relatively insignificant contribution to pixel intensity at the low-end pulse width w for the range of low-end pixel gray scale values and assumes a non-zero value for enhanced conversion efficiency at the progressively larger pulse widths w established for the higher pixel gray scale values. The continuously variable intensity component I* varies according to the desired gray scale value of the selected pixel and the contributions of the relatively constant intensity component I and the pulse width w to pixel intensity.

Embodiments of the present disclosure provide a single radio frequency double-stream transmission apparatus, wherein the apparatus includes: a radio frequency link, a reactance control circuit, a parasitic reactor, an active antenna and an even number M of parasitic antennas, wherein M is larger than 2; the radio frequency link is configured to generate a radio frequency signal; the active antenna is connected with the radio frequency link, the parasitic antennas are respectively connected with the parasitic reactor, the distances from the parasitic antennas to the active antenna are the same, and the radian between adjacent parasitic antennas is360Mdegrees;the parasitic reactor may be adjusted by the reactance control circuit to make the reactance values of any pair of parasitic antennas in mirror symmetry via the active antenna be different and the reactance values of the rest pairs of parasitic antennas in mirror symmetry via the active antenna be equal respectively.