3results about How to "Reduce reverberation" patented technology

This utility model relates to a sound pickup channel, specifically disclosing a microphone sound pickup channel for a Bluetooth headset. It includes a housing with a cavity formed within it. The sound pickup channel is located on the housing, with one end connected to the outside and the other end connected to the cavity. A microphone is located at the other end of the sound pickup channel. The cross-section of the sound pickup channel is bent. The bent sound pickup channel of this utility model can reduce wind noise interference; it can reduce ambient noise reflection; it can enhance active noise cancellation; and it can improve the durability of the microphone.

The utility model discloses a food processing machine with a good damping effect, which relates to the field of life electric appliances and comprises a machine base internally provided with a motor and a smashing cup detachably arranged on the machine base, a smashing device in transmission connection with the motor is arranged in the smashing cup, and a water tank communicated with the smashing cup is further arranged on the machine base. The machine base comprises a machine shell, a mounting part is arranged on the inner wall of the machine shell, the water pump is further sleeved with a flexible part, and the water pump is fixed to the mounting part through the flexible part, so that vibration generated in the working process of the water pump is effectively absorbed, transmission of the vibration to the mounting part is effectively reduced, and then vibration of the whole machine shell is reduced; the resonance phenomenon in the working process is avoided, the stability of machine operation is improved, meanwhile, flexible isolation of the water pump and the machine shell is achieved through the flexible piece, and therefore the situation that the water pump directly collides with the installation part to generate collision noise when working is effectively avoided, noise reduction is achieved, and the noise reduction effect is improved.

The application discloses a multi-environment noise suppression device and method for chassis dynamometer test of an automobile. The device comprises a test bin, a sunken bin is arranged under the ground of the test bin, a dynamometer platform is arranged in the sunken bin, a plurality of sound insulation boards are arranged on the bottom wall of the dynamometer platform, a track is arranged in the sunken bin along the length direction of the sunken bin, a dynamometer device is arranged on the track, the dynamometer device at least comprises a pair of rotating hubs for contacting with tires of an automobile to be tested, a sealing sound insulation assembly is arranged on the dynamometer platform and is in contact with the rotating hubs, and a plurality of movable sound absorption assemblies are arranged on the track at intervals. In the scheme, the dynamometer device is arranged in an underground space, noise radiated to the space above the ground is reduced by using sound insulation of the underground space, the upward diffusion of the noise is blocked by the sound insulation boards, the movable sound absorption assemblies are arranged flexibly near the noise source, the rotating drum and the transmission mechanism are wholly covered in the multilayer sound insulation structure, and the upward propagation path of the noise is cut off.