7results about How to "Reduce reverberation" patented technology

The invention provides a sound event classification method for reducing reverberation based on frequency band division, which can effectively reduce the influence of background noise such as reverberation and improve the accuracy of sound classification and recognition. A to-be-processed audio signal is converted from a time domain to a frequency domain to obtain a to-be-processed spectrum signal, the to-be-processed spectrum signal is subjected to frequency division ratio control of frequency band bandwidth and reverberation reduction of a selected frequency band to obtain a reverberation-reduced spectrum signal, and the reverberation-reduced spectrum signal is combined with other signals to obtain a finally-output spectrum signal after reverberation reduction. Converting the frequency spectrum signal into a time domain signal and outputting the time domain signal; a training set after data enhancement is formed based on a final output time domain signal, and a sound event classification model is trained, so that the characterization capability of the sound event classification model to features is indirectly enhanced.

The invention discloses a self-adhesive deadening felt which comprises a base material, a first deadening layer, a flame-retardant fiber layer, a microporous structure layer, a second deadening layer, an adhesive layer and a protective film layer which are stacked, the bottom of the deadening layer is connected with the top of the base material, and the top of the deadening layer is connected with the bottom of the flame-retardant fiber layer; the top of the second sound insulation layer is connected with the bottom of the density layer, the top of the flame-retardant fiber layer is in contact with the bottom of the microporous structure layer, the top of the second sound insulation layer is connected with the bottom of the adhesive layer, and the top of the adhesive layer is connected with the bottom of the protective film layer. And remarkable sound insulation, sound absorption and fire prevention effects are achieved. Firstly, the density layer can block sound waves of different frequency bands and remarkably reduce noise penetration, and the sound absorption layer adopts a porous structure, so that sound is effectively absorbed and attenuated, echoes and noise reflection in a space are reduced, and a quiet environment is created.

The utility model discloses a video dynamic interaction device with a directional audio transmission function, and relates to the technical field of video transmission application. The speech table comprises a speech table body and a first sliding groove formed in the speech table body. A microphone adjusting mechanism is arranged on the speech table body. The microphone adjusting mechanism comprises a plurality of angle adjusting assemblies, a fixing assembly, a sliding assembly, a distance adjusting assembly and a spiral assembly, the microphone angle adjusting assembly comprises a rotating shaft arranged in a first sliding groove, a connecting plate is fixedly installed at the top end of the rotating shaft, and a first connecting block is fixedly installed at the top end of the connecting plate; a second connecting block is installed on the first connecting block in a hinged mode. Through the microphone adjusting mechanism, the problems that the use of a user is inconvenient, the user needs to bend down or stand at a specific position to interact with equipment, the use experience and comfort of the user can be influenced, and the sound quality and definition can be influenced when the microphone is too far or too close to the microphone are solved.

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 invention discloses a new energy automobile vehicle-mounted voice assistant installation stabilizing structure based on a lightweight framework. Comprising a central control panel, a main driving instrument board fixedly installed at one end of the central control panel, a co-driving box board fixedly installed at the other end of the central control panel, a co-driving sealing cover board installed at the top of the co-driving box board through an adhesive and located at the same height as the central control panel, and a main driving instrument board installed on the co-driving instrument board in a clamped mode. And an instrument cover plate is arranged at the top of the central control panel and the co-driver sealing cover plate. And auxiliary display screens are fixedly mounted on the central control panel, the main driver instrument panel and the co-driver sealing cover plate. A voice assistant recognition electric control assembly is installed in the auxiliary display screen. A center console is fixedly installed on the front face of the center control panel, and a sealing box body is integrally installed at the position, opposite to the center console, of the center control panel. And a radio array assembly is fixedly mounted in the sealed box body. The method has a certain directional sound receiving effect, so that the recognition accuracy of a voice assistant is ensured, and the sound signal conversion accuracy is also ensured.

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.