31results about How to "Boost low frequency sound" patented technology

An audio driver comprising a diaphragm (101, 103) with a first side and a second side. The diaphragm (101, 103) is coupled to a transducer element (109, 111) on the second side and is arranged to radiate sound. The transducer element (109, 111) converts an electrical input signal into movement of the diaphragm (101, 103). The diaphragm (101, 103) is arranged such that a part of the diaphragm (103) at least partly forms a cavity (113) at the second side and an air conduit (115) is coupled to the cavity (113). The air conduit (115) has a first opening (117) into the cavity and a second opening (119) outside the cavity (113). The air conduit (115) and cavity (113) form a resonator which has a resonance frequency that is less than half a free air acoustic resonance frequency of the audio driver. The invention may allow simultaneous sound production and an acoustic air flow generation while maintaining an efficient decoupling between the two functionalities.

An audio signal processing method comprises the steps of emitting a sound at a virtual sound image location in space on the outer side of a closed surface, generating measurement-based directional transfer functions corresponding to a plurality of positions on the closed surface based on a result of measuring the sound at the plurality of respective positions on the closed surface by using a directional microphone, generating composite transfer functions corresponding to the plurality of respective positions on the closed surface by respectively adding, at a specified ratio, the measurement-based directional transfer functions and auxiliary transfer functions and generating reproduction audio signals corresponding to the plurality of respective positions on the closed surface by performing a calculation process on an input audio signal in accordance with the set of composite functions.

Disclosed is an earphone comprising a loudspeaker unit, an audio signal wire electrically connected to the loudspeaker unit, and an auxiliary structure; the auxiliary structure comprises a front cover and a housing; a front acoustic cavity is defined as a space between the front cover and the loudspeaker unit, and a rear acoustic cavity is defined as a space between the housing and the loudspeaker unit; a acoustic guide channel capable of enhancing low-frequency performance of the earphone is disposed on one side of inner sidewall of the housing closer to the loudspeaker unit; the acoustic guide channel comprises an open end and a closed end, and bottom wall of the acoustic guide channel is provided with a plurality of through holes at a position closer to the closed end. Earphone with this structure improves low-frequency and middle-frequency sound effects of products, and makes the earphone has a good appearance.

This invention is to provide a sound reproduction device including a tube, a loudspeaker and a resonance unit, wherein the loudspeaker includes a frame body having a side adjacent to a first diaphragm thereof peripherally fixed to a first opening of the tube, and the resonance unit includes a second diaphragm peripherally fixed to a second opening of the tube and a weighting element fixed at a central position of the second diaphragm. Thus, a closed resonance chamber is defined within the tube between the loudspeaker and resonance unit. When the loudspeaker is driven, the first diaphragm is vibrated and in turn vibrates air in front of the sound reproduction device to make sound and drives the second diaphragm to vibrate air behind the sound reproduction device synchronously in the same direction, thereby producing twice as strong low-frequency sound effect as a traditional sound reproduction device without a resonance unit.

An audio driver including a diaphragm with a first side and a second side. The diaphragm is coupled to a transducer element on the second side and is arranged to radiate sound. The transducer element converts an electrical input signal into movement of the diaphragm. The diaphragm is arranged such that a part of the diaphragm at least partly forms a cavity at the second side of an air conduit is coupled to the cavity. The air conduit has a first opening into the cavity and a second opening outside of the cavity. The air conduit and cavity form a resonator which has a resonance frequency that is less than half a free air acoustic resonance frequency of the audio driver.

A stereo speaker system including: a speaker unit having a plurality of speakers which output audio; and a filter unit selectively receiving low frequency components of the outputted audio. The filter unit eliminates the received low frequency components to decrease back pressure on the speakers. Thus, the phenomenon of air-loading caused by back-pressure is removed and the low frequency characteristic of stereo speakers is improved by activating the vibration of a vibrating plate.

Disclosed is an earphone comprising a loudspeaker unit, an audio signal wire electrically connected to the loudspeaker unit, and an auxiliary structure; the auxiliary structure comprises a front cover and a housing; a front acoustic cavity is defined as a space between the front cover and the loudspeaker unit, and a rear acoustic cavity is defined as a space between the housing and the loudspeaker unit; an acoustic guide channel capable of enhancing low-frequency performance of the earphone is disposed on one side of an inner sidewall of the housing closer to the loudspeaker unit; the acoustic guide channel comprises an open end and a closed end, and a bottom wall of the acoustic guide channel is provided with a plurality of through holes at a position closer to the closed end. An earphone with this structure improves low-frequency and middle-frequency sound effects of products, and makes the earphone have a good appearance.

A superdirectional acoustic system for reproducing a sound signal supplied from a real sound source by using a superdirectional speaker and producing a virtual sound source in a vicinity of a sound wave reflection surface. The system includes an ultrasonic speaker, which includes an ultrasonic transducer for oscillating a sound wave in an ultrasonic frequency band, for reproducing an audio signal in a relatively medium to high frequency sound range, which is included in the sound signal supplied from the real sound source; and a low frequency sound reproducing speaker for reproducing an audio signal in a relatively low frequency sound range, which is included in the sound signal supplied from the real sound source. Sound in the medium-high frequency range is reproduced in a manner such that the sound is produced from a virtual sound source which is formed in the vicinity of the sound signal reflection surface such as a screen.

The present invention is applied to the loudspeaker technology field, and provides a planar diaphragm loudspeaker the planar diaphragm loudspeaker comprises a vibration system and a magnetic field system. The vibration system includes a diaphragm conductor assembly, an upper gasket and a lower gasket, and the upper gasket is provided with two via holes; and the diaphragm conductor assembly includes a diaphragm body, a coating layer and a conduction structure which is formed by winding of wires in the double helix mode and has two free ends respectively corresponding to the two via holes of the upper gasket. The planar diaphragm loudspeaker coats a coating layer at the surface of the diaphragm body to enhance the weight of the central area of the diaphragm body and improve the low-frequency sound effect; and wires are wound at the surface of the coating layer in the double helix mode to allow the conductor structure formed through winding to complete cover the coating layer and fill the area of the diaphragm body to allow the diaphragm body to be fully utilized and allow the whole stress driving aiming at the system to obtain the maximum utilization so as to greatly improve the sensitivity of the planar diaphragm loudspeaker.

The present invention provides a double-vibrating-diaphragm loudspeaker module. The double-vibrating-diaphragm loudspeaker module comprises： a peripheral housing providing with a first sound outlet hole and a second sound outlet hole; a supporting structure fixed on an inner wall of the peripheral housing; and a loudspeaker unit comprising a first vibrating diaphragm, a sound coil, a magnetic circuit system and a second vibrating diaphragm. The sound coil and the magnetic circuit system are separately combined with the first vibrating diaphragm and the second vibrating diaphragm. The sound coil is accommodated in a magnetic gap of the magnetic circuit system. Edges of the first vibrating diaphragm and the second vibrating diaphragm are fixed on the supporting structure. The peripheral housing, the supporting structure and the loudspeaker unit form a first front sound cavity, a second front sound cavity, and a rear sound cavity. The first front sound cavity comprises a space between the first vibrating diaphragm and a part closing to the first vibrating diaphragm, of the peripheral housing, and communicates with the external by using the first sound outlet hole. The second front sound cavity comprises a space between the second vibrating diaphragm and a part closing to the second vibrating diaphragm, of the peripheral housing, and communicates with the external by using the second sound outlet hole. The rear sound cavity comprises a space between the first vibrating diaphragm and the second vibrating diaphragm and forms a sealed hollow cavity. The double-vibrating-diaphragm loudspeaker group can improve high and low frequency acoustic features.

The invention belongs to the technical field of automobile parts and particularly relates to a novel vehicle-mounted vibration and radiation headrest surrounding sound system. At least one resonance box capable of making sounds is arranged in a headrest body. The space between the resonance boxes and the headrest body is filled with filler. The resonance boxes are embedded in the headrest body, make sounds independently and have a good low-frequency sound effect.

The invention provides a flat-plate-type woofer speaker which comprises a vibrating diaphragm, at least six driving units which are mutually independent and an outer shell. The vibrating diaphragm is of a rectangular structure and comprises a ball top portion and a folded ring portion. Each driving unit comprises a voice coil unit and a magnetic circuit unit which corresponds to the voice coil unit. Four voice coil units are combined with four angle portions of the ball top portion of the vibrating diaphragm respectively, the other voice coil units are arranged on one set of opposite edges of the ball top portion or two sets of opposite edges of the ball top portion respectively, and the four voice coil units are not in the same line with the two voice coils on the edges. Mounting holes used for containing the driving units and voice-making holes which penetrate through a mounting plane are formed in the outer shell, and the folded ring portion of the vibrating diaphragm is fixedly connected with the peripheral region of the upper lateral face of the outer shell. The flat-plate-type woofer speaker is capable of solving the problems that an existing woofer speaker is heavy in voice coil, magnet performance is surplus and driving force is insufficient.

Disclosed is a loudspeaker module, which comprises a loudspeaker unit and a peripheral frame comprising an upper housing and a lower housing; a front acoustic cavity and a rear acoustic cavity are respectively defined as a space between the loudspeaker unit and the upper housing, and a space between the loudspeaker unit and the lower housing; a sound hole in communication with the front acoustic cavity is provided on peripheral frame, and an inverted tube is provided in peripheral frame. The loudspeaker module of the present invention is provided with inverted tube in communication with rear acoustic cavity, so that low-frequency acoustic effect of products can be enhanced, and heat dissipation of rear acoustic cavity and balance of atmospheric pressures can be achieved; inverted tube and loudspeaker unit share front acoustic cavity and sound hole, which is beneficial to increasing size of loudspeaker unit and improving acoustic performance of products.

The invention relates to the technical field of receivers, in particular to a printed coil, a manufacturing method thereof and an earphone receiver. The manufacturing method of the printed coil comprises the following steps: preparing UV ink; preparing a voice coil base material according to a preset shape; printing the prepared UV ink on the voice coil base material according to a preset line; and irradiating the surface of the printed substrate by using a cold light source curing machine to cure and mold the printed circuit. The invention also requests to protect the printed voice coil manufactured by the method and the earphone receiver with the printed voice coil. The coil is printed on the base material through a low-temperature printing method, so that the influence of temperature onthe material is reduced, and the low-frequency sound effect of the product can be better by using TPU; and the upper loop and the lower loop are conducted through the blind holes, so that the occupied space of the base material is further saved, and the overall height of the receiver is reduced.

The invention relates to a single track bass boost method, a single track bass boost device and a player in the field of acoustic techniques. According to the method, volumes of a left channel digital audio and a right channel digital audio are attenuated by the same first preset amplitude, then the attenuated left cannel digital audio and the right channel digital audio are added, the added left and right channel digital audios are further divided into a high frequency audio path and a low frequency audio path, digital audio parameters of the high frequency audio path and the low frequency audio path are independently controlled, the volumes of the controlled high frequency audio path and the low frequency audio path are attenuated by the same second preset amplitude, and the attenuated high and low frequency audio paths are further added to form a single track digital audio, so that good low frequency sound sensation is provided when in low volume, and the low frequency audio does not crack when in high volume.

The invention discloses an air flow compression loudspeaker box which comprises a loudspeaker box body, wherein two bass horns are symmetrically arranged in the loudspeaker box body. The air flow compression loudspeaker box further comprises a tweeter which is located between the two bass horns and is connected with a horn; the bass horns and the horn of the tweeter correspond to a sound outlet of the loudspeaker box body; the plane where sound holes of the horn are formed is flush with the front side of the loudspeaker box body; the plane where horn openings of the two bass horns are formed and the front side of the loudspeaker box body form included angles; the bass horns slantways face to the sound outlet of the loudspeaker box body and side plates of the loudspeaker box body; air outlets corresponding to the bass horns are formed in two sides of the sound outlet of the loudspeaker box body; the loudspeaker box body is of a bilateral symmetry structure; an upper side plate, a lower side plate and the side plates of the loudspeaker box body surround the bass horns; and an air flow compression cavity is formed at the horn opening of each bass horn. The loudspeaker box is more compact, reasonable and firm in structure and enables air flow to play a compression role in the loudspeaker box, so that the low-frequency sound effect and the impact force are effectively enhanced.