60results about How to "High signal resolution" patented technology

Methods, circuits, and systems for processing a preamble field in a read channel (e.g., in a magnetic storage device such as a hard disk drive). The methods generally include the steps of (a) reading the preamble field, wherein the preamble field comprises a repetitive bit pattern having a logical transition every x bit periods, where x is an integer of at least 3 when d is 0 or 1, or where x is an integer of at least d+2 when d is greater than 1, and (b) processing the repetitive bit pattern. The methods may further relate to processing the preamble for synchronization with the read channel and/or for measuring the fly height of a read/write head. The invention also relates to methods of enabling read channel synchronization and/or fly height measurement. The circuitry for fly height measurement generally includes (a) reading logic configured to read a preamble field from a read channel, wherein the preamble field comprises a repetitive bit pattern, (b) determination logic configured to determine a characteristic of the repetitive bit pattern, and (c) correlation logic configured to correlate the characteristic to the fly height. The systems generally comprise those that include a circuit embodying one or more of the inventive concepts disclosed herein. The present invention advantageously provides improved resolution of signals resulting from the preamble fields and of harmonics of said signals, and enables fly height measurement and improved channel synchronization without consuming dedicated tracks, platters, etc. on a magnetic recording medium.

A semiconductor circuit including: an A/D converter circuit which converts an inputted first signal into a second signal. The A/D converter circuit includes a comparator circuit which compares a voltage of the first signal and a reference voltage; an A/D conversion controller circuit which outputs a digital signal in accordance with comparison results given by the comparator circuit, as a fourth signal and which outputs, in accordance with the third signal, a digital signal corresponding to the first signal, as the second signal; and a D/A converter which converts an inputted fourth signal into an analog signal and which outputs the analog signal as the reference signal. The comparator circuit includes a transistor having a first gate and a second gate. The first signal is inputted to the first gate, the reference signal is inputted to the second gate.

An amplifier characterized by gain and output power comprises: (i) at least one gain medium; (ii) at least one pump supplying optical power into the gain medium; and (iii) a controller controlling the gain and the output power of the amplifier. The controller includes a signal compression circuit to cover a wide dynamic range for optical input and output signals, so that resolution for low optical signals is better than resolution for high optical signals.

An encoder for digital audio signals at a higher sample rate creates a stream for consumer distribution at a lower sampling rate, with compatibility for standard PCM players without a decoder. In conjunction with a suitable decoder, two enhanced playback options are supported, the first option allowing full lossless reconstruction of a noise-shaped higher sampling rate signal, the second option allowing lossy bandwidth extension even if an intervening transmission chain has truncated the least-significant-bits of the encoder's output signal.

The invention discloses an optical fiber vibration sensing system of a single light source pulse and a sensing method of the optical fiber vibration sensing system of the single light source pulse. Under the control of FPGA, a code is formed by an optical pulse, coded pulsed light is formed through a coupler, a sensing optical fiber is injected through an optical fiber circulator, interference is generated by backward propagation scattered light generated in the process of the propagation of the sensing optical fiber, the interference enters into the coupler through the optical fiber circulator to be interfered with local oscillating light, and beat frequency signals are generated; the beat frequency signals are converted into electrical signals by a photoelectric detector, difference frequency components are filtered through a band-pass filter circuit, the reduction of beat frequency is achieved through a frequency mixer, at last the signals are collected and amplified by a collection card, in an upper computer, the respective amplitude modulation and demodulation of each control frequency are achieved, and decoding and location processing are carried out. The optical fiber vibration sensing system of the single light source pulse has the advantages, peculiar to a distributed optical fiber detecting and monitoring system, of being distributed and subject to small external disturbance such as electromagnetism, the installation is convenient, and various vibration detecting and monitoring application, especially for long distance pipeline monitoring and perimeter security, can be met well.

An all-digital phase-locked loop (ADPLL) composed of digital circuits is provided. The ADPLL includes a phase-frequency detector (PFD), a control unit, a digital controlled oscillator (DCO), and a plurality of frequency dividers. A first frequency divider divides a frequency of a feedback signal CK_OUT by a natural number M to generate a first output signal CK_OUT/M. The PFD generates a decrement signal dn and an increment signal up, based on a phase difference and a frequency between a first reference clock signal CK_IN and the first output signal CK_OUT/M. The DCO generates a clock signal CK_DCO based on the digital control signals. A second frequency divider receives the digital control signals from the control unit and the CK_DCO from the DCO and divides the frequency of the CK_DCO by a bit number of the digital control signals to generate a feedback signal CK_OUT to the first frequency divider.

Disclosed is a charge transfer-based circuit arrangement for capacitive proximity switches comprising a capacitive sensor element (C3), the capacity of which changes according to the actuation mode. Said circuit arrangement comprises a central capacitor (C2), a first controllable connecting means (D2) that impinges the capacitive sensor element with a charging voltage (U3) according to a triggering signal, and a second controllable connecting means (T1) which connects the capacitive sensor element to the central capacitor according to the triggering signal in order to transfer the charge from the capacitive sensor element to the central capacitor. The charging voltage can be an AC voltage while the connecting means can be impinged upon by the AC voltage in such a way that the first connecting means or the second connecting means is alternately conductive.

Embodiments of the invention disclose a stress, temperature and vibration composite detection optical fiber sensor and a signal processing method. Laser light is divided into two beams; a part of thefirst beam of light is taken as local oscillator light, and the rest part is incident from the head end of a sensing optical fiber after passing through an acousto-optic modulator; after the second beam of light is subjected to frequency conversion by an electrooptical modulator, a part of the second beam of light is incident from the tail end of the sensing optical fiber, and the other part is used as reference light to be incident to a reference optical fiber; at the head end of the sensing optical fiber, the light transmitted backwards passes through a filtering raster, wherein reflected light and the local oscillator light interfere with each other, and after being detected, the reflected light is collected as a signal 1 through frequency reduction demodulation; a part of the transmitted light is directly detected and collected as a signal 2, and the other part interferes with the reference light and then is detected and collected as a signal 3; and envelope denoising is carried out on the signal 1, a vibration position is obtained by using a wavelet information entropy algorithm, the signal 2 is fitted to obtain stress or temperature distribution, envelope denoising is carriedout on the signal 3, and a vibration frequency is obtained through Fourier transform.

There is disclosed a signal processor for reception of data over a radio link in which one or more signals are processed in separate channels each optimally adapted to the signal in the sub-band being processed. Such a signal processor uses less power and at lower cost than a conventional signal processor to yield the same performance. The signal processor uses a novel combination of both analog and digital signal processing.

A method is described for packing variable-length entropy coded data into a fixed rate data stream along with resolution enhancement data, the method providing tightly constrained propagation of transmission channel errors and graceful degradation of signal resolution as entropy-coded data rate increases. An application to a multiband ADPCM audio codec is also described.

The invention discloses a single-deck capacitance electrode layout structure which comprises a substrate. A plurality of X electrodes and a plurality of Y electrodes are distributed on the substrate, wherein the X electrodes and the Y electrodes are parallel to one another and are arranged in the same direction, each X electrode comprises a main body and a plurality of branch bodies, each Y electrode comprises a main body and a plurality of branch bodies, each branch body extends from one side of the main body and then revolves back to the main body, and branch bodies of adjacent X electrode and Y electrode are arranged opposite to one another and are matched with one another. By means of the single-deck capacitance electrode layout structure, not only is a multi-finger touch function achieved, but also the cost of a touch screen is lowered. Meanwhile, coupling signals are added among electrodes, therefore, the signal strength of the touch screen is strong, the linearity of the touch screen is high, scanning speed is improved obviously, and at the same time signal resolution in a suspended state is improved.

Systems and methods for positioning a multi-featured biological array relative to a signal acquisition device. Detection of the array's positional deviation may be achieved by a calibration beam reflected from the array surface and detected by a position sensitive detector (PSD). The PSD-measured positional deviation can be transformed and used in a control loop to correct for positional variations of the array. The calibration beam and PSD may also be used to detect the array or feature boundaries, thereby allowing lateral centering or positioning of the array relative to the signal acquisition device.

The invention belongs to the technical field of biological detection, and discloses probes, a gene chip and a kit for detecting folic acid gene polymorphism. The probes include an MTHFR677-C probe, anMTHFR677-T probe, an MTHFR1298-A probe, an MTHFR1298-C probe, an MTRR66-A probe and an MTRR66-G probe. The gene chip contains the probes. The kit includes the probes and the gene chip. According to the probes, the gene chip and the kit, through selection of the specific probes and primers, a method of the gene chip is combined, and the advantages of good specificity, high accuracy and the rapidity and the convenience are achieved; through visible light optical enlargement of the gene chip, high signal resolution can be reached; meanwhile, one-time multi-site determination of folic acid genesis realized, the detection time is shortened, and the detection cost is reduced; and detection results can be directly read by picture taking or naked eyes, and the simpleness and the convenience areachieved.

The invention discloses a sample placing system and method for acquiring single-particle fluorescence-microstructure. The system comprises a first sealing ring, a slide, a second sealing ring, a coverpiece, a fixed ring, a thin film window for transmission electron microscope and a spacer, wherein a single-particle sample is loaded on a lower surface of the thin film window. When used for single-particle fluorescent measurement, the whole set of sample placing system is placed above an objective lens of a concentration fluorescent microscopy, and fluorescent spectrum and a fluorescent image can be acquired; and when used for microstructure analysis, the thin film window in the system is taken out, a transmission electron microscope sample rod is reversely placed, representation is achieved by a transmission electron microscope, and a microstructure map of a corresponding region can be obtained. Single-particle fluorescence and microstructure analysis can be performed on the same nanoparticle, and the system has the characteristics of clean single-particle fluorescent signal and high microstructure resolution.

A magnetic recording medium comprising a flexible polymer support, a gas barrier layer, an under layer and a magnetic layer in this order, wherein the magnetic layer has a granular structure comprising a ferromagnetic metal alloy and a nonmagnetic oxide, and taking a residual magnetic flux density of the magnetic layer as Br and a thickness of the magnetic layer as δ, a relationship 10[G·μm]≦Br·δ≦60[G·μm] (0.001[T·μm]≦Br·δ≦0.006[T·μm]) is satisfied.

The invention relates to a high-precision electromagnetic spectrum detection method for an ultra-deep oil and gas reservoir. An ADU-07e comprehensive electromagnetic instrument is connected to four passages simultaneously. The method comprises the following steps: tensor data collection, filtering, AD conversion and data storage; time series editing; quasi-wavelet converter technique time-frequency transformation; tensor impedance and apparent resistivity calculation; frequency depth conversion and deep correction; and result output. The high-precision electromagnetic spectrum detection methodfor the ultra-deep oil and gas reservoir overcomes the defects and deficiencies existing in an electromagnetic wave resistivity measurement method, and data is collected by tensor electromagnetic wave measuring equipment; a processing method is improved, the electromagnetic wave resistivity measurement method is improved and promoted comprehensively, and the hardware working stability, signal resolution ratio, signal-to-noise ratio and the like are improved; a processing technology is added, and an original processing method is improved, so that the reliability degree of the processing resultis improved, and the conditions of error and redundancy abnormity caused by the processing process are reduced.

The invention discloses an ultrasonic signal resolution improving method based on sparse blind deconvolution, and belongs to the technical field of nondestructive testing. According to the method, a set of ultrasonic testing system composed of a pulse generator, an oscilloscope and a pair of probes with wedge blocks is adopted, firstly, a matching pursuit algorithm is used for reconstructing collected multiple aliasing signals to remove noise interference, on the basis, system response and reflection sequences are separated based on homomorphic transformation, and finally, the sparsity of thereflection sequence is introduced, and a sparse blind deconvolution model is established in the frequency domain in combination with l2 and l1 hybrid constraints; through inversion solution, under theconditions of multiple echo aliasing and no need of a reference signal, ultrasonic signal resolution improvement and small defect quantification are realized; and compared with other methods for improving the resolution, the method has the advantages that no reference signal is needed, multiple aliasing signals can be separated, noise can be removed, the signal resolution can be improved, no extra requirement is needed for a hardware system, and the method has good engineering application value.

A rapid sensing value estimation circuit and a method thereof are provided. The circuit includes a first sensing unit, an integration sensing circuit and a rapid estimation circuit. The rapid estimation circuit includes a clock generator, a second counter, a first digital comparator, an arithmetic module and a remainder calculation module. The clock generator generates a clock signal with a first frequency. The second counter counts the clock signal within the integration time to generate a second count value. The first digital comparator determines whether the second count value exceeds a first predetermined count value when the first count value increases. The arithmetic module calculates an estimated count value result and a remainder, and the remainder calculation module can further calculate and estimate values of decimal places of this signal based on the remainder.