57results about How to "Implement noise reduction processing" patented technology

The invention discloses a voice signal acquisition device and method. The device comprises a laser interference measurement system, a sound receiving device and a processing system, wherein the laser interference measurement system is used for sending detection light to a vibrating surface of a target, receiving return light reflected from the vibrating surface of the target and obtaining a vibrating signal characterizing the surface vibration of the target through a mixing interference signal obtained by merging the return light and reference light; the sound receiving device is used for collecting sound on the direction of the target; and the processing system is used for performing calculation according to the vibrating signal to obtain a first sound signal frequency spectrum, performing calculation according to the signal collected by the sound receiving device to obtain a second sound signal frequency spectrum, and performing filtering processing on the second sound signal frequency spectrum through the first sound signal frequency spectrum, and performing restoration to obtain a sound signal generated by the target. By adoption of the voice signal acquisition device and method disclosed by the invention, noise reduction processing during the sound acquisition is realized. The interference of background noise can be reduced, and the sound of the target can be obtained more effectively.

The embodiment of the invention provides a sound denoising method and device, and relates to the technical field of audio processing. The method comprises the steps: obtaining first sound data of a current sampling point; obtaining second sound data, wherein the second sound data is the data collected at second sampling moments, the second sampling moments are a preset number of sampling moments before the first sampling moment and are the closest to the first sampling moment, and the first sampling moment is the sampling moment corresponding to the first sound data; carrying out the sliding smooth processing of the first sound data according to the second sound data; and determining the processed sampling data as the data after the denoising of the first sound data. According to the technical scheme of the embodiment, the method can remove the noise of an abrupt change type in a sound signal, and improves the sound quality.

The invention discloses an unmanned aerial vehicle image acquisition method, which relates to the technical field of unmanned aerial vehicles and comprises the steps of judging whether information that an unmanned aerial vehicle flies to a first preset position is received or not; generating a signal for controlling an infrared thermal imager or the visible light camera to shoot a picture of a preset size according to the day and night conditions when the signal is received; acquiring image data of the photographed picture with the preset size and acquiring a target outline according to the image data; calculating according to the outline of the target to obtain a geometric center value of the target; judging whether the geometric center value of the target is equal to the geometric centervalue of a shot preset-size picture sent by an infrared thermal imager or a visible light camera or not; if yes, controlling a scanning servo device to move according to the track, and meanwhile controlling a hyperspectral camera or the infrared thermal imager to shoot images and collect image shooting data; and performing noise reduction processing according to the acquired image shooting data to obtain a target clear image. The method has the advantages of high image acquisition precision and definition.

The embodiment of the invention discloses a respiratory signal extraction method and device, a magnetic resonance imaging system and a storage medium. The method comprises the following steps of: acquiring a first set number of points of pure respiratory modulated pilot tone signals received by a plurality of channels; carrying out eigenvalue decomposition on the basis of a covariance matrix, anddetermining a respiratory feature direction; acquiring a second set number of points of interfered pilot tone signals which are received by a plurality of channels and generate signal mutation when asequence of pulses runs; carrying out eigenvalue decomposition on the basis of a covariance matrix to obtain an eigenvector matrix, and determining an interference feature direction; for each pilot tone signal received by the plurality of channels, respectively utilizing the feature vector matrix to carry out orthogonal transformation to obtain a plurality of signals; and performing projection addition on the signals in the other feature vector directions except the signals in the interference feature direction in the respiratory feature direction to obtain a respiratory navigation signal. Visibly, respiratory signals accurately representing respiratory movements can be reproduced.

The invention discloses an in-car communication audio switching device and method. The device comprises a signal processing unit, a filtering unit and a noise reduction switch. The signal processing unit comprises an FPGA, a DSP digital signal processor, an AD conversion module and a DA conversion module. A communication device is connected with the FPGA in the signal processing unit through a synchronous serial port, signals in the communication device are sent to the FPGA through the synchronous serial port, the FPGA is respectively connected with the DA conversion module and the AD conversion module through the DSP digital signal processor, the filtering unit comprises an audio circuit module, the DA conversion module and the AD conversion module of the signal processing unit are connected with the PHONE end and the MIC end of a pair of earphones respectively through the audio circuit module, and the noise reduction switch is connected with the DSP digital signal processor. The in-car communication audio switching method improves the restrain effect of voice frequencies, sent to the earphones by the communication device, to noise or interferences, and has the advantage of being capable of improving the audio quality.

The invention discloses an adaptive wavelet threshold MEMS gyroscope noise reduction method based on maneuvering identification. The method comprises the following steps of: S1, establishing a maneuvering action identification model according to a dynamic Bayesian network method, and determining a maneuvering action currently executed by an aircraft; S2, establishing a maneuvering overload analysis model according to an error analysis method, and determining maneuvering overload data required by an MEMS gyroscope; and S3, establishing an overload-threshold adaptive model under each maneuvering action, and determining an adaptive wavelet noise reduction curve of the aircraft under different maneuvering actions and different overloads. According to the method, maneuvering identification is taken as a characteristic, the adaptive wavelet threshold method is taken as a signal processing method, noise reduction processing of the MEMS gyroscope is realized, and it is verified that the noise reduction effect of the gyroscope is remarkably improved with the method applied.

The invention discloses a cable monitoring system based on the Internet of Things. An insulation signal detected by an insulation detection module receives a cable joint insulation signal detected bya sensor through a preprocessor by means of amplitude limiting and a first differential filter, the signals enter a second differential filter and are counteracted with noise signals to realize noisereduction processing, wherein the noise signals are detected and output by the noise sensor, obtained by amplification of an amplifying circuit and half-wave rectification, and then subjected to buffering to filter out an abnormal high value; whether the cable joint insulation signal is abnormal or not is judged, the cable joint insulation signal is released to the ground when being abnormal, andthe cable joint insulation signal is subjected to amplitude-limiting amplification and then output when being normal, that is, the cable joint insulation signal is transmitted to an intelligent controller after being subjected to anomaly processing. Whether the cable joint mechanical abnormal information detected by a cable joint gap detection module or the current-carrying capacity information, which is detected by a current-carrying capacity detection module, of the cable joint is abnormal or not is the basis for judging whether the cable joint insulation signal is abnormal or not, and the insulation detection precision is improved.

The invention provides a motor and a method for controlling the motor to perform noise reduction. The motor comprises a pedestal, a stator iron core and at least two connecting pieces; wherein each connecting piece is connected with the pedestal and the stator iron core respectively, and the stator iron core is fixed in the pedestal. The rigidity of each connecting piece is adjustable, and adjustment is realized through external force acting on any one of the connecting pieces. According to the scheme, the rigidity of the connecting pieces of a motor is adjusted through external force, noise reduction processing can be carried out on the motor, and the implementation mode is simpler.

The invention discloses an optical fiber damage monitoring system by analyzing various environmental vibration signals. A central processing system is included. An input end of the central processingsystem is electrically connected with an output end of an environment monitoring system through a wire. The environment monitoring system comprises a vibration signal monitoring unit and an optical signal monitoring unit, the optical signal monitoring unit comprises an optical signal acquisition module, and the output end of the optical signal acquisition module is electrically connected with theinput end of a photoelectric conversion module through the wire. The invention relates to the field of an optical fiber communication technology. By using the optical fiber damage monitoring system byanalyzing the various environmental vibration signals, vibration signals and optical signals in various area environments covered by an optical fiber network can be collected, analyzed and judged, then a specific position of a fault point is calculated, maintenance personnel are informed to carry out rush repair at the first time, and a problem that the network is thoroughly interrupted due to afact that fibers in an optical fiber are finally broken is solved.

The invention provides a virtual reality system of an information security environment, and further provides a decryption algorithm of the virtual reality system. Denoising processing on voice signalnoise is achieved in the encryption and decryption process, and the defect that a traditional encryption algorithm cannot ensure the information security and the defect existing when a chaotic systemconducts encryption are overcome to a certain extent.

The invention discloses a cable monitoring system based on the Internet of Things. An insulation signal detected by an insulation detection module receives a cable joint insulation signal detected bya sensor through a preprocessor by means of amplitude limiting and a first differential filter, the signals enter a second differential filter and are counteracted with noise signals to realize noisereduction processing, wherein the noise signals are detected and output by the noise sensor, obtained by amplification of an amplifying circuit and half-wave rectification, and then subjected to buffering to filter out an abnormal high value; whether the cable joint insulation signal is abnormal or not is judged, the cable joint insulation signal is released to the ground when being abnormal, andthe cable joint insulation signal is subjected to amplitude-limiting amplification and then output when being normal, that is, the cable joint insulation signal is transmitted to an intelligent controller after being subjected to anomaly processing. Whether the cable joint mechanical abnormal information detected by a cable joint gap detection module or the current-carrying capacity information, which is detected by a current-carrying capacity detection module, of the cable joint is abnormal or not is the basis for judging whether the cable joint insulation signal is abnormal or not, and the insulation detection precision is improved.

Embodiments of the present disclosure disclose an audio noise reduction transmission method, device, electronic equipment, and computer-readable medium. A specific implementation of the method includes: acquiring the audio signal collected by the speech collection device; performing time-domain conversion processing on the above-mentioned audio signal to generate a time-domain waveform; performing spectrum conversion processing on the above-mentioned time-domain waveform to obtain an audio frequency spectrum; The audio spectrum is subjected to spectral feature extraction processing to generate spectral feature information; the above spectral feature information is input to a pre-trained audio extraction network to obtain a spectrum extraction result; the above spectral extraction result is subjected to noise reduction processing to obtain a noise-reduced audio signal. This embodiment implements noise reduction processing on audio, improves the noise suppression effect, and thus improves the audio transmission efficiency of the earphone.

The present invention provides a motor and a method for controlling the motor for noise reduction. The motor includes: a base, a stator iron core and at least two connecting pieces; each of the connecting pieces is connected to the base and the stator iron core respectively. The stator iron core is fixed in the base; the rigidity of each of the connecting pieces is adjustable, and the adjustment is realized by the external force acting on any one of the connecting pieces. In this solution, by adjusting the rigidity of the connecting piece of the motor by external force, the noise reduction processing of the motor can be realized, and the realization method is simpler.

The invention aims to solve a problem of noise during road repair and discloses a road repair noise reduction device for municipal road construction. The device comprises a support frame, wherein a connecting ring is fixedly connected to a top end of the inner side of the support frame, a top surface of the support frame is sleeved with a sliding plate, and a baffle is fixedly mounted at a lower end of the sliding plate; first spiral springs are symmetrically connected between the baffle and the supporting frame, sliding rods are sleeved with the first spiral springs, a first supporting plate is fixedly installed at a top end of the sliding plate, fixing rods are symmetrically installed on a left side face and a right side face of the supporting frame, and second supporting plates are fixedly installed at outer ends of the fixing rods; connecting plates are symmetrically installed in the first supporting plate and the second supporting plate, inserting rods are evenly and symmetrically installed between the connecting plates, surfaces of the inserting rods are sleeved with rotating cylinders, and a pull belt is connected between the rotating cylinders. Through a drawstring, the drawstring can be used for noise reduction, meanwhile, a refrigerator is used for cooling, and the comfort level of the working environment is improved.

The invention relates to a gear shifting inhaul cable noise reduction device which comprises a shell, a sealed part, a sliding part and a second connection part. A containing cavity is formed in the shell, and the end, in the axial direction, of the shell is fixedly connected with a first connection part. The sealed part is arranged in the containing cavity, and a sealed cavity filled with gas isformed in the sealed part. The sliding part is arranged in the sealed cavity so that the sealed cavity can be divided in the axial direction of the shell, and can slide in the axial direction of the shell, and through communicating holes are formed in the sliding part. The second connection part extends from the outer portion of the side, opposite to the first connection part, of the shell into the sealed cavity and is fixedly connected with the sliding part. By arranging the sealed part, when noise of a transmission is transferred through a gear shifting inhaul cable, the sliding part slidesin the sealed cavity due to the fact that the first connection part and the second connection part are connected with the inhaul cable, gas flows between the portions, on the two sides of the slidingpart, of the sealed cavity through the communicating holes, and then, noise reduction treatment on the noise is achieved.

The invention relates to a gear shifting inhaul cable noise reduction device which comprises a shell, a sealed part, a sliding part and a second connection part. A containing cavity is formed in the shell, and the end, in the axial direction, of the shell is fixedly connected with a first connection part. The sealed part is arranged in the containing cavity, and a sealed cavity filled with gas isformed in the sealed part. The sliding part is arranged in the sealed cavity so that the sealed cavity can be divided in the axial direction of the shell, and can slide in the axial direction of the shell, and through communicating holes are formed in the sliding part. The second connection part extends from the outer portion of the side, opposite to the first connection part, of the shell into the sealed cavity and is fixedly connected with the sliding part. By arranging the sealed part, when noise of a transmission is transferred through a gear shifting inhaul cable, the sliding part slidesin the sealed cavity due to the fact that the first connection part and the second connection part are connected with the inhaul cable, gas flows between the portions, on the two sides of the slidingpart, of the sealed cavity through the communicating holes, and then, noise reduction treatment on the noise is achieved.