31results about How to "Limit noise" patented technology

The invention relates to an engine suspension cushion which comprises an upper framework, a lower framework, a damping component connected between the upper framework and the lower framework, a small bracket connected with the upper surface of the top part of the lower framework and a big bracket connected with the two sides of the lower part of the lower framework, wherein the upper framework is groove-shaped; the two sides of the opening part of the groove are respectively first turn-up sides; the two first turn-up sides are respectively provided with a first stud which is vertically connected to each first turn-up side; a forward stretching section is arranged at the bottom of the groove; a stud hole and a positioning pin hole are formed in the stretching section; the lower framework is inversely U-shaped, the left side surface is a left faying surface while the right side surface is a right faying surface; the lower framework corresponds to the stretching section at the bottom of the groove of the upper framework; a stud hole and a positioning pin hole are formed in the top part of the lower framework; the damping component comprises an upper mounting plate, a lower mounting plate and a rubber cushion block arranged between the upper mounting plate and the lower mounting plate for connection. The engine suspension cushion disclosed by the invention is light in weight, high in rigidity and good in vibration isolation effect, and can meet the requirements on NVH (Noise Vibration and Harshness) and reliability.

The invention discloses a TR (Transmitter and Receiver) assembly using MC1741 as a power amplifier. The TR assembly comprises a circulator, a switch limiter, an LNA (Low Noise Amplifier), a first filter, a first power amplifier, an attenuator, a TR changeover switch, a third power amplifier, a second filter, a limiter and a second power amplifier. According to the TR assembly disclosed by the invention, by adopting multiple amplification and multiple filter, the gain of signals is ensured while the SNR (Signal Noise Ratio) of the signals is ensured, and certain power is provided for follow-up signal analysis or signal transmitting; meanwhile, the noise coefficient and the gain of each amplifier are limited, and new noise is prevented from being brought in; meanwhile, the original gain which just needs to be subjected to primary amplification is divided into two stages, the noise coefficient is ensured while the amplification gain is amplified, and the purity degree of the signals is ensured.

The invention discloses a low-noise amplifier circuit TR (transmitter-receiver) component with a TA7505 double amplification structure. The low-noise amplifier circuit TR component comprises a circulator, a switch limiter, a low-noise amplifier, a first filter, a first power amplifier, an attenuator, a transmitter-receiver switch, a third power amplifier, a second filter, a limiter and a second power amplifier. By the aid of multiple amplification and multiple filtering, the signal-to-noise ratio of a signal is ensured, the gain of the signal is also ensured, a certain power is provided for subsequent signal analysis or signal transmission, a noise coefficient and the gain of each amplifier are limited, new noise is prevented, original gain only needing one-stage amplification is decomposed into two stages, the gain is amplified, and the noise coefficient and the purity of the signal are ensured.

The invention discloses a high-accuracy TR (Transmitter and Receiver) assembly using a simple LNA (Low Noise Amplifier) circuit. The high-accuracy TR assembly comprises a circulator, a switch limiter, an LNA, a first filter, a first power amplifier, an attenuator, a TR changeover switch, a third power amplifier, a second filter, a limiter and a second power amplifier. According to the high-accuracy TR assembly disclosed by the invention, by adopting multiple amplification and multiple filter, the gain of signals is ensured while the SNR (Signal Noise Ratio) of the signals is ensured, and certain power is provided for follow-up signal analysis or signal transmitting; meanwhile, the noise coefficient and the gain of each amplifier are limited, and new noise is prevented from being brought in; meanwhile, the original gain which just needs to be subjected to primary amplification is divided into two stages, the noise coefficient is ensured while the amplification gain is amplified, and the purity degree of the signals is ensured.

The invention discloses an LNA (Low Noise Amplifier) TR (Transmitter and Receiver) assembly using a superposition type amplifying structure. The LNA TR assembly comprises a circulator, a switch limiter, an LNA, a first filter, a first power amplifier, an attenuator, a TR changeover switch, a third power amplifier, a second filter, a limiter and a second power amplifier. According to the LNA TR assembly disclosed by the invention, by adopting multiple amplification and multiple filter, the gain of signals is ensured while the SNR (Signal Noise Ratio) of the signals is ensured, and certain power is provided for follow-up signal analysis or signal transmitting; meanwhile, the noise coefficient and the gain of each amplifier are limited, and new noise is prevented from being brought in; meanwhile, the original gain which just needs to be subjected to primary amplification is divided into two stages, the noise coefficient is ensured while the amplification gain is amplified, and the purity degree of the signals is ensured.

The invention discloses a class-D audio power amplifier, which comprises a charge pump device, which is configured to be capable of accessing a power supply voltage, boosting the power supply voltageto a boosting voltage, and outputting the boosting voltage to the input end of a low dropout linear regulator; and the low dropout linear regulator is configured to perform voltage stabilization operation on the boost voltage accessed through the input end of the low dropout linear regulator to obtain a stabilized output voltage, and provide the stabilized output voltage to the output power stage.According to the class-D audio power amplifier disclosed by the invention, the noise or signal-to-noise ratio of the output signal can be effectively reduced or at least limited while the output signal is amplified, and particularly, the adverse effect of charge pump ripples on system output can be reduced.

The invention discloses a remotely sensed image denoising method based on incremental dictionary learning. The pixel intensity of pixel blocks extracted from a target image and pixel blocks extractedfrom a reference image has a linear relationship to utilize the similarity of edge features, and finally the coefficients are obtained as a restriction condition for solving a final objective function. Based on the local incremental dictionary learning, the noise in the remote sensing image is removed by using the similarity of the edge features, which can keep the characteristics of the target image while effectively suppressing the noise.

The present invention relates to a device for purifying air in a cockpit which is arranged in the ceiling structure. The device comprises a housing (1) inside which an air flow (14) is circulated by a pulsator (6). The housing (1) comprises an air circulation channel (5) containing a plurality of air purification apparatuses (7, 8, 9, 10, 11, 17) of a specific type which are provided downstream from the pulsator (6) in the air flow (14) direction. The air circulation channel (5) includes an air inlet chamber (18) inside the housing (1) that contains the pulsator (6) and communicates with a plurality of secondary channels (12, 13) arranged in parallel relative to each other, wherein one at least of the secondary channels (12, 13) includes at least one air purification apparatus (7, 8, 9, 10, 11, 17).

The invention relates to a subassembly for securing a grid (10) of a loudspeaker (30) for the interior fittings of a vehicle, the subassembly comprising a wall (25) of a cover (20) defining a housing (219 for a loudspeaker (30) and a grid (10) covering the housing (21) comprising main elastic fixation means (11) that co-operate with the wall (25) of the cover (20), characterised in that the main elastic fixation means (11) co-operate with a first portion of the hosing (21) and in that the subassembly includes secondary retaining means comprising in a lower portion of the housing (21) separatefrom the first portion, at least one female fixation member (24) at least one male fixation member (13) is inserted.

The invention discloses a synchronous door moving door of a drive-by-wire automatic vehicle door. The synchronous door moving door of the drive-by-wire automatic vehicle door is characterized in that a base and a support are mounted on a whole vehicle frame, a synchronous rod is supported between the base and the support, a driving mechanism is mounted on the support and can move on the support, a first pin shaft is fixedly connected between the driving mechanism and a push rod, one tail end of the push rod is connected with the first pin shaft, and the other tail end of the push rod is connected with a second pin shaft; the second pin shaft is fixedly connected between the push rod and an upper swing arm, one tail end of the swing arm is fixed on the synchronous rod, the other tail end of the swing arm is fixedly connected with the second pin shaft, the upper swing arm axially rotates along with the synchronous rod, one tail end of the lower swing arm is fixed on the synchronous rod, and the other tail end of the lower swing arm is fixedly connected with a sliding rod; the lower swing arm axially rotates along with the synchronous rod, one tail end of a door carrying frame is fixed to the driving mechanism, the other tail end of the door carrying frame is fixed to a door panel, a sliding rail is fixed to the door panel, the sliding rod is mounted on the lower swing arm, and the outer ring of the sliding rod makes contact with the sliding rail and moves in the sliding rail. According to the synchronous door moving door of the drive-by-wire automatic vehicle door, the synchronous displacement function of the upper and lower ends of the door panel is achieved.

The present invention relates to a wiper blade apparatus for a vehicle, comprising: a main lever which is in a rod shape, formed of synthetic resin and has an arm coupling hole at a center thereof, wherein a wiper arm is coupled to the arm coupling hole; an auxiliary lever which is in a rod shape, formed of synthetic resin and coupled to an end of the main lever; a yoke member which supports a wiper strip and is rotatably coupled to the auxiliary level within a certain angle range with respect to the auxiliary lever; and a spacer member configured to enable the yoke member to be rotated within a certain angle range with respect to the auxiliary lever, wherein the spacer member is fixated to the auxiliary lever, the yoke member is rotatably coupled to the spacer member, and the yoke member is not directly in contact with the auxiliary lever; the yoke member comprises a pair of coupling holes passing through opposite sides of the yoke member and coupling projections which are protruded from the inner wall of the spacer member to each of the coupling holes and are rotatably contained in each of the coupling holes.