8results about How to "Avoid howling" patented technology

The present application relates to the technical field of steam humidifier, and discloses a noise reduction structure of steam humidifier convenient to install and a use method, the noise reduction structure of steam humidifier convenient to install, including installation ring, both sides of the installation ring are fixedly connected with lower side plate, the inside of the lower side plate is provided with clamping groove, the side of the installation ring is hingedly connected with upper cover, both sides of the upper cover are fixedly connected with upper side plate, the opposite side of two installation plates is fixedly connected with support rod, the outer wall of the support rod is symmetrically slidably connected with sliding block, the opposite side of two sliding blocks is fixedly connected with spring one, the outer wall of the sliding block is slidably connected in the sliding groove, and the bottom of the sliding block is fixedly connected with clamping block.Under the reaction force of spring one, the sliding block is away from each other along the support rod, drives the clamping block to be away from each other and is clamped in the clamping groove, without using a variety of tools, and the installation of the upper cover can be completed only by simple operation.

The application provides an acoustic echo cancellation method and a Bluetooth intercom system, and is applied to a slave device in the Bluetooth intercom system. The method comprises the following steps: sending first voice data to a master device according to a current voice frame collected, wherein the first voice data comprises a voice identifier corresponding to the current voice frame, a device identifier of the slave device and encoded voice of the current voice frame; storing the current voice frame and the voice identifier corresponding to the current voice frame as local data in a local cache area; receiving second voice data sent by the master device, wherein the second voice data comprises a voice identifier associated with the device identifier of each slave device and encoded voice of multi-path combination; performing acoustic echo cancellation processing on the encoded voice of multi-path combination in the second voice data according to the second voice data and the local data, obtaining processed voice, and playing the processed voice, so as to improve the acoustic echo cancellation processing effect.

The application provides an air conditioner box air door structure capable of preventing howling and abnormal sound, comprising an air door shaft and an air door plate arranged on the air door shaft, the air door plate is integrally formed with the air door shaft, and a soft rubber sleeve is arranged on the air door plate; a plurality of equidistantly arranged trapezoidal blocks are arranged on the soft rubber sleeve, the trapezoidal blocks are made of the same material as the soft rubber sleeve, and the trapezoidal blocks are integrally formed with the soft rubber sleeve. The air conditioner box air door structure capable of preventing howling and abnormal sound can guide the air flow during the closing of the air door, so that the howling is avoided, the air door can be buffered when the air door is closed, the impact sound of the air door is avoided, and the user comfort is improved.

The invention relates to a parameter self-adjustment method and device, equipment and a storage medium. The method comprises the steps that mechanical open-loop characteristic parameters obtained after a first preset sweep frequency signal is injected into the drive control system are obtained, and the first preset sweep frequency signal is an incomplete open-loop sweep frequency signal; based on the mechanical open-loop characteristic parameter, obtaining an amplitude-frequency characteristic of the driving control system; and adjusting controller parameters of the driving control system based on the amplitude-frequency characteristics. According to the invention, the parameter adjustment time can be shortened and the accuracy of controller parameter adjustment can be improved.

The utility model discloses a pickup special for a seven-stringed plucked instrument, and belongs to the technical field of musical instruments. In order to realize interference-free sound amplification and avoid squeal, the sound pickup comprises a shell, a miniature capacitor pickup head is embedded in the shell, one side of the shell is provided with a through hole and a lead wire, the lead wire is used for penetrating through the miniature capacitor pickup head, and an end cover is arranged at the upper end of the shell and is used for completely sealing the shell. The inner wall of the housing 1 is provided with a conductive silver paint layer, and the conductive silver paint layer is connected with the ground wire end of the miniature capacitor pickup head 2 and is used for shielding electromagnetic interference.

The utility model relates to the technical field of electric appliances, in particular to a four-way connector, a drainage system, cleaning equipment and a cleaning system. The four-way connector comprises a main pipe, a first branch pipe and a second branch pipe. The main pipe comprises a first pipe opening, a second pipe opening and a third pipe opening, a separation part is arranged in the main pipe, and the first pipe opening and the third pipe opening are separated by the separation part; the first branch pipe is connected to the main pipe and is communicated with the third pipe orifice; the second branch pipe is connected to the main pipe and communicated with the third pipe opening. According to the technical scheme, the connecting structure of the pipeline system in the cleaning equipment is optimized, and the structural rationality of the cleaning equipment is improved.

The invention belongs to the technical field of power transmission, and discloses a transmission mechanism which is characterized in that at least one first screw channel arranged in the rotating circumferential direction is arranged in a first annular raceway, and at least one second screw channel arranged in the rotating circumferential direction is arranged in a second annular raceway; the rotor is clamped between the first annular roller path and the second annular roller path, the rotor is connected to the base body in a stopping and limiting mode in the circumferential direction of the first axis, the rotor has the rotational freedom degree along the axis of the rotor relative to the base body, and the transmission part is matched with the first screw path and the second screw path; when at least one of the first transmission part and the second transmission part rotates relative to the base body, the other transmission part is driven by the rotor to rotate. According to the invention, the meshing backlash caused by tooth-shaped transmission can be avoided, and the power transmission efficiency and stability are effectively improved. The invention further discloses a transmission assembly, a vehicle and a robot.

The utility model relates to an air duct assembly, an air conditioner indoor unit and an air conditioner unit, and the air duct assembly comprises a shell, a first opening is formed in the middle area in the first direction; the two centrifugal fans are arranged at the two ends in the shell in the first direction respectively, each centrifugal fan comprises a centrifugal fan blade, the central axis of each centrifugal fan blade is consistent with the first direction, and a fan inlet is formed in the end, along the central axis, of each centrifugal fan; the water receiving component is installed in the shell through the first opening, the water receiving component is of a cylindrical structure and extends in the first direction, the water receiving component is connected between the two centrifugal fans, flow collecting openings are formed in the two ends of the water receiving component and communicate with fan inlets in the same side, a second opening is formed in the side wall, close to the first opening, of the water receiving component in the second direction, and the second opening communicates with the fan inlets in the second direction. The second direction is perpendicular to the first direction; and the heat exchanger is arranged in the second opening and seals the second opening.