1408 results about "Noise detection" patented technology

An implantable cardiac rhythm management device operable in an autothreshold or autocapture verification mode, wherein the rhythm management device is capable of detecting noise that affects signal characteristics of a sensed intracardial evoked response electrogram signal. The device includes a noise detection circuit that determines whether a minimum peak timing occurs during a predetermined time following delivery of a stimulation pulse. If a minimum peak timing occurs during the predetermined time following delivery of the stimulation pulse, then significant amounts of noise affecting the signal characteristics of the electrocardiogram signal is assumed.

A noise control device according to the present invention is capable of reducing noises respectively arriving in a plurality of spaces which are acoustically independent from each other. The noise control device comprises: sound output means, which are respectively provided in the plurality of spaces so as to respectively correspond to the plurality of spaces, each for outputting a sound to a corresponding space; noise detection means, which is provided in at least one of the plurality of spaces, for detecting a noise arriving in the at least one of the plurality of spaces; and signal generation means which is a single means for generating, based on the noise detected by one of the noise detection means, a cancellation signal for canceling the noise, and outputting the generated cancellation signal to each of the plurality of sound output means.

The embodiment of the invention provides a method for full frequency domain digital hearing aid, which comprises the following steps: firstly, acquiring input voice signals of front and back two microphones and performing framing, Fourier transformation and voice scene type recognition; secondly, when voice is mixed with noises, performing noise detection of subframe voice frequency domain signals, beamforming of the two microphones, wind noise processing and inhibition of other noises, compacting the dynamic ranges of frequency domains and inhibiting acoustic feedback; and finally performing the Fourier transformation and overlap-add to obtain output voice signals. The embodiment of the invention also discloses equipment for full frequency domain digital hearing aid. Through the proposal provided by the embodiment of the invention, the problem that the prior digital hearing aid focuses on solving only one aspect of hearing disorder rather than comprehensively take all factors influencing use effect into consideration is solved. Meanwhile, the embodiment of the invention provides a proposal for full frequency domain digital hearing aid. The method, the equipment and proposal have the advantages of quick processing, less resource occupation, low energy consumption and the like.

Methods and systems of noise detection and response for use when monitoring for arrhythmias are described herein. At least two electrodes are used to obtain a signal indicative of cardiac electrical activity. The signal is bandpass filtered to obtain a filtered signal. Ventricular depolarizations are monitored for based on comparisons of the filtered signal to a first threshold. Arrhythmias are monitored for based on ventricular depolarization detections that occur as a result of monitoring for ventricular depolarizations. During one or more noise detection windows, noise is monitored for and a likelihood that monitoring for arrhythmias is adversely affected by noise is determined based on results thereof. Whether and/or how the monitoring for arrhythmias is performed is modified when it is determined that monitoring for arrhythmias is likely adversely affected by noise.

A pressure-sensitive capacitive sensor is provided that can easily remove noises delivered from a human body. The capacitive sensor includes a sensor unit having a first substrate where a plurality of vertical wiring lines is formed and a second substrate where a plurality of horizontal wiring lines is formed, the first and second substrates being disposed in a matrix and facing each other with a gap interposed therebetween, and a capacitance at intersections between the vertical wiring lines and the horizontal wiring lines changed in response to an external pressure; and a detecting unit for detecting the change in capacitance at the intersections between the vertical wiring lines and the horizontal wiring lines, and detecting an externally applied pressure distribution based on the detecting result. In this case, a horizontal wiring line 50 for noise detection is disposed on a surface where the horizontal wiring lines are formed in the second substrate.

An apparatus for active feed forward electromagnetic interference (EMI) filtering, including, a noise detection circuit that receives EMI noise occurring at a noise source, and an active feed forward circuit operatively coupled to the noise detection circuit. The active feed forward circuit generates a noise canceling signal based on the EMI noise received by the noise detection circuit. The apparatus further includes a filter operatively coupled to the active feed forward circuit and the noise source, the filter adapted to receive the EMI noise occurring at the noise source and the noise canceling signal from active feed forward circuit, wherein the filter cancels the received EMI noise based on the received noise canceling signal to reduce EMI noise at a load.

A medical device for processing physiological signals such as electrocardiograms. The processing includes: sampling a physiologic signal in a first channel with a first sampling rate, simultaneously sampling the physiologic signal in a second channel with a higher sampling rate to thus generate pairs of sampling values, forming the difference between two sampling values of each pair, comparing said difference with a threshold, and generating a noise detection indicator whenever said threshold is exceeded.

A noise suppression circuit for a communications channel (10) comprises a hybrid device (11) coupled to the channel for providing a differential output signal corresponding to a received signal. A delay unit (12) delays the differential signal by a suitable amount to allow for the generation and subtraction of a noise estimate. A summing device (13) extracts a digital common mode signal from the channel, and a noise estimation unit (16) provides a common mode noise estimate signal in dependence upon a history of the common mode signal over a predetermined period of time and over a plurality of frequency bands. The common mode noise estimate signal is combined subtractively (19) with the delayed differential signal to cancel common mode noise elements of the delayed differential signal. The noise estimation unit may comprise an analysis filter bank (20) for producing a plurality of subband signals (S1-SM), each at a different one of a plurality of different frequencies, a plurality of noise detection circuits (231-23M), each for processing a respective one of the plurality of subband signals to provide a component of the common mode noise estimate signal, and a synthesis filter bank (24) for processing the common mode noise signal components to provide the noise estimate signal.

The presence or absence of objects is determined by interrogating or exciting transponders coupled to the objects using pulsed wide band frequency signals. Interrogation is broken down into a number of subsample scan cycles each having interrogation cycles a start time forward in time by a fraction of a period of an expected transponder response signal. Ambient or background noise is evaluated and a threshold adjusted based on the level of noise. Adjustment may be based on multiple noise measurements or samples. Noise detection may be limited, with emphasis placed on interrogation to increase the signal to noise ratio. Matched filtering may be employed. Presence/absence determination may take into account frequency and/or Q value to limit false detections. Appropriate acts may be taken if detected noise is out of defined limits of operation, for example shutting down interrogation and/or providing an appropriate indication.

The present invention relates generally to a partial discharge counter for the diagnosis of a GIS. The partial discharge counter includes a partial discharge detection sensor for detecting a partial discharge. A first surge inflow prevention circuit separates a surge signal from an output terminal of the partial discharge detection sensor. A channel 1 frequency conversion module forms a low-frequency signal. A noise detection sensor detects noise. A second surge inflow prevention circuit separates a surge signal from an output terminal of the noise detection sensor. A channel 2 frequency conversion module forms a low-frequency signal. An ADC circuit generates partial discharge data and noise data. A synchronization device enables the partial discharge data and the noise data to be output in synchronization with frequency of the phase voltage. A digital signal processing unit counts a number of times the partial discharge occurs. Counting units display a count value.

A device may be used for conditioning an upstream bandwidth. The device can include a return path extending at least a portion of a distance between a supplier side connector and a user side connector, and a coupler connected within the return path, the coupler providing a secondary path. An offset or noise detection circuit is connected electrically downstream the coupler. A microprocessor is connected to the detection circuit. A variable signal level adjustment device is connected within the return path. The variable signal level adjustment device can be controlled by the microprocessor responsive to a detected offset level or noise floor in the return path.

A torque sensing device for measuring the torque applied to a rotatable shaft, and also measuring the magnetic field noise affecting the device. The device incorporates a switching function thereby enabling the device to operate in a common signal detection mode and a differential noise detection mode. The device is capable of determining the torque applied to the rotatable shaft based upon output signals obtained from magnetic field sensors operating in both the common signal detection mode and the differential noise detection mode. The device is capable of accurately measuring a torque induced magnetic field and is capable of canceling measurement error resulting from noise induced magnetic fields.

The invention discloses a traditional Chinese medicinal material microscopic image noise filtering system and method adopting a pulse coupling neural network. A pulse coupling neural network model suitable for processing tissue image information is adopted for detecting traditional Chinese medicinal material microscopic images. When small-density pulse noise pollution happens to the traditional Chinese medicinal material microscopic images, adaptive weighted filtering processing is carried out; when large-density pulse noise pollution happens to the traditional Chinese medicinal material microscopic images, the introduction dual-structure element mathematical morphology with edge detailed information kept is adopted for secondary filtering. Earlier foundations are laid for further improving quality testing, recognition and identification of traditional Chinese medicinal materials; higher noisy point detection performance is achieved, the noise fallout ratio and omission ratio are low, and the noise detection precision is high; detection time is short, and automatism is high; noise is removed, meanwhile, noise interference can be effectively filtered out, and image edge details and other information can be protected well.

The invention discloses a method for detecting and repairing a cycle slip by utilizing a BeiDou three-frequency observed quantity. The method mainly comprises the following steps of: 1, performing linear combination by utilizing the three-frequency observed quantity under the condition of providing a three-frequency signal by a BeiDou satellite navigation system, and constructing a combination noise detection quantity by selecting proper combination coefficients to detect the cycle slip; 2, after the cycle slip is detected, calculating and screening to obtain three sets of combination coefficients with superior performance in a pseudo-range carrier phase combination method, and calculating and repairing the cycle slip by utilizing the pseudo-range carrier phase combination method; and 3, finally, performing verification on a cycle-slip repairing effect by utilizing the combination noise detection quantity. The method for detecting and repairing the cycle slip is not related to the motion state of a carrier, can be used for reliably detecting and repairing the minimum cycle slip of which the time of losing lock reaches up to 30 seconds and can be used for detecting and repairing the cycle slip by the zero-difference, single-difference or double-difference carrier phase observed quantity when static measurement or dynamic measurement is performed.

In order to reduce noise appropriately according to scaling factor and a degree of motion of an image and to suppress degradation in image quality resulting from the noise reduction to a negligible level, a noise reduction control section outputs a noise detection instruction, a noise detection threshold instruction and a filtering mode instruction based on a scale factor output from a scale factor calculating section and a motion detection result output from a motion detecting section. A mosquito noise reducing section and a blocking artifact reducing section in a noise reducing section adaptively conducts an appropriate noise reducing process using noise detection sensitivity and the number of filter taps and a filter coefficient of a smoothing filter according to these instructions.

The invention relates to a method for detecting and positioning the leakage of an oil-gas pipeline by utilizing an autonomous navigation robot. The method comprises a robot pipeline line-tracking detection method and a terminal computer detection positioning method; marking lines and correcting nodes are painted on the road surface near the pipeline along the axial direction of the pipeline; the robot navigation system adopts the photoelectric coding and correcting node identification method for navigation and line-tracking detection; a data acquisition combiner is formed by an ultrasonic sensor and a smell sensor to acquire a signal of the oil-gas pipeline, the signal passes an amplifying-filtering circuit and a control module, undergoes analog/digital conversion, modulated by a wireless communication module and sent to the computer; analytic software of the system adopts an algorithm combining the adaptive fuzzy noise detection smoothing algorithm and the multi-scale Gaussian filter algorithm to process data of ultrasonic strength and gas strength; and when the two signals are received at the same time and both higher than the threshold values, the leakage of the pipeline can be determined, and the alarm rings and the leakage can be positioned. The method is applicable for the line-tracking detection and leakage positioning of the oil-gas pipeline in an underground comprehensive pipe ditch.

In apparatus and method for detecting a traffic lane mark for an automotive vehicle, a plurality of traffic lane detection windows are set in a manner for the traffic lane to be included in each traffic lane detection window from an image data photographed by a photograph device, the traffic lane mark is detected from a luminous intensity information within each traffic lane detection window of each coordinate point, a plurality of noise detection windows are set at positions which abut the respective traffic lane detection windows, an edge intensity within each noise detection window is detected; a weight value to a predetermined number of the traffic lane detection windows is modified in accordance with the edge intensity in the noise detection window; and a road contour is calculated using the traffic lane detected at the window internal traffic lane detecting and the modified weight value.