1645 results about "Amplification factor" patented technology

The output current value of a direct-current power source obtained by low-frequency, minute modulation of the input voltage of a switching converter is detected in a circuit having an amplification factor switching function that switches the amplification factor between definite magnitudes synchronizing with the modulation, and by using a signal obtained by demodulating in a discriminator circuit the output of this circuit synchronizing with the modulation to control the switching converter, the power point of the switching converter can be tracked to the maximum power point by following the change in state of the direct current power source.

The invention discloses a high-resolution dictionary based sparse representation image super-resolution reconstruction method. The method comprises the following steps of: (1) constructing a high-resolution brightness image library; (2) generating a sample training set; (3) learning an over-complete dictionary; (4) primarily establishing a high-resolution image brightness space; (5) establishing an image sample test set; (6) updating the high-resolution image brightness space; (7) calculating a weight sparse matrix; (8) reupdating the high-resolution image brightness space; (9) judging whether to repeat execution; and (10) outputting a high-resolution image. The high-resolution over-complete dictionary learned by the invention can be applied to different amplification factors. Sparse representation, non-local prior and data fidelity constraint are fully utilized, so that local information and global information can be comprehensively utilized. The method has higher super-resolution capacity; and the reconstructed image is closer to an actual image.

The invention discloses an image super-resolution method based on dense connection network. By increasing the depth of a convolution neural network and introducing a large quantity of jumping connection in the deep network, the image super-resolution method based on dense connection network effectively solves the problem that the gradient disappears during the reverse propagation of the deep network, optimizes flowing of information on the network, and improves the super-resolution reconstruction capability of the convolution neural network. At the same time, the image super-resolution method based on dense connection network is effectively combined with the bottom layer characteristic and the high layer abstract characteristic, and can reduce the model parameters and compress the deep network model so as to improve the reconstruction efficiency of the image super-resolution. Besides, by introducing a deep monitoring technology, the image super-resolution method based on dense connection network can reconstruct the super-resolution image at different depth of network, thus not only optimizing training of the deep network, but also being able to selecting a suitable network depth to reconstruct a high definition image according to the calculation capability of the test terminal during the testing process. Finally, the image super-resolution method based on dense connection network utilizes an image ser having a plurality of amplification factors to train, so that the obtained model can perform image super-resolution on a plurality of dimensions and does not need to train different models for every amplification factor.

A light emitting device has a plurality of pixels, each of which includes a drive transistor, a light emitting element and signal lines, a property parameter acquisition circuit which acquires property parameter, a signal correction circuit that generates a corrected gradation signal by correcting the image data based on the property parameter, and a drive signal impressing circuit that impresses a drive signal, generated based on the corrected gradation signal, on the pixel to drive it. The property parameter is constituted of a threshold voltage, a current amplification factor and its irregularity of the drive transistor, and is acquired based on measured voltages of the signal lines after each of a plurality of predetermined settling times elapses from the time when the light emitting device cuts off a voltage subsequent to impressing the voltage on each pixel for a predetermined length of time.

The invention provides an isolated island operation detection method of photovoltaic grid-connected generation system which includes: a control device detects voltage frequency of grid-connected point, judges voltage frequency of grid-connected point whether reaching frequency protection threshold, if yes, a start anti-isolated island protection signal is outputted; if not, frequency signal of grid-connected current instruction is calculated by using double positive feedback active frequency deflection method, and the frequency signal is outputted; the double positive feedback active frequency deflection method is that obtained grid-connected point voltage frequency deflection relative to average frequency is used as first positive feedback, and change trend of frequency deflection is used as second positive feedback, feedback magnification factor of first positive feedback is adjusted. The method realizes isolated island detection rapidly, simulation and experimental result, isolated island detection time is shorten in 0.10s, 0.13s, grid-connected current harmonic distortion THD are 2.06%, 2.97% respectively, and has advantage over traditional method in isolated island detection speed and reducing interference to power network.

The invention discloses a method for calibrating external parameters of a monitoring camera by adopting reference height, which comprises the following steps of: far vanishing point and lower vanishing point-based vision model description and related coordinate system establishment; projected coordinate calculation of reference plumb information-based far vanishing points and lower vanishing points in an image plane; reference height calibration-based camera height, overhead view angle and amplification factor calculation; design of a reference plumb direction-based horizon inclination angle calibration tool; and design and use of perspective projection model-based three-dimensional measurement software and three tools for three-dimensional measurement, namely an equal height change scale, a ground level distance measurement scale and a field depth reconstruction framework. The calibrating method is simple and convenient in operation, quick in calculation and high in measurement precision. The reference can be a pedestrian, furniture or an automobile; and a special ground mark line is not needed. The method allows the camera to be arranged at a low place, and the shooting overhead view angle is slightly upward as long as the bottom of the reference can be seen clearly in the video and the ground level coordinate system is definite.

The invention concerns a process for shortening the braking distance of a vehicle equipped with a brake servo unit which during a standard braking action is only triggered by the brake pedal pressure caused by the driver and in case of a critical driving situation is so triggered by a control device that in comparison to the standard braking action an increased amplification factor is set at the brake servo unit. The invention distinguishes itself by the fact that a danger potential is determined, stating the probability that the vehicle to be braked will be involved in an accident and that the increase of the amplification factor is controlled in accordance with the danger potential.

The invention discloses a multi-task super-resolution image reconstruction method based on KSVD dictionary learning, which mainly solves the problem of relatively serious quality reduction of the reconstructed image under high amplification factors in the existing method. The method mainly comprises the following steps: firstly, inputting a training image, and filtering the training image to extract features; extracting image blocks to construct a matrix M, and dividing the matrix M into K classes to acquire K pairs of initial dictionaries H1, H2...Hk and L1, L2...Lk; then, training the K pairs of initial dictionaries H1, H2...Hk and L1, L2...Lk into K pairs of new dictionaries Dh1, Dh2...Dhk and Dl1, Dl2...Dlk by utilizing a KSVD method; and finally, carrying out super-resolution reconstruction on the input low-resolution image by utilizing a multi-task algorithm and the dictionaries Dh1, Dh2...Dhk and Dl1, Dl2...Dlk to acquire a final reconstructed image. The invention can reconstruct various natural images containing non-texture images such as animals, plants, people and the like and images with stronger texture features such as buildings and the like, and can effectively improve the quality of the reconstructed image under high amplification factors.

The invention provides a face super-resolution reconstruction method based on an extremely deep convolutional neural network, which comprises the following steps of 1, performing down sampling and processing on a high-resolution face image by different multiples to obtain a low-resolution face image training set; 2, performing down sampling and processing on another high-resolution face image by different multiples to obtain a low-resolution face image test set; 3, putting the training set obtained in step 1 and the test set obtained in the step 2 in the extremely deep convolutional neural network for training, learning the mapping of a residual image, and obtaining a corresponding convolutional network model; and 4, inputting a low-resolution face image that needs to be reconstructed intothe convolutional network model obtained in the step 3 to obtain a reconstructed high-resolution face image. The face super-resolution reconstruction method based on the extremely deep convolutionalneural network can better deal with the super-resolution reconstruction problem of multi-scale amplification factors.

A clipping prevention device, includes: a compression section adapted to compress an input digital audio signal level; a digital-analog conversion section adapted to operate at a predetermined first operating voltage and convert the digital audio signal into an analog audio signal; an electronic volume control adapted to operate at a second operating voltage and amplify or attenuate the analog audio signal with a user-changeable amplification factor; and a control section adapted to calculate a clipping level based on the maximum amplification factor of the electronic volume control and the user-changeable amplification factor, the maximum amplification factor being determined when the analog audio signal at the maximum signal level is amplified to the maximum signal level, and also adapted to control the compression section so that the signal is compressed so as to prevent clipping of the analog audio signal amplified or attenuated by the electronic volume control.

The present invention provides a photoelectric conversion device capable of detecting light from weak light to strong light and relates to a photoelectric conversion device having a photodiode having a photoelectric conversion layer; an amplifier circuit including a transistor; and a switch, where the photodiode and the amplifier circuit are electrically connected to each other by the switch when intensity of entering light is lower than predetermined intensity so that a photoelectric current is amplified by the amplifier circuit to be outputted, and the photodiode and part or all of the amplifier circuits are electrically disconnected by the switch so that a photoelectric current is reduced in an amplification factor to be outputted. According to such a photoelectric conversion device, light from weak light to strong light can be detected.

An optical disk includes a first area on which user information is recorded, and a second area in which a plurality of marks radially extending are arranged in a track direction in the optical disk. Information about the reflectance of the optical disk is recorded in the second area. It is intended to optimize the amplification factor of the reproduced signal on the basis of the information about the reflectance of the optical disk in the second area. Control data and user data can be reproduced quickly and highly reliably without depending on the relationship between the reflectances of a recording area and a non-recorded area of the optical disk.

The invention concerns a laser system with a frequency comb generator for generating a comb of optical frequencies having an offset frequency and a plurality of equidistant modes, wherein the laser system further preferably comprises at least one stabilizer for stabilizing the frequency comb onto a certain offset frequency and/or onto a certain mode spacing. The laser system further comprises an optical amplifier for amplifying the frequency comb coupled out of the frequency comb generator, the amplification factor of this amplifier being variable; and the amplifier is followed by a Raman medium for generating a Raman shift of the frequency comb.

There is provided a solid-state image pickup device comprising a plurality of pixel units, each of which includes a photoelectric conversion element, a signal line which reads out signals from said plurality of pixel units, a first capacitor element which has a first electrode connected to the signal line, an amplifier which has an input terminal connected to a second electrode of the first capacitor element, and a second capacitor element connected between the input terminal and an output terminal of the amplifier, wherein the first capacitor element has a capacitance value which is smaller at the time of execution of an adding mode than at the time of execution of a non-adding mode, and thereby making an amplification factor of the amplifier smaller at the time of execution of the adding mode than at the time of execution of the non-adding mode.

A signal level detector comprises a first voltage/current conversion circuit which outputs a first current which depends on a voltage amplitude of an inputted signal, a second voltage/current conversion circuit which outputs a second current which depends on an inputted reference voltage signal, and a comparison circuit which compares the first current with the second current and outputs an output current based on a comparison result.

The invention discloses a high-precision radial adjustable involute master of gear and an adjusting method. One tooth face of four tooth faces is selected to be not precisely ground, has higher tooth profile shape deviation and is used for detecting a frequency response characteristic, a filtering effect and sensitivity of an instrument; another three tooth faces are precisely processed and have smaller tooth profile shape deviation, one precisely processed surface has certain tooth profile slope deviation and is used for detecting an amplification factor of the instrument, and other two tooth faces on opposite sides have tooth profile slope deviation which is approximate to zero and are used for representing the precision grade of the involute master of gear, transmitting involute parameter values and determining and correcting an indication error of an involute measurement instrument. The high-precision radial adjustable involute master of gear is simple in structure, convenient to adjust, high in connecting rigidity and reliable in connection with a master core shaft and high in precision, has a stable size, and can simultaneously meet demands for frequency response characteristic, filtering effect, sensitivity, amplification factor detection and instrument indication error correction of the involute measuring instrument.

A wireless information device with its transmission power level adjustable, the drive voltage or power amplification factor associate circuit of the transmission device is adjusted depending on the communication signal strength required by the communication range and environment to select the drive voltage required by the operation of or the power amplification factor for transmission control of the transmission device, thus to avoid waste of electric power due to excessive strength of communication signal.

There is provided a solid-state image sensing device including a pixel section in which cells are arrayed, each cell including a photoelectric conversion unit, a reading circuit reading out, to a detection unit, signal charges obtained by the photoelectric conversion unit, an amplifying circuit amplifying and outputting a voltage corresponding to the signal charges, and a reset circuit resetting the signal charges, an exposure time control circuit controlling an exposure time and controlling the exposure time to be equal for all cells, an A/D conversion circuit A/D-converting a signal output from the pixel section by changing a resolution of a signal level, line memories storing an A/D-converted signal, and a signal processing circuit processing output signals from the line memories to have a linear gradient with respect to an optical input signal amount by controlling an amplification factor in accordance with a resolution of a pixel output signal after A/D-conversion.

There is provided a communication apparatus capable of performing HEAC communication with another communication apparatus compliant with HEAC communication, comprising: a receiving unit configured to receive an HEC signal from the other communication apparatus via a transmission path; a detecting unit configured to detect a signal level of the HEC signal received by the receiving unit; a deciding unit configured to decide an amplification factor of an HEC signal to be transmitted based upon the detected signal level in a case where the detected signal level is not within prescribed limits; an amplifying unit configured to amplify the HEC signal to be transmitted at the decided amplification factor; and a transmitting unit configured to transmit an HEAC signal, which includes an ARC signal and the HEC signal to be transmitted amplified by the amplifying unit, to the other communication apparatus via the transmission path.

The invention provides an image local amplification method and device for a touch screen ultrasonic diagnostic apparatus. The image local amplification method comprises the following steps of: receiving a touch screen instruction through a touch screen input module; transmitting the touch screen instruction to a controller and recording a touch screen position by the controller; taking the touch screen position as a central position by a confirmation module in an amplification region in a ZOOM amplification module; acquiring image data by combining the preset amplification region; finishing image amplification by an image interpolation module through an interpolation algorithm; transmitting a result to a display screen for display through the controller; meanwhile, updating an amplification factor by the controller and transmitting to the display screen for display; receiving a re-amplification instruction through a touch screen input module; acquiring the image data by the confirmation module in the amplification region; transmitting the image data to the image interpolation module to finish image amplification through the interpolation algorithm; transmitting the result to the display screen to display a re-amplified image through the controller; and updating the current amplification factor and displaying through the display screen. The image local amplification method is convenient to operate and intuitive in effect.