123 results about "Threshold test" patented technology

A sensor unit that includes at least one sensor configured to measure an ambient condition is described. The controller can be configured to receive instructions, to report a notice level when the controller determines that data measured by the at least one sensor fails a report threshold test corresponding to a report threshold value. The controller can also be configured to obtain a plurality of calibration measurements from the at least one sensor during a calibration period and to adjust the threshold based on the calibration measurements. The controller can be configured to compute a first threshold level corresponding to background noise and a second threshold level corresponding to sensor noise, and to compute the report threshold value from the second threshold. In one embodiment, the sensor unit adjusts one or more of the thresholds based on ambient temperature.

A cardiac stimulation device and method deliver independent stimulation pulses to right and left cardiac chambers, based on the capture thresholds of each chamber, and confirm capture in each chamber. A threshold test is performed in one chamber while stimulating the opposite chamber at increased pulse energy and adjusted interchamber delay.

A method and system for detecting effort events is disclosed. Effort may be determined through feature analysis of the signal as transformed by a continuous wavelet transform, which may be compared against a reference effort measure to trigger an effort event flag that signals the onset and / or severity of an effort event. For example, a respiratory effort measure may be determined based at least in part on a wavelet transform of a photoplethysmograph (PP G) signal and features of the transformed signal. A respiratory reference effort measure may be based at least in part on past values of the respiratory effort measure, and a threshold test may be used to trigger an effort event flag, which may indicate a marked change in respiratory effort exerted by a patient.

A statistical process, and system for implementing the process, is described for the analysis of stress waves generated in operating machinery or equipment. This technique is called Probabilistic Stress Wave Analysis. The process is applied to a population of individual “feature” values extracted from a digitized time waveform (such as a 2 second Stress Wave Pulse Train, or a 2 month history of Stress Wave Energy). Certain numeric descriptors of the statistical distributions of computed features are then employed as inputs to decision making routines (such as neural networks or simple threshold testing) to accurately classify the condition represented by the original time waveform data, and thereby determine a status of the operating machine / equipment.

Methods and systems involve adjusting an energy used for safety pacing based on the capture threshold. The safety pacing energy may be adjusted prior to a capture threshold test. During the capture threshold test, backup safety paces are delivered using the adjusted pacing energy. Following suspension of automatic capture verification, the device may enter a suspension mode. During the suspension mode, safety pacing pulses are delivered using a pacing energy adjusted based on capture threshold.

Cardiac devices and methods discriminate non-captured intrinsic beats during evoked response detection and classification by comparing the features of a post-pace cardiac signal with expected features associated with a non-captured response with intrinsic activation. Detection of a non-captured response with intrinsic activation may be based on the peak amplitude and timing of the cardiac signal. The methods may be used to discriminate between a fusion or capture beat and a non-captured intrinsic beat. Discriminating between possible cardiac responses to the pacing pulse may be useful, for example, during automatic capture verification and / or a capture threshold test.

Method and System are disclosed for a computer-assisted diagnostic hearing test. The computer-assisted diagnostic hearing test includes an ambient noise monitoring module configured to monitor an ambient noise in a surrounding environment, a patient information module configured to receive patient information and hearing related tests selections, and a pure tone threshold module configured to facilitate manual testing of a pure tone threshold test. The computer-assisted diagnostic hearing test further includes a speech reception threshold module configured to facilitate manual testing of a speech reception threshold test, and a speech discrimination module configured to facilitate manual testing of a speech discrimination test.

A system and method for recognizing an incoming email as a desired email examines outgoing email messages to arrange the email into fragments for which representations are created and stored. When an incoming message is received, the message is arranged into fragments for which representations are created. The representations of the incoming message are compared to the stored representations and if the matches between stored representations and the representations of the incoming message meet a predefined threshold test, the incoming message is recognized as being desirable. An incoming email message which has been recognized as being desirable can be subjected to a lesser examination to recognize a SPAM message, or to no further examination to recognize a SPAM message.

A multi-chamber stimulation device and associated method reliably and automatically distinguish fusion from loss of capture during ventricular stimulation. The stimulation device provides immediate and accurate fusion detection when a loss of capture is suspected in the ventricles without delivering back-up stimulation pulses. To achieve this objective, the far-field signal present in the atrial channel is examined for evidence of a far-field R-wave whenever the ventricular channel detects a loss of capture. If a far-field R-wave is present, fusion is confirmed, and a far-field R-wave is absent, loss of capture is confirmed. Additionally, the stimulation device inhibits unnecessary back-up stimulation and threshold tests when fusion occurs, and provides appropriate adjustment of stimulation parameters based on confirmed fusion detection such that fusion re-occurrence is minimized.

Approaches for adjusting the pacing energy delivered by a pacemaker are provided. Adjusting the pacing energy involves performing a plurality of capture threshold tests, each capture threshold test measuring a capture threshold of the heart. One or more measured captured thresholds are selected, including at least one capture threshold that is higher relative to other measured capture thresholds acquired by the plurality of capture threshold tests. The pacing energy is adjusted based on the one or more selected capture thresholds.

Cardiac devices and methods discriminate non-captured intrinsic beats during evoked response detection and classification by comparing the features of a post-pace cardiac signal with expected features associated with a non-captured response with intrinsic activation. Detection of a non-captured response with intrinsic activation may be based on the peak amplitude and timing of the cardiac signal. The methods may be used to discriminate between a fusion or capture beat and a non-captured intrinsic beat. Discriminating between possible cardiac responses to the pacing pulse may be useful, for example, during automatic capture verification and / or a capture threshold test.

Methods and systems for delivering a pacing pulse to an atrium during a cardiac cycle. A retrograde P-wave may be identified during the cardiac cycle, indicative of sub-threshold atrial pacing. Delivery of the pacing pulse to the atrium may be adjusted in a subsequent cardiac cycle in response to identifying the retrograde P-wave. Adjusting delivery of the pacing pulse may involve initiating an atrial capture threshold test, temporarily increasing one or both of the pacing pulse amplitude and pulse width, and / or re-evaluating one or both of the pacing pulse amplitude and pulse width. Adjusting delivery of the pacing pulse may also involve altering the timing of a scheduled atrial capture threshold test. During an atrial capture threshold test, a retrograde P-wave template may be generated in response to atrial non-capture sensed during the atrial capture threshold test, and used to identify subsequent retrograde P-waves.

A method of estimating a shot boundary in a digital video sequence comprises calculating a measurement of dissimilarity between each frame in the video sequence and its previous frame based on at least one of de-emphasized luminance differences and absolute color differences. Each frame is tested against shot boundary dissimilarity thresholds using the dissimilarity measurement for the frame thereby to detect the shot boundary.

A method, system and computer product for analyzing and monitoring business volume is provided. A database is linked with a database management utility. Business data is loaded on the database. The business data include data related to accounts, hierarchical account / product relationships, and hierarchical account / customer relationships. The database support relational data queries to the business data. A plurality of threshold changes is defined regarding the business data, and is associated with the database A plurality of threshold tests for detecting changes throughout a selected set of the business data is performed in accordance with the threshold change values. The results of the tests are combined to obtain a classification of data that produces business volume data. The business volume data permits the analysis and monitoring of flows of business into, out of and among account, customer and products groups of a business. The business volume data also provide customer behaviour data.

An implantable cardiac stimulation system capable of automatic capture verification is provided with an associated method for performing automatic testing functions using programmable, or automatically determined, AV delays. Automatic threshold testing and evoked response sensitivity testing performed at a user-specified AV delay setting, rather than a preset setting, allows assessment of automatic capture verification based on an AV delay relevant to daily system function. Further features of the present invention are an adjustable frequency with which automatic threshold tests are performed and an adjustable frequency with which threshold test results are stored in memory in a threshold record for better monitoring of lead stability or impending clinical problems. The frequency of performing threshold tests and the frequency of storing threshold test results may be varied according to the threshold stability. Stored threshold test results are advantageously displayed with respect to a fixed or variable time scale.

A logging-while-drilling density sensor includes a gamma ray source and at least two NaI detectors spaced apart from the source for determining measurements indicative of the formation density. A magnetometer on the drill collar measures the relative azimuth of the NaI detectors. Measurements made by the detectors are partitioned into bins defined by azimuth. A compensated bulk density is determined for selected ones of said azimuthal sectors that meet a threshold test related to a minimum difference of measurements or a minimum correction. The method of the invention may also be used with neutron porosity logging devices.

Test procedures for determining a neural stimulation threshold of a patient. In one embodiment, the procedure includes applying a test stimulation signal to the patient and monitoring the patient for a response to the test stimulation signal. The procedure can further include determining a first neural stimulation threshold and calculating a second neural stimulation threshold. The first neural stimulation threshold corresponds to the lowest intensity test stimulation signal that evokes a patient response. The second neural stimulation threshold corresponds to a treatment stimulation signal directed toward affecting a neural activity within the patient.

The invention belongs to the field of image processing. In order to realize the purposes of not only reducing complexity at an encoding end and reducing transmission data bandwidth, but also improving adaptability and signal noise immunity of the algorithm and having robustness to background changes, the invention discloses a compressed sensing-based multi-view target tracking and 3D target reconstruction system and method, the technical scheme comprises the following steps: enabling cameras to be distributed at positions capable of observing the majority of observation areas, wherein the observation areas can be 2D or 3D spaces; after sampling the observation areas, firstly conducting compressed sampling, then conducting background updating through two moving averages, adopting the algorithm with anti-noise ability to obtain a compressed sampling value of background-subtracted images; detecting interested targets through threshold test by utilizing the compressed sampling value of the obtained background-subtracted images; and performing the analytical algorithm on the interested targets. The compressed sensing-based multi-view target tracking and 3D target reconstruction system and method is mainly applied to the design and manufacture of an image sensor.

The invention discloses a reverberation room platform based method for testing electromagnetic environment effects of an electronic system. The method is applicable to threshold testing of the electromagnetic environment effects of the electronic system on the basis of a reverberation room platform. The method includes the steps: 1, setting up a test platform; 2, keeping a reside position of a stirrer unchanged, setting a signal source transmitting frequency, increasing amplification factor of a power amplifier until electromagnetic environment effects occur in the electronic system, and recording the current forward input power; 3, changing the reside position of the stirrer, and repeating the step 2; 4, repeating the step 3 to obtain forward input powers corresponding to a plurality of reside positions of the stirrer; 5, taking the minimal forward input power obtained at the step 4 as the input power of a transmitting antenna, enabling the stirrer to rotate by one circle step by step to obtain corresponding electric field strength at each reside position, and taking the maximum value of the electric field strength as the threshold of the electromagnetic environment effects of the electronic system under the signal source transmitting frequency. The reverberation room platform based method has the advantages of procedure simplicity, easiness in implementation and high repeatability of test results.

An implantable cardiac stimulation system provides capture threshold stability assessment. The system includes an implantable pulse generator that provides pacing stimulation pulses, an implantable lead system that couples the pulse generator to a patient's heart, and a capture threshold test circuit that performs capture threshold tests with the pulse generator and provides capture thresholds at spaced apart times. A capture threshold processor responsive to the capture thresholds provides capture threshold stability indicia. The capture threshold stability indicia may be a threshold stability index equal to the ratio of the peak-to-peak threshold fluctuation and the mean capture threshold. The threshold stability index may be compared to a given standard to determine if the capture thresholds are unstable.

A system, method, and computer program product for segmenting a document are disclosed. The method considers a zone of a document, such as a page frame or other zone which is a predetermined ratio thereof, and while there are remaining elements in the zone, iteratively tests different segmentations of the zone into n candidate columns, and computes a width of a gutter for each n-candidate. Assuming that the gutter width computed meets a threshold test, which may be based on the arrangement of the elements in the columns, and the candidate columns for the n-candidate each contain at least a threshold number of elements, elements are assigned to respective ones of n segmented columns within which they are located. For example, line elements are arranged in blocks of text within the columns, enabling a reading order for sequences of text, such as complete sentences and paragraphs, to be computed.

The invention discloses a multi-beam coaxial laser damage threshold test device and a realization method. According to the multi-beam coaxial laser damage threshold test device, four high-energy pulsed lasers are adopted, reflected by corresponding prisms and then enter a coaxial optical system, four light beams use one set of system and a computer control processing system, a variable-interval positive lens and a variable-interval negative lens are utilized to constitute a beam expanding system, the optical interval of the beam expanding system is adjusted, and thus collimated beam expandingof laser beams with different wavelengths can be achieved; and a stepper motor is adopted to precisely control the position of a focusing lens, and focal lengths of the different laser wavelengths arecompensated, so that it is ensured that laser is transmitted to the test surface, and the size and defocusing amount of a light spot are constant. According to the multi-beam coaxial laser damage threshold test device, integration, automation and intellectualization of a test system are achieved, thin film damage can be judged quickly and accurately in real time online, and laser damage thresholds of the various different wavelengths can be measured through the same test device.

A method for compressing framebuffer data is presented. The method includes determining a reduction ratio for framebuffer data in a tile including multiple samples. The reduction ratio determined is independent of the sampling mode, where the sampling mode is the number of samples within each pixel in the tile. The method further includes comparing a first portion of the framebuffer data for each of the multiple samples to determine an equality comparison result and also comparing a second portion of the framebuffer data for each one of the multiple samples to compute per-channel differences for each one of the multiple samples and testing the per-channel differences against a threshold value to determine a threshold comparison result. Finally, the method comprises compressing the framebuffer data for the tile based on the reduction ratio, the equality comparison result and the threshold comparison result to produce output framebuffer data for the tile.

Methods of encoding and decoding for video data are described for encoding or decoding coefficients for a transform unit. In particular, the sign bits for the non-zero coefficients are encoded using sign bit hiding. Two or more sets of coefficients are defined for the transform unit and a sign bit may be hidden for each set, subject to satisfaction of a threshold test. The sets may correspond to coefficient groups that are otherwise used in multi-level significance map encoding and decoding.

Methods and systems are directed to selecting from a variety of capture verification modes. A plurality of capture verification modes, including a beat by beat capture detection mode and a capture threshold testing mode without intervening beat by beat capture detection is provided. An efficacy of at least one of the capture verification modes is evaluated and, based on the evaluation, a capture verification mode is selected.

Provided is a frame synchronization method for synchronizing frames with pilot blocks added thereto based on differential correlation information in a satellite communication system. The method can acquire a highly reliable frame synchronization estimation value by achieving a multi-step threshold value test using pilot blocks after a correlation analysis and a threshold test based on a sync signal in order to resolve the problem of a low signal-to-noise ratio and a large frequency error and acquire highly reliable frame synchronization performance, and can overcome distortion of a correlation analysis value caused by the frequency error by analyzing correlation based on differential information. The method includes the steps of: a) performing correlation analysis and a threshold test by using a sync word; and b) performing a multi-step correlation value test by using the pilot blocks added to the frames prior to the sync word.

The invention relates to a method for calibrating laser-damaged thresholds. The method includes the steps that in three-wavelength high-reflection film plating, evenly-distributed mixed type knot defects are prepared through SiO2 particles in three sizes in combination with absorbability metal Hf film; the advantages, including the large size, the even particle diameters, the even space distribution and the good laser damaged characteristic coincidence, of the knot defects are used, the knot defects serve as standard samples in a raster scanning laser damaged threshold test, and the damaged thresholds of 90% of the knot defects within certain area during splashing are measured in a statistics mode; the least square fit is carried out on measurement results of different laser damaged threshold testing systems, and the slope and the intercept of a fit straight line are calibration parameters of the laser-damaged thresholds. Compared with the prior art, the method has the advantages of being simple and accurate in judgment and the like.