174 results about "Field frequency" patented technology

There is provided a field-sequential color displaying method capable of reducing color breakup with respect to an optional image without greatly increasing a sub-field frequency. The field-sequential color display method includes; time-sequentially displaying of luminous information of an input image information with every display color and changing the display color in synchronism with the displaying of the luminous information in order to display the input image information, wherein one frame period in which one color image is displayed includes at least four sub-field periods in which information of each color is displayed, and a picture signal displayed in at least one sub-field period is a non-three-primary color picture signal which is generated from at least two primary color signals of input picture signals including three-primary color signals.

A dispensing system is disclosed which utilizes an electronically powered key device and/or identification code associated with a refill container to preclude the need for mechanical keys. The system utilizes a near field frequency response to determine whether a refill container is compatible with a dispensing system. In particular, the refill container is provided with a coil terminated by one of a number of capacitors. The container is received in a housing that provides a pair of coils that are in a spatial relationship with the installed refill container's coil. By energizing one of the housing's coils, the other coil detects a unique electronic signature generated by the container's coil. If the signature is acceptable, the dispensing system is allowed to dispense a quantity of material. The system also provides a unique latching mechanism to retain the container and ensure positioning of all the coils.

The present invention provides a recognition device and a method for the foreground depth position in a virtual broadcast studio system. The device comprises an assistant video camera arranged in a suitable position of the broadcast studio blue box and a real time image processing device, the assistant video camera output the image captured front the foreground of the blue box, the real time image processing device collects the image in a field frequency speed and processes the image, the characteristic data of the image is abstracted and then calculated and transferred, the location coordinate parameter of the foreground anchorperson or and object can be received, the device output the location coordinate parameter of the foreground to the three-dimensional color equipment of the virtual broadcast studio, the three-dimensional virtual scene and the depth position relationship of the real foreground can be matched with no seam after an equation matrix calculating, and the real foreground is merged into a suitable position of the three-dimensional virtual scene space, and reflects a correct occlusion relationship of the three-dimensional virtual scene.

The invention discloses a data table index set generation method. The method comprises the steps that statistical information of a data table to be analyzed in a database is scanned, and a field selective information table is updated according to the statistical information; SQL information used when an application program operates is collected from the database; the SQL information is analyzed to obtain field combination frequency of the SQL information to fields and/or combined fields of the data table to be analyzed, and the field combination frequency is updated into a combined field frequency table; the fields and/or the combined fields in the data table to be analyzed are optimized according to the combined field frequency table and the field selective information table to obtain the optimal data table index set corresponding to the data table to be analyzed. The invention further discloses a data table index set generation device.

The invention discloses a signal conversion method and device. According to the method, image data partition processing and field frequency multiplication processing are carried out on a low voltage differential signaling (LVDS) with low resolution and brush frequency output from a traditional image signal source to generate a signal applicable to dot screen test of a V-BY-ONE display module, and thus, the purpose of lighting the V-BY-ONE display modules with resolution of 4k, 8k and 10k, various different display Lane numbers and display screen modes by the existing image signal source is achieved. The device provided by the invention can be used for receiving external configuration through an upper-layer interface module, can be applicable to the V-BY-ONE modules with different resolutions, also can be suitable for the LVDS image signals input from various traditional image signal sources, and has the advantages of simplicity and convenience in operation; on the other hand, the device can be implemented by a field programmable gate array (FPGA) chip, and the technical scheme is flexible; and moreover, the device has the characteristics of relatively low cost and stable working performance.

The invention discloses a framework with wind electricity participating in system frequency modulation control. The framework comprises an operation managing layer, a wind electricity field control layer and a wind electricity unit control layer. The fact that the practical working conditions of units participating in frequency modulation in a wind electricity field are different is considered, wind electricity field frequency modulation economy is combined, the frequency modulation amplitude of the units is determined; meanwhile, a rotating speed recovery module is added, quick recovery of the rotating speed of a rotor is guaranteed, preparation is provided for next-stage system frequency modulation, and accordingly the wind electricity field can participate in frequency modulation like a conventional electricity field.

The invention discloses a display device and a control method of the display device, which relate to the technical field of 2D/3D (2 Dimensional/3 Dimensional) display. The device comprises a display panel and a phase modulation panel, wherein the display panel is used for displaying a 2D image in a 2D display mode, displaying a left eye image or a right eye image in a 3D display mode in the time of a first half frame of a frame and displaying the right eye image or the left eye image in the time of a second half frame; the phase modulation panel is arranged between the display panel and human eyes, and linearly polarized light transmitted by the display panel in the 2D mode is emitted out in a way of maintaining the polarization direction; and in the 3D display mode, according to the attributes of the image displayed by the display panel, the linearly polarized light transmitted by the display panel is subjected to phase modulation, and modulated light is transmitted. According to the display device, 2D/3D display without reducing the vertical resolution and the field frequency is carried out through the display panel adopting a pixel design with double grid lines and double data lines by combining the phase modulation panel which can be driven according to the attributes of the displayed images.

The invention provides a superpixel micro-scanning method and a corresponding infrared super-resolution real-time imaging device. The superpixel micro-scanning method includes that a paralleled plate rotates so that an image conducts a superpixel displacement D on an imaging plane of an infrared focal plane detector, and the displacement D is greater than a pixel space of the infrared focal plane detector. The corresponding infrared super-resolution real-time imaging device images an image on the corresponding infrared super-resolution real-time imaging device by an imaging lens, a variable speed rotating scanning structure is arranged between the imaging lens and the infrared focal plane detector, paralleled plates are arranged in the variable speed rotating scanning structure, the infrared focal plane detector is connected with an image processing and display circuit, the parallel plates always keep an included angle less than or close to 90 degrees with an optical axis. Under the premise that quality of a super-resolution reconstructed image is not affected, the rigor requirement for machining accuracy of micro-scanning on a scanning optical element can be reduced. For the conditions of detectors of different field frequency or different scanning modes, the effect of dynamic scene super-resolution real-time imaging is achieved.

The invention discloses a vibration-damping and noise-eliminating thermal expansion valve, which comprises a valve body (1), a power head (2), a push rod sleeve (3), a push rod (4), a steel ball valve core (5), a valve core holder (51), a damping clamp (6), a spring (7), an adjustment nut (8), and an O-shaped ring. According to the invention, the nylon push rod sleeve is arranged on the position where the push rod vertically penetrates through an air passage of the valve body; a refrigerant flow separating the air passage affects an aperture of the steel ball valve core by generating radial vibration to the push rod; and the damping clamp which is connected with the valve core holder and is elastically connected with the wall of a valve core hole is arranged in the valve core hole of the valve body, so that the aperture response motion of the steel ball valve core is lagged by friction damping between the damping clamp and the valve core hole, a flow adjustment response frequency of the thermal expansion valve is staggered with a peak phase of a vibration field frequency of an automobile, a sympathetic vibration technical scheme is avoided, and the sympathetic vibration and noise of an automotive air conditioning system during running can be eliminated.

The invention proposes a system for driving a compressor, comprising an induction motor (2) for driving the compressor (3), said induction motor including a squirrel cage rotor, and a controller (1) for controlling the induction motor, said controller comprising a memory for storing drive patterns for driving the induction motor, a first frequency generation means for generating a field frequency based on a field command and/or a second field generation means for generating a voltage frequency based on a voltage command, wherein a drive pattern in extracted from the memory based on the generated frequency or frequencies. Alternatively, the invention proposes a system for driving a compressor, comprising an induction motor (2) for driving the compressor (3), said induction motor including a squirrel cage rotor, and a controller (1) for controlling the induction motor, wherein the controller is adapted to distinguish between a steady state and a transient state of the induction motor.

A liquid crystal display device includes a liquid crystal display element section that is initialized such that the alignment state of liquid crystal molecules is transitioned from a splay alignment to a bend alignment capable of displaying an image, and a driving circuit DR that cyclically applies, after the initialization, to the liquid crystal display element section a reverse transition prevention voltage, which prevents reverse transition from the bend alignment to the splay alignment, and a display voltage corresponding to a display signal supplied externally. In particular, the driving circuit DR is configured to alter a reverse transition prevention driving condition on the basis of a field frequency of the display signal.

The present invention relates to an apparatus (100) for determining at least one electromagnetic quantity characterizing an electromagnetic property of an object, in particular a human body, wherein said object contains magnetic particles. The apparatus (100) applying the known principle of Magnetic Particle Imaging (MPI) comprises selection means for generating a magnetic selection field (50) having the known field pattern showing a field free point (FFP), drive means for changing the position in space of the FFP by means of a magnetic drive field, receiving means for acquiring detection signals depending on the magnetization of the magnetic particles within a field of view (28) and a reconstruction unit (152) for reconstructing a particle distribution quantity depending on the detection signals. The apparatus (100) further comprises a control unit (150) for controlling the receiving means for acquiring a first set of detection signals corresponding to a first drive field frequency and a second set of detection signals corresponding to a second drive field frequency, with both drive field frequencies differing from each other. The control unit (15) further controls the reconstruction unit (152) for reconstructing a first particle distribution quantity depending on the first set of detection signals and a second particle distribution quantity depending on the second set of detection signals. The apparatus (100) further comprises a determination unit (160) for determining the electromagnetic quantity depending on the first and second particle distribution quantity. The present invention further relates to a corresponding method as well as to a computer program.

A method of calculating far extrapolation of a transient field of electromagnetic scattering through finite difference time domain includes the steps of 1 dividing an area to be calculated into a main field area and a scattering field area according to the connecting boundary; 2 setting an extrapolation boundary in the scattering field area, and extrapolating electric fields and magnetic fields on the extrapolation boundary to obtain a far field; 3 setting transient incident waves, and sequentially updating the electric fields and the magnetic fields at each time step until the electromagnetic field distribution becomes steady; 4 writing the far field into a product of frequency factors and integral factors, and performing inverse Fourier transform on the integral factors to obtain a time domain expression; 5 setting an integral factor far field time domain response array; 6 performing Fourier transform on integral factor far field time domain response to obtain integral factor far field frequency domain response; 7 using far field and incident wave frequency domain response to obtain RCS (Radar Cross Section) changes with frequency. The method of calculating far extrapolation of the transient field of electromagnetic scattering through finite difference time domain writes the far field into the form of the product of the frequency factors and the integral factors due to the fact that the forms of frequency-time transform and time-frequency transform of the integral factors are simple, thereby simplifying the calculation and improving the efficiency.

The invention provides a frequency conversion antenna near field frequency sweeping testing system and a testing method thereof. The system comprises a testing signal source, a coupling module, a testing channel, a reference channel, a receiver and a controlling computer. The testing channel comprises a transmitting module, a to-be-tested frequency conversion antenna, a second frequency mixing module and a third frequency mixing module. The second frequency mixing module in the testing channel performs frequency conversion on multiple frequency point signals output by the to-be-tested frequency conversion antenna; local signals of the second frequency mixing module are selected in sequence according to a predetermined frequency list, and the frequency of the local signal is changed when a trigger signal is received each time, so that time shared test of the output signal of each frequency point antenna is realized; and each time the frequency of an output signal of one frequency point is converted into the frequency band of a radio frequency transmitting signal, then the local signal the same as a reference module is adopted for down conversion so as to obtain a middle frequency reference signal and a middle frequency testing signal for phase comparison and amplitude comparison. Through adoption of the method, phases of link signals can be guaranteed to be consistent, the plane near field rapid frequency sweeping testing function of the frequency conversion antenna is realized, and the test efficiency is improved.

The invention discloses a VGA (Video Graphics Array) port test device. The VGA port test device comprises a test signal module, a voltage collection module, a frequency collection module, a control module and a prompting module, wherein the test signal module is used for sending a video test signal to a VGA port; the voltage collection module is respectively used for collecting voltage signals at a red signal output end, a green signal output end and blue signal output end of the VGA port; the frequency collection module is used for collecting a line frequency signal of a line synchronous signal output end and a field frequency signal of a field synchronous signal output end of the VGA port; the control module is preset with a red voltage comparison value, a green voltage comparison value, a blue voltage comparison value, a line frequency comparison value and a field frequency comparison value which correspond to the video test signal, and the control module is used for sequentially and respectively comparing the comparison values with a red voltage signal, a green voltage signal, a blue voltage signal, the line frequency signal and a field synchronous signal one by one, and judging whether all the comparison values are respectively equal to signals or not; and the prompting module is used for prompting that the VGA port is normal if the comparison values are respectively equal to signals or prompting abnormal if the comparison values are not respectively equal to signals. According to the VGA port test device disclosed by the invention, the test is convenient. In addition, the invention also provides a VGA port test method.

The invention relates to a digital demodulation method and a demodulator for a non-synchronous composite video signal and an S video signal. The method comprises the following steps: a fixed sampling clock is set to collect data for the entire demodulation process; the composite video signal or the S video signal is converted into an initial digital signal; a field-synchronizing signal and a line synchronizing signal in the initial digital signal are restored, and the field frequency and the line frequency in the initial digital signal are calculated and locked; the color intensity in the initial digital signal is demodulated; a line synchronizing phase is secondarily sampled by the interpolation method; the phase is adjusted; the intense color is separated; and the brightness, the contrast degree and the saturation degree are adjusted. By utilizing the invention, the dependence on an analog phase-locked loop in a video demodulator can be eliminated. The phase-locked loop is the important core in the digital video demodulator and is the only one who cannot be separated from the analog. Therefore, in an integrated circuit of the digital video demodulator, not only the reducing of the area and complexity of the integrated circuit is realized, but also the effect brought by using the phase-locked loop is also achieved.

A moving image portion that indicates a moving object moving not less than a given movement amount and a still image portion other than the moving image portion are distinguished with respect to a video signal. Video display data for displaying the moving image portion is generated by repeatedly using the same video signal by repetition times based on temperature of a liquid crystal panel. Movement display data for displaying movement positions of the moving image portion is then generated based on a video signal obtained after the video signal used for displaying the moving image portion and is combined with the video display data. This achieves an effect similar to that obtained by decreasing a field frequency and decreases a “tail trail” phenomenon of the moving object. Furthermore, the movement display data enables recognition of the almost actual position of the moving object.

An image conversion apparatus includes a progressive scanning converter for receiving an input image as a first interlaced scanning image having a field frequency of m (m: integer not less than 2) fields/sec, and converting the first interlaced scanning image into a first progressive scanning image having a frame frequency of m frames/sec; a frame frequency converter for converting the first progressive scanning image into a second progressive scanning image having a frame frequency of n (n: integer not less than 1) frames/second, by thinning the first progressive scanning image in frame units; and an interlaced scanning converter for converting the second progressive scanning image into a second interlaced scanning image having a field frequency of 2n fields/sec, and outputting the second interlaced scanning image.