38results about How to "Reduce sound leakage" patented technology

The first signal not higher than a predetermined frequency is output to a subwoofer out of the multichannel reproduction signals supplied from a sound source and, at the same time, the second signal higher than the predetermined frequency is output to a plurality of non-closed type headphones and the signals are processed for each of the channels corresponding to a plurality of headphones, considering links of the low tones to be output from the subwoofer according to the first signal and medium to high tones to be output from the plurality of non-closed type headphones according to the second signal.

The present invention provides a soundproof cover comprising: a sound-absorbing material having air permeability; and a skin material impregnated with a viscoelastic material and having air permeability, wherein the skin material is provided on a surface of the sound-absorbing material opposite to a sound source, and wherein the soundproof cover has a three-dimensional shape corresponding to an outer shape of the sound source.

The invention relates to a mobile terminal, a control method thereof and a storage medium, and belongs to the field of electronic technology application. The mobile terminal comprises a shell, a control assembly and a piezoelectric excitation assembly arranged in the shell, the piezoelectric excitation assembly can generate a piezoelectric effect, and the piezoelectric excitation assembly comprises a first excitation source and a second excitation source arranged around the first excitation source. The control assembly is configured to control the first excitation source to emit first vibration driving force when the mobile terminal is in a telephone receiver mode, and control the second excitation source to emit second vibration driving force, so that at the position of the second excitation source, the vibration direction of the first vibration wave generated by the first vibration driving force is opposite to that of the second vibration wave generated by the second vibration driving force, and the vibration amplitude of the second vibration wave is smaller than or equal to that of the first vibration wave. The sound leakage phenomenon is reduced.

There is provided a piezoelectric device for generating an acoustic signal in which an expansion mechanism expands a disposition of a laminated piezoelectric actuator by the principle of leverage. The mass of a base member placed in the expansion mechanism is larger than the mass of a vibration output member. An overall device size is small. The piezoelectric device has a pressurization structure for reducing a tractive force acting on the laminated piezoelectric actuator which is generated by the amplification. This enables provision of a piezoelectric device for generating an acoustic signal that is a small size, highly resistant to dropping impact, and has god acoustic performance with less sound leakage.

A reproducing apparatus includes: a connecting part which is connected to an audio signal output apparatus through the three pole terminal; a storage part which stores content data including first and second channel audio data; a reproducing part which reproduces the content data; a first converting part which converts the first channel audio data included in the content data reproduced by the reproducing part into the first channel audio signal; a second converting part which converts the second channel audio data included in the content data reproduced by the reproducing part into the second channel audio signal; and a measuring part which measures at least any one of an amount of sound leakage in the second output unit caused by outputting the first channel audio signal and an amount of sound leakage in the first output unit caused by outputting the second channel audio signal.

The invention discloses a sound insulation system, a passenger room door, a guide groove of a rail traffic vehicle and the rail traffic vehicle. The sound insulation system comprises a vehicle door and the guide groove. The bottom of the vehicle door is provided with a groove. The guide groove is provided with a sunken part matched with the bottom of the vehicle door in width. The sunken part is internally provided with a protruding strip matched with the groove in shape and size. The portion, between the top end of the protruding strip and the vehicle door, of the groove and the space between the bottom end of the vehicle door and the sunken part on the sides of the protruding strip are filled with sound absorption materials. According to the sound insulation system, three sound absorption structures are arranged on a sound passing path; sound waves go into the sound absorption materials through small holes of pore plates, sound energy is consumed a lot, sound leakage can be greatly relieved, and the sound insulation property so the vehicle door is further improved.

The present invention provides a soundproof cover comprising: a sound-absorbing material having air permeability; and a skin material impregnated with a viscoelastic material and having air permeability, wherein the skin material is provided on a surface of the sound-absorbing material opposite to a sound source, and wherein the soundproof cover has a three-dimensional shape corresponding to an outer shape of the sound source.

The invention mainly relates to a loudspeaker assembly, a sound production device and a gauze element assembly. The loudspeaker assembly comprises a loudspeaker shell body, a bone conduction loudspeaker and a protective gauze element, wherein an accommodating cavity with an opening is formed in the loudspeaker shell body; the bone conduction loudspeaker comprises a vibration assembly and a vibration transmission plate, the vibration assembly is accommodated in the accommodating cavity, and the vibration transmission plate is connected with the vibration assembly and exposed through the opening; the protective gauze element comprises an attaching part, a cylindrical containing part and an annular supporting part, the vibration transmission plate is arranged in the cylindrical containing part, the attaching part is used for blocking one end of the cylindrical containing part and is attached to the outer end face of the vibration transmission plate, the annular supporting part is connected to the other end of the cylindrical containing part and extends towards the outer side of the cylindrical containing part, and the annular supporting part is supported on the opening end of the loudspeaker shell body. Through the above mode, the sound leakage of the loudspeaker assembly can be reduced.

An electromagnetic valve device for reducing noise resulting from an internal collision of a movable core against a guide member has a fixed core, a cylindrical movable core, a valve member, for reciprocating in an axial direction of the movable core in a cooperative manner with the movable core to open and close fluid paths, coil sections for forming a magnetic field by electrical conduction thereof to attract the movable core to the fixed core so as to move the movable core in the axial direction, and a guide member having a guide wall for guiding the movable core in the axial direction from inside of the movable core in its radial direction. A space is formed inside the guide wall in its radial direction.

The invention discloses a metal silencing hood for a pipeline of a petrochemical device, which relates to the field of industrial noise abatement, in particular to a metal silencing hood for abating noise of delivery pipelines in the petrochemical industry. The metal silencing hood mainly comprises a metal sound insulating board, a metal fiber felt, inorganic fibrous sound-absorbing cotton, a metal protective net and a damping layer, wherein the damping layer, the metal fiber felt and the inorganic fibrous sound-absorbing cotton are sequentially arranged on the inner wall of the metal sound insulating board, and the metal protective net is arranged outside the metal sound insulating board and mounted outside the pipeline of the petrochemical device together with the metal sound insulating board. The metal silencing hood has fireproof, flame-retardant and explosion-proof performances and quite high sound insulation, can be conveniently detached in daily maintenance and outage for maintenance in the petrochemical industry, and can be conveniently reinstalled.

A golf car includes an engine and a shroud that covers a cylinder body. The shroud communicates with a muffler cover, which covers a muffler. A silencer is provided at an outlet of the muffler. An elastic exhaust duct is connected to an exit end portion of the muffler cover. An undercover is located lower than the engine, and defines an underside of an engine room. The undercover includes an opening at a more rearward position than the muffler in a side view. The exhaust duct is routed above the undercover, includes a rearward end portion at the opening, and is fitted to the opening. Holders hold sound absorbing members on an inner circumferential surface of the exhaust duct.

The invention relates to a soundproof door framework, and in particular relates to a detachable soundproof door framework. The detachable soundproof door framework is composed of a support framework, a fixed sealed module, a detachable seal module and a lock body with a plug pin, wherein the support framework is welded by square steel or angle steel to form a rectangular framework, and the inner side of the support framework is welded on the edge frame of the door framework; the outer side of the support framework extends into a building wall of a door opening; the fixed sealed module is composed of a concave curve surface panel, a fixed module end surface panel and a fixed module arc panel and is welded integrally with the support framework; the detachable sealed module is composed of an inner side plate, a convex curve surface plate, a detachable module end surface panel and a detachable module arc panel and welded integrally; and the detachable sealed module is locked tightly with the door framework after being inserted into the fixed sealed module, and a test wire cable can be installed into the round opening of the detachable soundproof door framework, thereby reaching the aims that structure is compact, detaching is convenient, appearance is beautiful, and sealing soundproofness are achieved. The detachable soundproof door framework provided by the invention can be widely applied to engine laboratories and other acoustic testing rooms which need to replace testing wire cables.

The invention discloses an electronic device, which comprises a device main body (100) and a sound emitting device (200), wherein: the device main body (100) is provided with a first sound outlet hole (110) and at least two second sound outlet holes (120). ), the installation cavity (130) and the first sound guide channel (140), the first sound outlet hole (110) is located on the first side of the device body (100), and at least two second sound outlet holes (120) are located on the device body The second side of (100); the sounding device (200) is arranged in the installation cavity (130), and the sounding device (200) separates the installation cavity (130) into a first sub-cavity (131) and a second sub-cavity (132) ; The first sound outlet hole (110) communicates with the first sub-cavity (131), at least two second sound outlet holes (120) are arranged at intervals, and are connected to the second sub-cavity (132) through the first sound guide channel (140) ) connected. The above-mentioned solution can solve the problem that the current electronic equipment cannot take into account the security of the call and the clear call when making a call.

The invention discloses an intelligent head-mounted device. The smart head-mounted device includes a lens and a leg connected to the lens, and a sounding unit is arranged on the same leg, and the sounding unit includes a first sounding device and a second sounding device, and the first The sound generating device and the second sound generating device radiate sound waves outward through their respective sound outlet holes. During operation, the phases of the first sound generating device and the second sound generating device are opposite, and the first sound generating device and the second sound generating device Different distances to the same ear hole of the wearer.

In one embodiment, earphones with bimodally fitting earbuds enable accurate reproduction of music while exposing a wearer to environmental noises on one side of the wearer. More specifically, an open earbud is designed to create a substantially open (i.e., unsealed) sound chamber around one ear while a closed earbud is designed to create a substantially closed sound chamber around the other ear. Because the open earbud is associated with sound leakage that alters both the intended level and the bass content of the music, the earphones include a signal redistribution subsystem that perspicaciously replaces at least a portion of this lost signal energy. Advantageously, such earphones expose the wearer to useful localized sounds, such as noises from an auto lane adjacent to a bike lane, while conveying the intended mix of music more accurately than conventional earphones with two open earbuds.

A bone conduction wave generation device includes a waveform generator which generates a first output wave and a second output wave for bone conduction. The waveform generator generates, on a basis of an input wave, the first output wave outside of an audible range and the second output wave outside of an audible range. The first output wave and the second output wave are to be combined into a composite wave having an audible beat.

There is provided a local sound field forming apparatus including a local sound field forming filter coefficient recording unit that records an audio filter coefficient for forming a sound field by an evanescent wave, a filter unit that convolves the audio filter coefficient and a sound source signal to generate a loudspeaker drive signal, and a loudspeaker array that includes a plurality of loudspeakers including a directional loudspeaker, and that reproduces a sound on the basis of the loudspeaker drive signal. The present technology can be applied to a local sound field forming apparatus.

The invention discloses an electronic device, which comprises a device main body (100) and a sound emitting device (200), wherein: the device main body (100) is provided with a first sound outlet hole (110) and at least two second sound outlet holes (120). ), an installation cavity (130) and at least two first sound guide channels (140), the first sound outlet hole (110) is located on the first side of the device main body (100), and at least two second sound outlet holes (120) Located on the second side of the device main body (100); the sound-generating device (200) is arranged in the installation cavity (130), and the sound-generating device (200) separates the installation cavity (130) into a first sub-cavity (131) and a second sub-cavity (132); the first sound outlet hole (110) communicates with the first subcavity (131), and the at least two second sound outlet holes (120) communicate with the at least two first sound guide channels (140) The second subcavity (132) communicates. The above-mentioned solution can solve the problem that the current electronic equipment cannot take into account the security of the call and the clear call when making a call.

The invention relates to a 100kW low-noise emergency diesel-oil electric generator wagon and an implementation method, aiming to solve the problem that a traditional emergency diesel-oil electric generator wagon has no sound insulation and noise reduction measures, and even if a noise reduction is provided, the noise reduction effect is not obvious, which causes the environmental pollution. The 100kW low-noise emergency diesel-oil electric generator wagon comprises an automobile chassis (1) for carrying cargos with a 100kW diesel generator set and an electrical control device, wherein a soundinsulation box body (2) is arranged on the automobile chassis (1) for carrying cargos, and the sound insulation box body (2) is internally and sequentially provided with a wind inlet cabin (3), a main cabin (4), a vent cabin (5), a roller cabin (6) and a control cabin (7); and the automobile chassis (1) for carrying cargos is connected with a headstock (8). The invention is used for the 100kW low-noise emergency diesel-oil electric generator wagons.