902 results about "Small amplitude" patented technology

A composite that contains an elastic film laminated to a meltblown facing is provided. During lamination, apertures and discrete bond sites may be concurrently formed in the elastic film. The discrete bond sites may be located proximate (adjacent or near to) a perimeter defined by corresponding apertures formed by displacement of the film. The location of the bond sites adjacent to or near the apertures may enhance the durability of the meltblown facing by strengthening the area surrounding the apertures. Furthermore, the content of the elastic film and the temperature / pressure of lamination may be selected to that the film possesses a sufficient tack for adhering to the facing at regions other than those fused together by the bonding elements of the patterned roll. Such secondary bonding further stabilizes the meltblown facing and renders it suitable for printing. Further, the film is under tension in the machine direction during lamination. Subsequent to lamination, however, the film is retracted so that the facing retracts toward its original machine direction length, thereby gathering and forming pleats. It has been discovered that these pleats have a relatively small amplitude (height), as well as a substantially uniform frequency across the surface of the facing. Such a small height and increased regularity improves the ability to transfer an ink to “peaks” of the pleats, thereby improving print quality and uniformity.

A medical ultrasound imaging pulse transmission method transmits at least three pulses, including at least two pulses of different amplitude and at least two pulses of differing phase. The larger-amplitude pulse is transmitted with a larger aperture and the smaller-amplitude pulses are transmitted with respective smaller subapertures. The subapertures are arranged such that the sum of the subapertures used for the smaller-amplitude pulses is equal to the aperture used for the larger-amplitude pulse. In this way, pulses of differing amplitudes are obtained without varying the power level of individual transducer elements, and precise control over pulse amplitude is provided.

A medical ultrasound imaging pulse transmission method transmits at least three pulses, including at least two pulses of different amplitude and at least two pulses of differing phase. The larger-amplitude pulse is transmitted with a larger aperture and the smaller-amplitude pulses are transmitted with respective smaller subapertures. The subapertures are arranged such that the sum of the subapertures used for the smaller-amplitude pulses is equal to the aperture used for the larger-amplitude pulse. In this way, pulses of differing amplitudes are obtained without varying the power level of individual transducer elements, and precise control over pulse amplitude is provided.

A RAKE receiver which is employed in a direct sequence spread spectrum communication system, and which can effectively receive multipath signals. A path searcher measures the amplitude of each path, selects N paths with larger amplitudes in descending order of magnitude, where N is the number of despreaders, and assigns the despreaders to the selected paths to despread the signals of the paths. This assignment of the despreaders to the paths is carried out such that a path with a large amplitude and a path with a small amplitude are assigned to adjacent despreaders and are input to the same pre-detection combiner. The outputs of the despreaders are combined by the pre-detection combiners, and detected by detectors whose outputs are RAKE combined by a post-detection combiner.

Optical sensor measurement methods that convert a wavelength change in an optical sensor to a measurable optical intensity change, which can be calibrated and used to measure optical wavelength change and environmental changes such as temperature or strain which affect sensor wavelength. The current invention makes use of tunable fiber Fabry-Perot filters as the wavelength selective elements for the wavelength to optical intensity conversion. The invention provides high measurement sensitivities to small amplitude, high frequency modulations to the fiber sensor center wavelength, accommodates for system drift from thermal or other perturbations, and enables either frequency mode or time varying resolution of sensor modulation events. Selection of proper Fabry-Perot optics allow for measurement optimization of either high sensitivity or high strain measurement range.

A constant-voltage power circuit incorporating an over-current protection circuit having a fold back current limiting capability operative through low input voltages, and being capable of arbitrarily setting current outputs. The constant-voltage power supply circuit is configured so that a voltage output with small amplitude from a differential amplifier circuit is subjected to amplitude expansion to be amplified to range fully from the ground potential approximately to the input voltage by means of an amplitude expansion circuit, which includes an inverter consisting of an NMOS transistor and a resistor, and that the voltage resulting from the amplitude expansion is subsequently input to the gate of a PMOS transistor configured to directly control an output transistor.

A display device having a pixel section including a plurality of pixel circuits arrayed in a matrix, a plurality of scan lines, a plurality of capacity lines, a plurality of signal lines, a drive circuit, and a generation circuit generating a small amplitude common voltage signal switching in level at a predetermined cycle, wherein each pixel circuit arranged at the pixel section contains a display element having a first pixel electrode and a second pixel electrode and a storage capacitor having a first electrode and a second electrode, the first pixel electrode of the display element, the first electrode of the storage capacitor, and one terminal of the switching element are connected, the second electrode of the storage capacitor is connected to the capacity lines arrayed in a corresponding row, and the common voltage signal is applied in a second pixel electrode of the display element.

An object of the present invention is to provide a rectifier circuit which can suppress loss of power due to parasitic capacitance or parasitic inductance of a semiconductor element. The rectifier circuit matches or mismatches impedance between a circuit of a previous stage and the rectifier circuit in accordance with the amplitude of an input AC voltage. When an AC voltage to be input has a smaller amplitude than a predetermined voltage, impedance is matched and the AC voltage is applied as is to the rectifier circuit. Conversely, when an AC voltage to be input has a larger amplitude than a predetermined voltage, impedance is mismatched, and the amplitude of the AC voltage is decreased by reflection and then the AC voltage is applied to the rectifier circuit.

A wave energy converter with air compression (WECWAC) includes a cylinder and a piston located within the cylinder dividing the cylinder into an upper chamber and a lower chamber. The cylinder is fixedly attached to a spar whose up / down (heave) motion is restrained. The piston is fixedly attached to, and driven by, a float which moves generally in phase with the waves. Under typical wave conditions the piston functions to compress air within the upper chamber on its up stroke and within the lower chamber on its down stroke, i. e., the system is thus double-acting. In still water, the spar and cylinder combination is designed to drift down into the body of water relative to the piston whereby the size / volume of the upper chamber is decreased (while that of the lower chamber is increased). For small amplitude waves the piston continues to compress air in the upper chamber and this asymmetrical compression continues until the waves reach a predetermine level when “double-action” is resumed. Controlling the position of the cylinder relative to the piston enables the WECWAC to automatically regulate its compression ‘stroke’ to suit varying wave conditions. The pressurized air from a WECWAC may be stored and / or processed to drive a turbo-generator or it may be combined with the outputs of other WECWACs to drive a single large and highly efficient turbo-generator.

A wave energy converter with air compression (WECWAC) includes a cylinder and a piston located within the cylinder dividing the cylinder into an upper chamber and a lower chamber. The cylinder is fixedly attached to a spar whose up / down (heave) motion is restrained. The piston is fixedly attached to, and driven by, a float which moves generally in phase with the waves. Under typical wave conditions the piston functions to compress air within the upper chamber on its up stroke and within the lower chamber on its down stroke, i. e., the system is thus double-acting. In still water, the spar and cylinder combination is designed to drift down into the body of water relative to the piston whereby the size / volume of the upper chamber is decreased (while that of the lower chamber is increased). For small amplitude waves the piston continues to compress air in the upper chamber and this asymmetrical compression continues until the waves reach a predetermine level when “double-action” is resumed. Controlling the position of the cylinder relative to the piston enables the WECWAC to automatically regulate its compression ‘stroke’ to suit varying wave conditions. The pressurized air from a WECWAC may be stored and / or processed to drive a turbo-generator or it may be combined with the outputs of other WECWACs to drive a single large and highly efficient turbo-generator.

The invention discloses a waveform peak and trough identifying method with self-adapting threshold and a device thereof. The identifying method comprises following steps: A1. multilevel amplitude thresholds are set up, including a smallest amplitude threshold Ymin, a largest amplitude threshold Ymax, a threshold step length S and a threshold level N, N equals to the result of Ymax subtracted by Ymin then divided by S, and finally added by 1, and the nth level amplitude threshold Yn equals to Ymin added by the result of n subtracted by 1 and then multiplied by S; B1. information of local wave peaks and local wave troughs in the waveform is searched; C1. a threshold of vibration amplitude of the local wave peaks or the local wave troughs is determined, and if the vibration amplitude of the local wave peaks or the local wave troughs is more than a certain amplitude threshold, the vibration amplitude is taken as a threshold wave peak or a threshold wave trough of the amplitude threshold in the level; D1. vibration amplitude threshold and time threshold of the threshold wave peaks and the threshold wave troughs are determined, and effective wave peaks and effective wave troughs are determined. The waveform peak and trough identifying method with self-adapting threshold and the device thereof have high wave form identifying rate, improved disturbance resisting capacity and increased clinical limitation of wave trough identification, and is fit for real clinical situations.

A digital camera includes an input detection section, which has an input detection plane, that detects a touching position of a finger of an operator and a sliding speed of the finger, a controller that computes a vibration pattern based on the sliding speed detected by the input detection section, and a vibration section that vibrates the input detection plane based on the vibration pattern thus computed. The controller computes a vibration pattern of the input detection plane to generate vibrations from its low frequency and small amplitude to its high frequency and large amplitude, as the finger goes away from a position where it has touched the input detection plane.

The invention relates to a micro electric mechanical microwave frequency checker, and a relative production, with simple structure, small amplitude of measuring signal, non direct-current power consumption, and easy integration. The checker uses gallium arsenide as a liner (1) arranged with a power distributor (a), a power synthesizer (b), a coplane waveguide line (e), and a fixing beam structure (c), wherein the object signal via the power distributor (a) generates two signals, to form an object signal and another object signal (Us1-Us2), the object signal Us1 is connected with the third port of the power synthesizer (b), the object signal Us2 via a section of a CPW line is connected to the second port of the synthesizer (b) in which port to obtain a first signal via the fixing beam structure (c) to obtain the phase shift phi of the microwave signal on the line with fixed length.

Pulsed radar detects the presence and range of very short-range objects via small perturbations in phase and / or amplitude of relatively long duration coherently related transmit pulses. In one embodiment, echoes forming a received signal waveform from a sampling baseband radar receiver are processed at audio frequency to look for perturbations of the phase of the time-stretched received radar signal while the radar is still transmitting a long-duration pulse. In a second embodiment, the time-stretched received signal is processed to look for perturbations in the amplitude of the received radar signal. Small amplitude perturbations due to constructive and destructive interference of the transmitted and reflected signals occur in the receiver when objects are very close to the radar if the receiver is not heavily saturated. These same techniques can also be used to achieve highly accurate ranging of long-distance objects and detection of overlapping echoes from multiple objects.

A Phase-Locked Loop (PLL) includes a Phase-to-Digital Converter (PDC), a programmable digital loop filter, a Digitally-Controlled Oscillator (DCO), and a loop divider. Within the PDC, phase information is converted into a stream of digital values by a charge pump and an Analog-to-Digital Converter (ADC). The stream of digital values is supplied to the digital loop filter which in turn supplies digital tuning words to the DCO. A number of types of ADCs can be used for the ADC including a continuous-time delta-sigma oversampling Digital ADC and a Successive Approximation ADC. The voltage signal on the charge pump output is a small amplitude midrange voltage signal. The small voltage amplitude of the signal leads to numerous advantages including improved charge pump linearity, reduced charge pump noise, and lower supply voltage operation of the overall PLL.

The invention relates to a power embedment anchor with high-frequency micro-amplitude vibration in the ship and ocean engineering technical field. The embedment anchor comprises an anchor cover, an anchor shank, an anchor hammer, a lifting lug, a high-frequency micro-amplitude vibration device, a main fin, an anchor chain, a power source and a cable, wherein the anchor cover is arranged on the upper part of the anchor shank; the anchor hammer is arranged on the lower part of the anchor shank; the lifting lug is arranged on the surface of the outer wall of the anchor shank; the anchor chain is connected with the lifting lug; the high-frequency micro-amplitude vibration device is arranged inside the anchor shank; the main fin consists of two to four sheets which are uniformly and symmetrically arranged on the surface of the outer wall of the anchor shank; the power source supplies power to the high-frequency micro-amplitude vibration device through the cable; and the cable is connected with the power source and the high-frequency micro-amplitude vibration device through an outer cover. The embedment anchor has good holding power and underwater anchor weight ratio under different submarine sediment, can rapidly hold seabed, and is little in windlass tension needed in the process of raising anchors.

An integrated multivariable predictive controller (MPC) and tester is disclosed. The invention system provides optimal control and step testing of a multivariable dynamic process using a small amplitude step for model identification purposes, without moving too far from optimal control targets. A tunable parameter specifies the trade-off between optimal process operation and minimum movement of process variables, establishing a middle ground between running a MPC on the Minimum Cost setting and the Minimum Move setting. Exploiting this middle ground, embodiments carry out low amplitude step testing near the optimal steady state solution, such that the data is suitable for modeling purposes. The new system decides when the MPC should run in optimization mode and when it can run in constrained step testing mode. The invention system determines when and how big the superimposed step testing signals can be, such that the temporary optimization give-away is constrained to an acceptable range.

A composite that contains an elastic film laminated to a meltblown facing is provided. During lamination, apertures and discrete bond sites may be concurrently formed in the elastic film. The discrete bond sites may be located proximate (adjacent or near to) a perimeter defined by corresponding apertures formed by displacement of the film. The location of the bond sites adjacent to or near the apertures may enhance the durability of the meltblown facing by strengthening the area surrounding the apertures. Furthermore, the content of the elastic film and the temperature / pressure of lamination may be selected to that the film possesses a sufficient tack for adhering to the facing at regions other than those fused together by the bonding elements of the patterned roll. Such secondary bonding further stabilizes the meltblown facing and renders it suitable for printing. Further, the film is under tension in the machine direction during lamination. Subsequent to lamination, however, the film is retracted so that the facing retracts toward its original machine direction length, thereby gathering and forming pleats. It has been discovered that these pleats have a relatively small amplitude (height), as well as a substantially uniform frequency across the surface of the facing. Such a small height and increased regularity improves the ability to transfer an ink to “peaks” of the pleats, thereby improving print quality and uniformity.

The present invention proposes a system in which an ultrasonic carrier beam is modulated using an audio input signal. The audio signal is divided into frequency bands, and that frequencies in different ones of these bands are treated differently. Specifically, different modulating schemes are used for different frequency bands. Also, different transducer aperture sizes are used for different frequency signals. Also, a further frequency equalizer is provided within each of the frequency bands. Finally, a relatively smaller amplitude modulating index (or indices) is used for signals in low frequency band(s).

The present invention is directed to an apparatus, method and software product for enhancing the dynamic range of a CCD sensor without substantially increasing the noise. Initially, the area of a N×M pixel CCD sensor array is subdivided into two regions, a large region having (M−a) pixels in each column for outputting large-amplitude signals with low noise and a smaller region having a pixels in each column for outputting small-amplitude signals with improved dynamic range. At integration time, the CCD is read out one region's rows at a time into the horizontal shift registers by shifting the pixel charges in either a or M−a vertical shifts. The charges in the horizontal shift registers are then shifted out of the horizontal shift registers in N horizontal shifts. Next, the remaining pixels in the region of the CCD are read out into the horizontal shift registers by shifting the pixel charges in the other of a or M−a vertical shifts. Those charges are then shifted out of the horizontal shift registers in N horizontal shifts. In a spectrographic application, the data from the two regions is read out in the form of a large-amplitude channel from the larger region's rows and a small-amplitude channel from the smaller region's rows.

The invention relates to a dynamic vibration absorber-based device for collecting piezoelectric vibration energy, and belongs to the technical field of energy utilization. The device comprises a piezoelectric element, a cover plate, a dynamic vibration absorber and an energy collecting circuit, wherein the cover plate is fixed on the piezoelectric element and is connected with the dynamic vibration absorber; and the energy collecting circuit is connected with the piezoelectric element. The piezoelectric element can be arranged on the surface of an external vibrating element conveniently to collect the small-amplitude vibration energy without being embedded in the external vibrating element or large amplitude; and the working frequency of the piezoelectric element can be designed in a higher frequency domain so as to realize the easily-applied and efficient collection of the vibration energy.

A differential amplifier circuit has a latch unit and a differential input portion. A minute current is kept to flow through the differential input portion. Therefore, the differential amplifier circuit can accurately amplify even a signal high in speed and small in amplitude.

An apparatus and method for non-determination of the surface velocity of a target using optical interference and Doppler shifting of the light reflected from the target are disclosed. It may be used to measure small-amplitude, acoustic frequency surface vibrations as well as non-periodic surface vibration.

A system with a capability of detecting the platform stationary status is disclosed. The first aspect is to measure three raw acceleration outputs from an apparatus of the three-axis accelerometer unit. The second aspect is to compute the mean of the latest said acceleration outputs obtained from the three-axis accelerometer unit. The third aspect is to subtract the said mean acceleration outputs from the said raw acceleration outputs obtained from the three axis accelerometer unit to find the differential acceleration components between raw and mean values. The fourth aspect is to compute the amplitude of the differential acceleration, i.e., squared total sum of the three differential acceleration components. The fifth aspect is to count the number of measurements in which the amplitude of the differential acceleration is below a certain threshold, e.g., 0.05 (m / s2) to detect the stationary status if the small amplitude lasts for a certain time length, e.g., 1 second.

A hydraulic antivibration device is provided that is capable of suppressing generation of strange sounds while ensuring a low dynamic spring characteristic upon inputting of relatively small amplitude vibration and a high damping characteristic upon inputting of relatively large amplitude vibration. To that end, upon inputting of relatively large amplitude vibration, displacement-regulating ribs of one of sandwiching members serve to regulate displacement of an elastic partition membrane pinched by the sandwiching members thus obtaining a high damping characteristic. The displacement-regulating ribs consist of three pieces extending radially and rectilinearly, so that the area of openings of the sandwiching members is made wide enough to ensure more a low dynamic spring characteristic. Displacement-regulating protrusions of the elastic partition membrane are disposed to correspond to the displacement-regulating ribs thereby ensuring to suppress the generation of strange sounds.

A device and method for correlation-based background calibration of pipelined converters with a reduced power penalty. A pipelined analog-to-digital converter (ADC) utilizes a random or pseudorandom signal to reduce the quantization error of subconverting stages. Stages within the ADC comprise an injection circuit having a plurality of capacitive branches in parallel. Less than all of the branches can function during a given clock cycle of the ADC. This allows a subconverting stage within the ADC to be accurately trimmed before operation using a large amplitude signal. At the same time, the capability to inject smaller amplitude random or pseudorandom signals into the subconverting stage during operation is maintained, saving valuable dynamic range and power. The various capacitive branches are cycled through either randomly or in sequence such that the quantizer manifests the same average gain error over time for which the quantizer was initially trimmed.

An apparatus and method for non-determination of the surface velocity of a target using optical interference and Doppler shifting of the light reflected from the target are disclosed. It may be used to measure small-amplitude, acoustic frequency surface vibrations as well as non-periodic surface vibration.

Exemplary embodiments are directed to wireless power transfer. A receiver (820) with a receive antenna (L2) couples with near field radiation in a coupling mode region. The receiver generates an RF signal at a resonant frequency responsive to the near field radiation. A de-tuning circuit (860) generates a variable impedance responsive to a control signal to modify the RF signal to a smaller amplitude or to a different resonant frequency. A rectifier (840) converts the modified RF signal to a DC signal. A comparator (850) creates a feedback loop by generating the control signal responsive to comparing the DC signal to a reference voltage (Vref). The de-tuning circuit may operate in digital mode or in linear mode with the feedback. An impedance element (R1) may be coupled to the de-tuning circuit to generate a voltage proportional to a current through the de-tuning circuit. The proportional voltage is rectified to a receive signal (1430) with information sent from a transmitter.

The invention discloses a self-adapting variable-damping hydraulic pressure rubber vibration isolation device for an automobile suspension. The vibration isolation device comprises an inner pipe, an outer pipe, a rubber body arranged between the inner pipe and the outer pipe, a separation device arranged between the inner pipe and the rubber body, wherein damping adjustment components which are used for adjusting damping force according to pressure are respectively arranged at a communicating end of a fluid flow passage of an isolator I and a hydraulic pressure working chamber, and at a communicating end of a fluid flow passage of an isolator II and a hydraulic pressure working chamber II; the damping adjustment components are arranged, under the working conditions of high frequency and small amplitude, a spring is not compressed or rarely compressed, and damping fluid flows into the fluid flow passages from the outer side of a plunger, so that the requirements for vibration reduction and noise reduction with low rigidity and small damping are satisfied; under the working conditions of low frequency and large amplitude, the inner diameter of a fluid through hole is far smaller than the hole diameter of the fluid flow passages, so that the pressure is increased, and the fluid hole diameter is decreased; therefore, at this moment, the damping force is greatly improved. Compared with an existing rubber lining, the vibration isolation device disclosed by the invention can completely satisfy the requirements of vibration reduction and noise reduction with high rigidity and high damping under the working conditions of low frequency and large amplitude.

The disclosed systems and methods utilize an advanced linearized trans-impedance amplifier (ATIA) that allows for the recovery and amplification of low amplitude analog and digital signals. This disclosure further describes unique approaches of addressing issues inherent in the transmission and reception of small amplitude multi-carrier signals used for distribution of voice, video, and data communications over both fiber optic cables and free space transmitters