4results about How to "Convenient projection" patented technology

This invention discloses a radio frequency (RF) activation method, apparatus, electronic device, and medium for an indoor distributed antenna. The method includes: performing three-dimensional local peak detection on target wall nodes of a target building to obtain target anchor points; projecting a two-dimensional continuous probability map, determined by superimposing parameter information of the target cores of all target anchor points, onto the target beam angular domain of each distributed antenna element to determine the coverage occupancy rate of each beam element in the target beam angular domain; allocating transmit power vectors to the target beam angular domain based on the coverage occupancy rate; determining the target RF chain for each beam element in the target beam angular domain based on the angular difference between two adjacent beam elements in the target beam angular domain; and transmitting the transmit power vector of the target beam angular domain and at least one target RF chain to the corresponding distributed antenna element in the target beam angular domain. This invention enables an indoor distributed antenna system to significantly reduce RF link power consumption while ensuring RF link quality.

The utility model provides a vehicle body top structure and a vehicle. The vehicle body top structure comprises a top cover cross beam and a damping structure arranged at the bottom of the top cover cross beam. The damping structure comprises an installation support and a damping assembly, the installation support is connected with the top cover cross beam, the damping assembly comprises a plurality of mass plates which are connected in a stacked mode, and one mass plate is connected with the installation support. According to the car body top structure, the shock absorption structure comprises the installation support and the weight reduction assembly, the shock absorption structure can be conveniently installed on the top cover cross beam through the installation support, good installation strength can be achieved, and vibration can be reduced; meanwhile, the damping assembly comprises the multiple mass plates which are connected in a stacked mode, and compared with a mass block structure, the damping assembly can be conveniently arranged in a small space, the machining cost can be reduced, and meanwhile noise generated by vibration of the vehicle body top structure can be effectively reduced.

The projection lamp for the automobile rearview mirror comprises a rear cover, the bottom end of the rear cover is movably provided with a projection lamp body, the surface of the top end of the rear cover is provided with two sliding grooves, hooks are movably installed in the sliding grooves, and the positions, close to the outer side, of the top end of the rear cover are provided with two lifting grooves. And lifting rods are slidably installed in the lifting grooves, supporting rods are fixedly installed at the top ends of the lifting rods, extrusion springs are movably installed between the bottom ends of the hooks and the interiors of the sliding grooves, and compression springs are movably installed between the bottom ends of the lifting rods and the interiors of the lifting grooves. Through the cooperation of the hooks and the supporting rods, when the hooks are hung on the surface of a rearview mirror fixing frame, the hooks can move towards the inner side under the elastic potential energy of the extrusion springs, so that the fixing frame is clamped between the two hooks, and then the supporting rods can be ejected upwards under the elastic potential energy of the compression springs to abut against the surface of the bottom end of the fixing frame; and the device can be mounted on rearview mirrors of different models.

The utility model relates to the technical field of audio and video system engineering, and discloses a projection device which comprises a projector body and further comprises supporting blocks which are arranged on the front and rear sides of the two sides of the bottom of the projector body and used for supporting the projector body, and a containing groove is formed in the front of the bottom of the projector body. A supporting plate is rotationally connected into the containing groove. The through groove is formed in the left portion of the containing groove, a gear is rotationally connected to the interior of the through groove, and the right side of the gear is fixed to a rotating shaft of the supporting plate; the movable groove is formed behind the through groove, and the interior of the movable groove is movably connected with a movable plate; according to the projector, the projector body can be supported, subsequent better projection is facilitated, meanwhile, the movable plate and the limiting clamping block can be driven to move together, the gear can be limited by the limiting clamping block, the rotation angle of the supporting plate is fixed, and the projector is suitable for projection at different positions.