32results about How to "Suppress wind noise" patented technology

A directional microphone includes a housing, a diaphragm dividing the housing into a front volume and a back volume, electronics for detecting signals corresponding to movements of the diaphragm, and front and back inlets for the front and back volumes, respectively. To obtain additional low frequency roll-off in the directional microphone, the directional microphone includes an elongated acoustical conduit connecting the front volume and the back volume. The acoustical conduit may be external or internal to the housing.

A side wall of a centrifugal fan includes a gap expanding portion arranged to gradually expand a gap between an impeller and the side wall from an upstream end toward a downstream end with respect to a rotation direction of a rotating portion. In the centrifugal fan, an electronic component arranging portion of a board is arranged in an area surrounded by the gap expanding portion, the impeller, and an air outlet, and accordingly does not overlap with a motor or the impeller in an axial direction. The electronic component arranging portion is arranged in an area extending, in a circumferential direction about a central axis, from a position 180 degrees upstream from a middle of the air outlet downstream to the middle of the air outlet, that is, in an area where a wind channel has a large width.

A narrow directional microphone includes a unit case having a front end portion to which a microphone unit is mounted, and a side surface functioning as a grip, an acoustic tube formed of resin material in a tubular shape, covering the microphone unit, and attached to the front end portion of the unit case such that the microphone unit is positioned to an inner bottom portion of the acoustic tube, a piezoelectric film that is arranged in at least one part of the acoustic tube, and that generates a detection output based on a mechanical deformation of the acoustic tube, and an output signal processing unit including an attenuation circuit that attenuates an audio signal from the microphone unit with the detection output from the piezoelectric film and sends the attenuated audio signal to a signal output unit.

A hearing aid (100) having a microphone, a signal processing unit, an electrical-acoustical output transducer, a housing (101) and a wind shield cover (102) wherein the housing has a surface with a microphone inlet (112, 113), and the wind shield cover is adapted to be attached to the housing, to cover the microphone inlet, to provide for sound to be guided in a gap between the wind shield cover and the housing, hereby providing for the transmission of sound from the surroundings and to said microphone inlet, wherein a first dimension of a cross-section of the gap is in the range between 0.15 mm and 0.5 mm, and wherein the minimum distance, along the gap, from the microphone inlet and to the opening of the gap, towards the surroundings, is at least 1 mm.

A vehicle door (10) has a door body (20), a stationary window panel (17) which is provided above the door body (20), a panel support frame (50) which is provided at at least the lower edge of the stationary window panel (17) and which seals between the lower edge and the door body (20), and a decorative belt line molding (30) which is provided at the upper edge of the door body (20) so as to extend therealong. The panel support frame (50) and the belt line molding (30) overlap each other in the thickness direction of the door. The panel support frame (50) has a first support frame-side extension section (54a) which extends in the thickness direction of the door relative to the stationary window panel (17) toward the belt line molding (30). The belt line molding (30) has a design surface section (31) which constitutes the outer surface of the vehicle, and a molding-side extension section (32b) which extends from the design surface section (31) in the thickness direction of the door toward the stationary window panel (17). The molding-side extension section (32b) overlaps the first support frame-side extension section (54a) in the vertical direction.

The invention provides a dual-speaker headphone comprising a hollow shell, a bass passive radiator located in the shell, a tweeter and a woofer. The tweeter is opposite to the woofer. An inner cavity of the shell is divided into a front cavity for accommodating the tweeter and a rear cavity for accommodating the woofer by the bass passive radiator. The structure edge of each of the woofer and the tweeter is provided with a smooth surface, and a sound surface of each of the woofer and the tweeter faces the outside of the shell. A conical diffuser is disposed in front of the back of the woofer while another conical diffuser is disposed in front of the sound surface of the tweeter. As to the part of the shell, used for forming the rear cavity, the area corresponding to the sound surface of the woofer is in a mesh enclosure structure, and the area connected with the bass passive radiator is provided with a pressure-equalizing inverter hole or pressure-equalizing inverter tube. An independent sound cavity provided with a pressure-equalizing inverter hole or pressure-equalizing inverter tube is further formed in the front cavity. The tweeter is located in the independent sound cavity. The dual-speaker headphone is capable of inhibiting wind noise and standing wave, so that sound pressure balance is improved and eardrum stress is relieved.

A microphone unit which can suppress collection of wind noise and minimize or eliminate digital signal processing has at least a microphone, a first acoustic transmissive material, and a second acoustic transmissive material, the first acoustic transmissive material is a fiber material in which fibers are intertwined with each other, the second acoustic transmissive material is a mesh-like member or a porous member having a plurality of holes, and the microphone is configured to be protected by the first acoustic transmissive material and the second acoustic transmissive material in this order.

Wind noise is suppressed while an air-blowing performance is maintained.An indoor unit 1 of an air conditioner includes a cross flow fan 10 and a rear guider 20 and a stabilizer 32 which are provided on the respective sides of the outer periphery of the cross flow fan 10 to form an air passage. Each of the rear guider 20 and the stabilizer 32 has, at least at a part in the axial direction which part is on the leading end side, twisted portions 23, 37. In the circumferential direction of the cross flow fan 10, each twisted portion 23, 37 is deviated from the axial direction of the cross flow fan 10 gradually from one end to the other end.

An unmanned air vehicle is provided. The unmanned air vehicle includes one or more generators, each of which generates a force that drives the unmanned air vehicle to fly and also generates an airflow. Each of one or more first microphones is located in an external region that is not included in any of one or more first airflow regions. Each of the one or more first airflow regions corresponds to the airflow generated by one of the one or more generators. Each of one or more second microphones is located in the external region between at least one of the one or more generators and the one or more first microphones. A processor performs processing on one or more first signals output from the one or more first microphones and one or more second signals output from the one or more second microphones.

The invention provides a skylight noise reduction assembly which comprises a front assembly, a rear assembly and a control unit. The front assembly comprises a front plate and a front driving mechanism. The rear assembly comprises a rear plate and a rear driving mechanism. The front driving mechanism and the rear driving mechanism are connected with the control unit. The front end of the front plate is connected with the front driving mechanism arranged at the front end of the inner edge of a skylight, and the rear end of the front plate can be overturned up and down under the action of the front driving mechanism; The rear end of the front plate can adhere to the end face of the front end of the rear plate, and the rear end of the rear plate can adhere to the rear end edge of the inner side of the skylight. The invention further provides a method for determining an optimal opening of the skylight noise reduction assembly. The skylight noise reduction assembly has the advantages that the opening of the front plate and the opening of the rear plate can be automatically adjusted according to concrete conditions of a vehicle; when the skylight is opened, the front plate changes the wind eddy dropping direction and position; if the rear edge of the front plate is in a sawtooth shape or a wave shape, dropping of a wind eddy can be avoided, and noises are reduced.

A blow-off device (10) is equipped with a wind direction variable means (40) and a pressure adjustment unit (60) in a ventilation passage (50). The wind direction variable means is rotatably provided in the ventilation passage and can change a conditioned air from the inflow port (50c) toward a blow-off port (50d) and a second inclined part (52r) along an intermediate part (53r). The pressure adjustment unit prevents the pressure of the ventilation passage from exceeding a predetermined value by releasing the conditioned air to the outside of the ventilation passage. A bypass inlet (66) of the pressure adjustment unit is provided on an upstream side of an end portion (42d) in a +X direction at the time of maximum rotation of the wind direction variable means.

The car door (10) has: a car door body (20); a fixed window panel (17), which is arranged on the top of the car door body (20); a panel support frame (50), which is arranged on at least the lower edge of the fixed window panel (17) part and seal between the lower edge and the door main body (20); and a decorative waistline trim (30), which is arranged on the upper edge along the upper edge of the door main body (20). The panel support frame (50) overlaps with the waistline trim (30) along the thickness direction of the car door. The panel support frame (50) has a first support frame side extension portion (54a), and the first support frame side extension portion extends along the thickness direction of the door toward the waistline trim (30) relative to the fixed window panel (17). The wire trim (30) has a design surface (31) constituting the surface on the outside of the vehicle, and a trim side extension (32b) extending from the design surface (31) toward the fixed window panel (17) in the thickness direction of the door. The frame-side extension (32b) overlaps the first support frame-side extension (54a) based on the vertical direction.

The invention provides an external sensor attachment portion structure. In an external sensor attachment portion structure of the present invention, an external sensor (25) includes: a sensor main body (33) including a detection unit that detects external information; a sensor attachment bracket (35) used to attach the sensor main body to a vehicle body frame member; and a sensor garnish (37) including a window portion through which the detection unit is exposed in front view. The sensor garnish is provided on an outer side of the host vehicle so as to expose the detection unit of the externalsensor and cover the sensor main body and the sensor attachment bracket excluding the detection unit. Small gaps are provided between the sensor main body and a window frame of the window portion inthe sensor garnish. The window frame includes a noise suppression portion that suppresses wind noise due to airflow passing through the gaps along a rearward direction of the host vehicle.