14 results about "Continuous noise" patented technology

The application provides a background noise high-order surface wave dispersion extraction method, and belongs to the technical field of seismology. The method first calculates the cross-correlation function of continuous noise data and performs preprocessing to obtain an original dispersion energy spectrum; then a reference phase shift curve between the energy of the base order and the first high-order mode is extracted; the cross-correlation function is phase-shifted based on the curve, so that the base order and the high-order surface wave are separated in time, the high-order part at the negative time is retained and inverse phase shift is performed, and a cross-correlation function containing only the high-order surface wave is obtained; then the high-order surface wave dispersion energy spectrum is obtained through frequency-Bessel transformation, and is spliced with the base order part in the original spectrum to form an enhanced dispersion energy spectrum; finally, the base order and the high-order dispersion curves are extracted after quality control. The application can effectively suppress the interference of the base order sidelobe on the high-order mode, and significantly improve the continuity and signal-to-noise ratio of the high-order surface wave dispersion energy.

The invention discloses a speckle noise detection and removal method based on sound wave-laser cross-medium communication, and the method comprises the steps: analyzing and recognizing a noise position through a sliding window based on a double-feature joint detection mechanism of a kurtosis ratio and a Teager energy operator; adaptive boundary expansion is carried out on each detected noise position, and adjacent noise positions are combined to form continuous noise segments; processing the noise segments in parallel by adopting two methods of bidirectional linear prediction and empirical mode decomposition, and respectively generating prediction signals of the noise segments; according to the local signal-to-noise ratio and boundary continuity of the prediction signals, fusion weights of the two prediction signals are calculated in a self-adaptive mode, the two prediction signals are subjected to weighted fusion, and a fusion signal is obtained; endpoint continuity matching is carried out on the fusion signal through linear transformation, smooth connection of the repair section and the original signal is ensured, and speckle noise removal is completed. According to the method, speckle noise caused by dynamic water surface disturbance can be detected and effectively suppressed, and the integrity and definition of signal transmission are remarkably improved.

The present application relates to the technical field of gas turbine generator, and particularly relates to a vibration data anomaly detection method for gas turbine generator unit based on contrast analysis. The method comprises: continuously collecting continuous vibration data of the gas turbine generator unit; using an improved mean absolute deviation method to identify noise points; using background contrast detection to identify continuous noise; using a threshold selection method based on quantile plot to separate noise and outliers; and using the data after removing noise points and continuous noise to calculate the anomaly degree of the original data to complete anomaly detection. The present application effectively distinguishes noise and outliers while retaining actual anomaly data, avoids mistaking outliers as noise and filtering them out, ensures that the control system can respond to real abnormal conditions in time, and improves the reliability and accuracy of the system.

The utility model relates to the technical field of electronic cigarettes, in particular to a low-cost anti-interference multi-atomization-piece circuit driving structure which comprises a battery shell, two protective shells are arranged at the top end of the battery shell, placing grooves are formed in the two protective shells, an atomization piece body is arranged between the two placing grooves, sliding grooves are formed in the two protective shells, and the atomization piece body is arranged in the sliding grooves. A memory alloy is arranged between the two sliding grooves, a first conducting strip is fixedly arranged at the bottom end of the memory alloy, a connecting groove is formed in the top end of the battery shell, a second conducting strip is slidably connected into the connecting groove, a fixing spring is fixedly arranged at the bottom end of the second conducting strip, and the bottom end of the fixing spring is fixedly connected with the bottom end in the connecting groove. The beneficial effects of the utility model are that the device is convenient for autonomously controlling the switch of the sounder according to requirements, avoids continuous power consumption of the sounder, and is convenient for reducing continuous noise, thereby improving the use comfort of a user.

The invention relates to the field of nursing tools, in particular to an attached adjusting type constant-temperature nursing bed which comprises a supporting bed board, a flexible supporting bed frame vertically arranged on the edge of the upper side of the supporting bed board, an inflation constant-temperature adjusting mechanism and a control mechanism. And the attaching adjusting mechanism comprises a plurality of attaching adjusting modules evenly arranged on the transmission elastic cover, and each attaching adjusting module comprises a multi-point traction structure and a multi-term adjusting structure and is used for adjusting the attaching depth and the attaching angle of the deformation supporting layer. Mute constant-temperature heating can be achieved through a structure without active flow guiding, it is avoided that continuous noise influences rehabilitation of a patient, and even heating can be achieved without a high-temperature heat source; high-quality fitting supporting can be achieved, the stress of a patient can be dispersed at any time, the efficiency of constant temperature acting on the patient can be synchronously improved through high-fitting-degree large-area fitting supporting, and the nursing quality and adaptability are further improved.

The invention relates to a long-distance water supply pipeline leakage detection device and method based on wave interference, and belongs to the technical field of water supply pipeline leakage monitoring. The equipment comprises a central control unit, a plurality of underwater sonar detection devices, a signal processing and communication unit and a pipe wall stress sensing unit, the method comprises the following steps: performing time synchronization on underwater sonar detection devices at all monitoring points, performing passive monitoring, monitoring continuous noise signals when leakage occurs, automatically triggering data packet transmission when a noise amplitude exceeds a threshold value, and performing preliminary positioning on a pipeline leakage point by a central control unit in combination with acoustic data and stress data, and judging a leakage risk level; after preliminary positioning, several monitoring points closest to the area are subjected to active detection, ultrasonic pulses are emitted, reflected waves are generated and received by an underwater sonar detection device, interference signals generated by obstacles are eliminated, and the accurate position of a leakage point is inverted by using delta d. According to the invention, long-distance and high-precision positioning of the leakage point of the pipeline can be realized.

The application provides an ice cover granular snow layer density estimation method and system based on a vehicle-mounted noise source, relates to the technical field of physical exploration and ice cover detection, and the method comprises the following steps: according to the exact start and end time period of each vehicle-mounted noise event, a corresponding multi-channel vehicle-mounted noise event data is obtained by intercepting from an original continuous noise record; the mutual coherence processing and linear superposition of the intercepted multi-channel vehicle-mounted noise event data are carried out to obtain a virtual shot record with improved signal-to-noise ratio; P wave and surface wave in the record are jointly inverted to obtain a P wave and S wave velocity structure, and on the basis, a double-parameter granular snow layer density formula fitting is carried out. The application is suitable for realizing the quantitative estimation of the regional scale ice cover granular snow layer density structure by using passive source seismic signals, and provides parameter support for ice cover engineering activity site evaluation and environmental evolution research.

The invention provides a denoising sequence recommendation method and system based on continuous subsequences, and belongs to the technical field of sequence recommendation denoising, the system is composed of an interest extractor and an iterative denoising device, and long-term and short-term interests of a user are accurately captured under the guidance of a target project through a dynamic division and representation fusion mechanism; long-term interest of a user is used as a supervision signal to guide a denoising process, and a noise subsequence deviating from user interest representation is identified through a dual judgment mechanism, so that continuous noise data in the sequence is accurately identified. According to the method, the problem that the long-term preference of a modeling user is inaccurate due to inherent noise in a user interaction sequence is solved, and meanwhile, the negative influence of continuous noise existing in context information in a denoising method based on the context information on denoising is solved.

The utility model discloses a floor type power distribution cabinet, which belongs to the technical field of power distribution cabinets, comprises a power distribution cabinet body, a noise reduction assembly, a connecting assembly and a sound insulation door, and is characterized in that the sound insulation door is rotatably connected to the power distribution cabinet body, the connecting assembly is arranged on the power distribution cabinet body and the noise reduction assembly, and the noise reduction assembly is arranged on the sound insulation door. The noise reduction assembly is connected to the power distribution cabinet body through the connecting assembly, so that noise generated during operation of the power distribution cabinet can be remarkably reduced, the influence on the surrounding environment and personnel is reduced, the working efficiency can be improved, fatigue and discomfort of the personnel caused by noise interference are reduced, and the safety of the power distribution cabinet is improved. The continuous noise may damage electronic components in the power distribution cabinet, and direct influence of the noise on equipment can be reduced, so that the service life of the equipment is prolonged, misoperation or safety accidents which may occur due to noise interference are reduced, and the safety is improved.

The utility model discloses a noise reduction garden fan, belongs to the field of garden fans, solves the problems that a noise reduction assembly is complex in structure and tedious in installation, and adopts the technical scheme that the noise reduction garden fan mainly comprises a machine shell and an airflow channel connected to the front end of the machine shell, and a driving motor and a fan which are used for forming airflow are arranged in the airflow channel; the inner wall of the air flow channel is provided with a noise reduction area which is annularly distributed, orthographic projections of blades of the fan on the inner wall of the air flow channel are located in the noise reduction area, a plurality of noise reduction hole grooves are formed in the noise reduction area, the air inlet end of the air flow channel is in a horn shape, and a plurality of continuous noise reduction steps are arranged on the inner wall of the air inlet end. The utility model is mainly used for reducing noise and simplifying the structure of the air flow channel at the same time.

The utility model belongs to the technical field of construction noise reduction, and particularly relates to a noise reduction device for building construction, the bottom of a sound insulation protection plate is fixedly connected with a bottom plate, the bottom plate provides stable support for the sound insulation protection plate, and a U-shaped plate is fixedly connected to one side of the sound insulation protection plate through an installation assembly. The connecting assembly is used for connecting the two adjacent sound insulation protection plates together with the connecting assembly, a continuous noise reduction barrier is formed, and mounting and dismounting are easy and convenient.

The noise reduction device comprises a rubber pad, a sound insulation layer is placed in the rubber pad, a plurality of sets of belt bodies are connected to the rubber pad, a plurality of sets of clamping blocks are connected to the belt bodies, a plurality of sets of clamping holes are formed in the rubber pad, and the clamping blocks are inserted into the corresponding clamping holes respectively. The rubber pad wraps the sound insulation layer, the sound insulation layer and the rubber pad are tightly attached to the pipeline through the elasticity and flexibility of the rubber pad, displacement can be prevented, continuous noise reduction is guaranteed, and the tightness can be adjusted according to needs. Moreover, compared with a glue fixing mode, the clamping block and clamping hole connecting mode greatly simplifies the replacement and maintenance process, glue residues do not need to be treated, a user does not need to worry about pipeline damage, and operation is easy and convenient.

The present invention discloses an inline rattling fish attractor that floats, added as a part to a fishing rig. The inline rattling fish attractor includes rattles inside that move to create sound and vibrations to attract fish to the rig. The rattles are positioned in strategic manner for creating rhythmic and continuous noise for attracting a lure. The trapped air creates a positively buoyant force underwater that lifts a fishing rig and bait off the bottom of a body of water.

The application discloses a speckle noise detection and removal method based on acoustic wave-laser cross-medium communication, which comprises the following steps: based on a dual-feature joint detection mechanism of kurtosis ratio and Teager energy operator, noise positions are identified and recognized through sliding window analysis; adaptive boundary expansion is performed on each detected noise position, and adjacent noise positions are merged to form continuous noise segments; two methods of bidirectional linear prediction and empirical mode decomposition are used to process the noise segments in parallel, and prediction signals of the noise segments are respectively generated; according to the local signal-to-noise ratio of the prediction signals and the boundary continuity, the fusion weights of the two kinds of prediction signals are respectively adaptively calculated, the two-way prediction signals are weighted and fused, and a fusion signal is obtained; through linear transformation, the end-point continuity of the fusion signal is matched, the smooth connection between the repaired segment and the original signal is ensured, and the speckle noise removal is completed. The application can detect and effectively suppress the speckle noise caused by dynamic water surface disturbance, and significantly improve the integrity and clarity of signal transmission.