31results about How to "Limit noise" patented technology

The invention provides a self-oscillation type high power LED constant-current drive circuit with low cost, high reliability and stability and high drive efficiency, the circuit comprises a rectifier and filter circuit, a switching circuit, a steady voltage constant current output circuit, a transformer, a self-oscillation type pulse width modulation signals generating circuit and a current feedback obstruction circuit, wherein the rectifier and filter circuit accesses commercial power into rectification, changes the commercial power into direct current, and then outputs commercial power to the switching circuit to switch in a self-oscillation type with high frequency, then high frequency voltage of the steady voltage constant current output circuit is transformed into direct voltage through the transformer to drive the LED, simultaneously sampling current signals produces jam signals through the current feedback obstruction circuit to control the switching circuit to work, the circuit does not adopt any driving chips and only uses fewer common individual devices to form a self-oscillation type structure to drive the switching circuit and to combine current feedbacks, which realizes constant current driving of the high power LED.

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 relates to a steam ironing appliance comprising a pressurized steam generator (102) and an iron (1). The iron (1) comprises an ironing base board (2) on which a body (4) is arranged. The body (4) is internally provided with a steam distributing loop. The steam distributing loop conveys the steam which is generated by the steam generator (102) to a steam discharging port (20) of the base board (2). The steam ironing appliance is characterized in that: the steam distributing loop comprises at least one expansion chamber (11,13); and the expansion chamber (11,13) comprises two projected connecting points (58,65) on two opposite surfaces.

Disclosed is a clothes dryer comprising a drum rotatably installed in a cabinet; a suction duct having a suction port for providing air inside the cabinet into the drum, and connected to the drum at one side of the drum; a suction fan arranged in the suction duct, for sucking air inside the cabinet through the suction port; and a suction guide extendingly installed from an outer circumferential surface of the suction port, for guiding air introduced to the suction duct. Thus, as the suction guide is installed at the suction port, it can be achieved to restrain a noise generation due to an air flow, to facilitate to cool a motor and to enhance an energy efficiency.

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.

Provided is an emergency escape device comprising: an exit cap which covers an inner circumference of an escape hole of a fire escape space on a corresponding floor of a high-rise building and is inserted from the top side to the bottom side of the escape hole; a guiding member which is provided vertically to the top / bottom sides of the exit cap; a dropping member which is positioned in a suspended state on a top side portion of the guiding member at a bottom side portion of the exit cap and drops along the guiding member; a descending member which enables the dropping member to descend at a constant speed along the guiding member; and a returning member which follows the guiding member and returns the dropping member to the original position. Preferably, the emergency escape device further comprises a locking member which maintains the position of the dropping member on the top side of the guiding member.

The invention relates to a low noise dry type arc suppression coil which comprises an iron core provide with not less than one air gap, an air gap backing plate, a coil, an upper cushion block, a lower cushion block, a pressing nail and a fastening bolt. A method to reduce the noise of the arc suppression coil is characterized by including the following steps: firstly, an iron core cake, an upper iron core yoke and a lower iron core yoke in an iron core stem are spliced and solidified together; secondly, the coil is sleeved on the iron core stem, and then the upper cushion block and the upper iron core yoke are placed on the iron core stem and then fastened by the fastening bolt, then reactance measurement is performed. The invention has the advantages that: firstly, not less than one holes are drilled on the air gap backing plate so as to make the air gap backing plate to be spliced and solidified with the iron core (cake) fully; secondly, the design of a beam makes the air gaps (epoxy glass-cloth laminate) evenly stressed when a machine body is fastened with the fastening bolt; thirdly, all the air gaps in the iron core stem, including the epoxy glass-cloth laminate, are solidified with the iron core effectively, thereby well limiting the noise of the dry type arc suppression coil.

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 relates to an electromechanical assembly comprising an electrical machine (20) coupled to a reduction gear (30), said electrical machine comprising a single bearing (40) at the rear. According to the invention, either the electrical machine or the reduction gear is equipped with a male shaft (33), while the other is equipped with a female shaft (23) mounted on the male shaft. In addition, the shafts have conical bearing surfaces (56, 59), and the assembly comprises an elastically deformable element (90) that biases the bearing surfaces axially relative to one another until they engage with one another.

The invention relates to a tyre tread comprising at least one block (3) of rubber material of width W and length L with L>>W. The block extends in a circumferential direction (X) when the tread (1) is mounted on the tyre, the block (3) comprising a contact surface (5) intended to come into contact with the ground and a first lateral wall (7) and a second lateral wall (9) delimiting this contact surface (5). The block (3) further comprises a plurality of sipes (11, 11a, 11b) opening onto the contact surface (5) of the block, each sipe (11) extending over the contact surface (5) in an oblique direction, opening onto the first lateral wall (7) and onto the second lateral wall (9), the sipes of the block being oriented in the same direction. The sipes (11) are spread over the contact surface (5) of the block in such a way that when a sipe (11a) reaches the second lateral wall (9) another sipe (11b) begins from the first lateral wall (7) at the same circumferential level (N) on the block, and each sipe (11) comprises at least two parts.

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.

A master cylinder (200) equipped with a brake fluid reservoir (20) connected by its neck (201) which, with the body (29) of the master cylinder, forms a chamber (24) connected by drilling (23) to the (primary or secondary) pressure chamber of the master cylinder through the holes (220) in the piston (22). The chamber houses an orifice plate (30) limiting the flow / rate of flow of brake fluid drawn into the chamber (222) as the piston (22) returns to its rest position.

The invention discloses an underwater color cast image sharpening method based on affine transformation. The method comprises the following steps: acquiring a reference image and a to-be-processed underwater image; respectively calculating the covariance of the reference image and the to-be-processed underwater image; constructing an affine transformation model and a target function, and obtaining a transfer coefficient by using a gradient descent method; obtaining an image after color correction according to the transfer coefficient and the affine transformation model; constructing an atmospheric scattering transmission model, obtaining an intensity value of global atmospheric light scattering and an intensity value of global atmospheric light, and obtaining transmissivity; and calculating an enhanced detail layer through a gradient enhancement function so as to obtain different scale detail layers of the image after color correction, and obtaining an image after contrast enhancement through an image synthesis function equation. According to the method, local color fidelity and gradient constraint terms are added into the proposed method, and various degraded images under various color cast and different illumination conditions can be processed.

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 invention relates to an electricity generator set comprising a casing (10) extending in a longitudinal direction; a combustion engine (3) mounted on the casing (10); an alternator (2) mounted on the casing (10) and connected to the said combustion engine (3) in order to be able to convert the energy received from the combustion engine (3) into electrical energy; a control and connection housing (1) connected to said alternator; at least one air intake aperture (6; 7)allowing air into said casing (10), characterized in that it comprises at least one air diffuser (4; 5) mounted on a side wall of said casing (10) between an air inlet aperture (6; 7) and said combustion engine (3).

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.