41results about How to "Suppress disturbing noise" patented technology

A loudspeaker arrangement in a motor vehicle includes at least one loudspeaker, which is able to be driven by an audio processor, the loudspeaker being arranged as at least one electrostatic planar loudspeaker.

The invention relates to a measurement device (1) for ascertaining a measure and of a measurement gas (2) by means of a photoacoustic method. The measurement device (1) has a flow channel (3) for themeasurement gas (2) with at least one supply line (4), a photoacoustic measurement cell (5), and an outlet line (6). The measurement device (1) has at least one acoustic filter element (8) coordinatedwith the fundamental frequency (18) of the measurement cell (5), which filter element comprises at least one cavity resonator (7) arranged on the flow channel (3).

The present invention provides a method and system for visualizing fetal heart rate data of a multi-dimensional channel sensor, including: collecting multiple dimensions of fetal heart signal data through a multi-dimensional channel sensor; projecting the fetal heart signal data into one-dimensional, two-dimensional or Three-dimensional space; the projection includes any one or more of the following: projection, clustering, principal component analysis and integral processing. The invention uses a multi-dimensional channel sensor to suppress interference noise, increases the amount of measured information, and uses dimensionality reduction information to visually display information. The use of dimensionality reduction information can not only simplify the display of existing information, but also dig out the information hidden in the data before. For example, the projection of space dimension and frequency dimension will display fetal movement, fetal position and other information.

The invention discloses a precise simple-pendulum type relative gravity meter. One pendulum rod or two suspension fibers are connected with a cross beam, the lower portion of the pendulum rod or the lower portions of the suspension fibers are connected with a pendulum mass, and then a simple-pendulum system is formed. A support supports the simple-pendulum system through wear-resisting contacts on the cross beam. The stability of the environment where the simple-pendulum system is located is kept through a vacuum cavity, a temperature control system, an electrostatic shielding case and a damping base, equivalent pendulum length fluctuation is reduced, and therefore high-stability low-loss simple pendulum movement is achieved. A pair of capacitor displacement transducer polar plates are arranged over the pendulum mass and a pair of capacitor displacement transducer polar plates are arranged under the pendulum mass. The capacitor displacement transducer polar plates and the pendulum mass form a variable-area capacitor displacement transducer together, wherein the variable-area capacitor displacement transducer is used for measuring real-time displacement of the pendulum mass. A first oscillation starting and pendulum locking displacement executing machine and a second oscillation starting and pendulum locking displacement executing machine are installed on the two sides of the pendulum mass respectively, and therefore an oscillation starting and pendulum locking mechanism for simple-pendulum motion is formed. The precise simple-pendulum type relative gravity meter is simple in structure, convenient to use, beneficial to maneuvering observation and capable of achieving measurement of simple-pendulum type relative gravity on the level of the resolution of 0.1mgal.

The invention relates to a ten-gigabit transfer connector with filtering function, which comprises a plastic shell, the plastic shell includes a first shell and a second shell, and the sides facing each other of the first shell and the second shell are respectively provided with A female head and a male head that can be buckled with each other. Two ferrules that conduct signals are arranged in the plastic shell. The ferrules include stamped terminals inside the ferrule. The side is integrally connected with two buckle points, and the two buckle points are distributed on both sides of the ferrule. The ferrule is connected through the connecting terminal. One end of the terminal is set in a ladder shape, and the plastic shell is provided with a limit slot for sliding of the limit rod. The invention has the advantages of ensuring the signal integrity after twisted-pair splicing and extension, and being compatible with Category6 and Category5E downwards.

The invention discloses a non-sinusoidal random SVPWM modulation method for a five-phase inverter, belonging to the technical field of multi-phase motor drive control. The present invention selects two large vectors and two medium vectors surrounding the sector to which the fundamental wave reference voltage vector belongs to synthesize the fundamental wave reference voltage vector; The voltage vector synthesizes the third harmonic reference voltage vector; when calculating the vector action time, in each sampling period, keep the sampling period unchanged, randomly delay the PWM pulse and randomly assign two zero vector action times to achieve switching frequency and zero Double randomization of vector action times. The method disclosed in the present invention can linearly superimpose the torque components generated by the fundamental wave current and the third harmonic current when driving the motor, thereby increasing the torque density of the system, and greatly reducing the high The amplitude of the sub-harmonic wave can suppress electromagnetic interference and high-frequency noise, and improve the electromagnetic compatibility of the system.