51 results about "Continuous noise" patented technology

A method for continuously monitoring noise exposure level of a person via measuring sound level within an ear canal of the person using a sound measurement means linked to a sound level recording device external to the ear canal, wherein the sound measurement means may be shielded from the environment by a hearing protective device, and wherein the cable does not interfere with the ability of the hearing protective device to reduce noise exposure level in the ear canal. Also provided are a system comprising a sound measurement means mounted within an ear canal of the person, an external sound level recording means and a linking cable. Further provided is a system for providing continuous noise exposure monitoring level of a person, and for providing radio communication in a noisy environment, said system comprising the above sound monitoring system linked to a radio signal transmission means, and is switchable between said sound level recording means in a recording mode and said radio signal transmission means in a communication mode.

Disclosed is a three-way call detection system and method for use with a telephone management system. Specifically, a three-way call detection system and method for detecting continuous noise indicative of an attempt to mask a three-way call attempt. The continuous noise detection system and method may be stand alone or used in conjunction with any existing three-way call detection system and method.

An ultra-wideband (UWB) communications system combines the techniques of a transmitted reference (TR) and a multiple access scheme called delay hopping (DH). Combining these two techniques using UWB signaling using a continuous noise transmitted waveform avoids the synchronization difficulties associated with conventional approaches. This TR technique is combined with the DH multiple access technique to create a UWB communications scheme that has a greater multiple access capacity than does the UWB TR technique by itself.

The invention provides a scalariform two-dimensional wide-band observation system design method improving the signal-to-noise ratio of a seismic prospecting imaging section. The method comprises the following steps: applying known seismic data and well data; investigating the apparent velocities and wave lengths of interference waves on the side face of an exploratory area; determining the minimum and maximum widths, the maximum receiving line interval and the receiving line number of an observation system as well as the element intervals of a geophone array; symmetrically combining geophones into basic units in the horizontal and vertical directions by taking receiving points as centers, wherein the transverse array lengths are equal to receiving line intervals, the vertical and horizontal array lengths are equal to track pitches, and the basic units are combined in a matching way in the vertical and horizontal directions according to the geophones. With adoption of the method, spatial continuous noise suppressing is realized, so that the effect that the receiving lines of the observation system unite to suppress noise horizontally is really realized, simultaneously the deficiency in spatial sampling is made up to, avoid alias noise, and improvement of the quality of a source material and the signal-to-noise ratio of the imaging section is facilitated.

Disclosed is a three-way call detection system and method for use with a telephone management system. Specifically, a three-way call detection system and method for detecting continuous noise indicative of an attempt to mask a three-way call attempt. The continuous noise detection system and method may be stand alone or used in conjunction with any existing three-way call detection system and method.

The invention provides a virtual outlier noise reduction method of micro-inertial device signals, which comprises the following steps: (1) for continuous signals with noise, intercepting fixed-length data quantity to be recorded as a sequence A; (2) carrying out symmetric extension on the sequence A to finish wavelet decomposition; (3) averaging wavelet functions after sequence decomposition, and computing signal variance; (4) computing the outlier, and eliminating a threshold; (5) carrying out noise reduction treatment on the wavelet functions by utilizing the computed threshold T; (6) repeating step (2) to step (5) until the number of the decomposed layers reaches the set value; (7) finishing reconstruction of the signals by utilizing the treated wavelet functions, and realizing noise reduction treatment on the signals at the intercepted section; and (8) repeating step (1) to step (7) to realize continuous noise reduction of the signals. When filtering the measured signals of a micro-mechanical gyroscope with the outlier and noise by aopting the method of the invention, oscillation near an outlier point is reduced, and a signal-to-noise ratio which is higher than that acquired by the universal threshold noise reduction method can be acquired.

Provided is an infrared-ray receiver for preventing the generation of the noise from the inner/external of the receiver. Pulse is generated in the input noise and signal. Distinguishing the noise andsignal by the pulse, thereby obtaining the quick attenuation of the noise and the adequacy time constant for the signal. When designing the integrate circuit, the infrared-ray receiver responds to theinput signal to charge and discharge in short time, therefore, the area of the integrate circuit can be reduced by insure adequacy time constant. Continuous noise source can be removed without usingoscillator in the chip, thereby keeping the infrared-ray receiver with high sensitivity. Furthermore, the quick charge relative to the continuous noise is reduced, thereby the time for generating error by the noise in the output can be reduced.

A noise reduction system is connected to at least two input channels for receiving input signals that have substantially identical program content but differing instantaneous noise transients. The system selects a filtered input signal that has the lowest instantaneous noise transient level. In another aspect, the noise reduction system removes instantaneous transient noise from an input signal by way of a blanker. The blanker includes a switch that opens whenever a band-pass filtered input signal is greater than the average level of the signal by a predetermined proportional amount. The input signal also includes continuous noise that is removed by a continuous noise suppressor. The continuous noise is removed by a low pass filter whose corner frequency is responsive to a differentiated input signal divided by the program component signal, or vice versa. In another aspect, the noise reduction system includes at least two of a switcher, blanker or continuous noise suppressor in connected in series to remove both instantaneous noise transients and continuous noise from an input signal.

The tinnitus testing apparatus of this invention comprises a control part that in turn comprises: an auditory stimulus generation part that can generate a stimulus; and an AEP acquisition and amplitude measurement part that can acquire auditory evoked potential (AEP) brain waves of a examinee due to said stimulus and measure the specific amplitude of said acquired brainwaves; wherein said auditory stimulus is one or more of: a 1st stimulus containing continuous noise and pulse noise; and a 2nd stimulus containing pulse noise and continuous noise with a silent gap.

A hearing protection device to be worn at either a primary position or a secondary position, comprising a hearing protection component and a noise measurement component, and an attachment mechanism to securely attach the noise measurement component to the hearing protection component, wherein at the primary position the noise measurement component detects a protected noise exposure and at the secondary position it detects an unprotected exposure, the noise measurement component comprises a microphone, a compartment that encloses the microphone and at least one filter, and the filter reduces resonance of said compartment incident upon said microphone.

The invention discloses a movable type intelligent noise continuous acquisition system for a transformer substation. The system comprises an acoustic measurement module, a video monitoring module, a measurement control module and a measurement data analysis module; the acoustic measurement module is used for acquiring noise time domain data through an acoustic testing device; the video monitoringmodule is used for recording corresponding noise equipment in real time during noise signal measurement through a video monitoring device; the measurement control module is used for controlling a mobile robot to walk according to routes and time so as to complete the continuous noise measurement of the transformer substation, wherein the routes and time are set according to the distribution conditions of the equipment of the transformer substation; the measurement data analysis module is used for extracting characteristic quantities corresponding to various kinds of information of the equipment in the transformer substation from the acoustic data of all measuring points and corresponding videos, generating a test data report and a noise sound source intensity display image according to thecharacteristic quantities, and drawing a transformer substation sound field distribution cloud diagram. With the movable type intelligent noise continuous acquisition system for the transformer substation of the invention adopted, the automation and intelligentization of noise monitoring are achieved; problems such as the finite point measurement of the transformer substation and inaccurate noisetransmission path judgment can be solved; and the problem that measurement time is limited by weather and operation conditions can be also solved.

The invention provides a target voice signal enhancing method based on continuous noise tracking, a system and a storage medium. The target voice signal enhancing method comprises the following steps:1, receiving a voice signal with noise, carrying out framing windowing processing on the voice signal with the noise, and carrying out short-time Fourier transform to obtain a relationship of a time-frequency domain; 2, estimating a noise power spectrum; 3, estimating a voice power spectrum; 4, estimating the voice signal by a voice estimator; 5, carrying out inverse Fourier transform, windowing,and achieving voice recovery by using an overlapping addition technique. The target voice signal enhancing method has the beneficial effects that a target voice signal is effectively separated, a noise residue in the voice signal is greatly reduced, and the quality of a target signal is greatly improved. The method has great significance for application such as automatic voice recognition, recognition on speakers, man-machine conversation interfaces and hearing aids.

An online strip steel CPC (center position control) audible-visual alarming system belongs to the technical field of strip steel production. The system comprises a CPC device, an S7400 PLC (programmable logic controller), a switch value output module, an audible and visual alarm, an upper monitor reset button, and relevant communication wires, leads, wiring terminals and the like. When deviation of the strip steel from a central line exceeds a preset deviation value, control commands are output by the S7400 PLC through the switch value output module, and audible alarm and visual blinking alarm are generated by the audible and visual alarm simultaneously to alert an operator to take process actions such as reducing speed, adjusting tension and the like, so that the strip steel can be led back to a normal position as soon as possible. A controllable button is further added to an upper monitor interface to improve system functions. The controllable button is used for resetting the audible alarm while the visual blinking alarm continues, so that form of an alarming function is diversified, the alarming function is enhanced, humanization is achieved, and continuous noise disturbance is avoided. The online strip steel CPC audible-visual alarming system has the advantages that shutdown rate of a whole production line due to overrun of the center position control can be reduced greatly, and the online strip steel CPC audible-visual alarming system has fine popularization and application value.

The invention relates to an oil and air hybrid driven lifting control device, which aims to solve the problems of large continuous noise, high energy consumption, oil temperature rise and the like during work of a normal hydraulic system. The oil and air hybrid driven lifting control device mainly comprises a pneumatic hydraulic pump, an oil tank, pneumatic reversing valves, a lifting oil cylinder, a pneumatic position sensor and an electromagnetic reversing valve, wherein an air inlet of the pneumatic hydraulic pump connected with the oil tank is communicated with an air source pipeline; the air source pipeline is connected in series with the electromagnetic reversing valve; a liquid outlet of the pneumatic hydraulic pump is communicated with an oil supply pipeline; the oil supply pipeline is connected in parallel with two pneumatic reversing valves; the two pneumatic reversing valves are connected with the oil tank respectively; the two parallel pneumatic reversing valves are correspondingly connected with the lifting oil cylinder respectively; and two pneumatic detection ports A and B of the lifting oil cylinder are correspondingly connected with a pneumatic position sensor. According to the oil and air hybrid driven lifting control device, a working table is slowly and stably lifted, and air is used as a power source to have the effects of saving energy and reducing consumption.

The Power Line Fault Locating System is a means of locating faults in a utility power system by sampling the noise at multiple positions around the system and correlating and summing the resulting data. When the processed data produces a spike, a noise source has been detected. The position of the spike in the data will indicate the location of the noise source with great precision. With three of more receivers the location of the fault can be determined in two dimensions. The invention can operate on both continuous noise resulting from minor flaws in the power system as well as the noise burst resulting from a power system failure. Noise resulting from minor flaws may come from slack line fittings, electrical leakage in insulators or at poles. A burst of noise may come from insulator flash over, lightning strike, or something contacting a power line.

The inventor found that the lightwave of a semiconductor laser includes, in addition to the laser oscillation lightwave, a weak, continuous noise component having a different wavelength (here, referred to as natural emission lightwave). The inventor also found that in the wavelength division multiplexing communication optical system in which signal lightwaves having a plurality of wavelengths are combined to transmit over a single optical fiber so as to be separated at the other end to receive with a plurality of light-receiving devices, the natural emission lightwave causes crosstalk. A natural emission lightwave-blocking filter that reflects a natural emission lightwave is placed on the optical path between the semiconductor laser and the optical fiber. The natural emission lightwave-blocking filter blocks the natural emission lightwave, preventing the crosstalk.

The invention discloses an NAND reference voltage measuring method, system and device, and a storage medium. The NAND reference voltage measuring method includes the steps: acquiring a voltage excursion interval of each overlap area of NAND and the initial reference voltage corresponding to each voltage excursion interval; for each overlap area, acquiring the number of the units in each voltage section in the overlap area, wherein the width of the voltage section is the width of the preset number of voltage excursion intervals; according to the number of the units and the initial reference voltage, determining the target reference voltage of the overlap area; and realizing accurate measurement of the voltage of the overlap area under the influence of the continuous noise of the NAND. Compared with the prior art, the NAND reference voltage measuring method solves the technical problem about how to solve the influence of the continuous noise on the NAND reference voltage to some extent.The disclosed NAND reference voltage measuring system and device and the computer readable storage medium can also solve the corresponding technical problem.

The invention relates to a channel continuous noise detection method and a channel continuous noise detection device. The channel continuous noise detection device comprises a computing unit and a judging unit, wherein the computing unit is used for generating a channel busy time maximum value according to a preset parameter list; and the judging unit is used for receiving the channel busy time maximum value and a channel busy time measured value to generate a noise interference alarm.