1467 results about "Sound production" patented technology

The utility model discloses a sound production device and a sound production module, the sound production device comprises a shell, a magnetic circuit system and a vibration system, and the shell is provided with a first sound outlet hole; the vibration system comprises a first vibrating diaphragm, a second vibrating diaphragm, a middle diaphragm and a voice coil, the first vibrating diaphragm is arranged on one side, far away from the magnetic circuit system, of the shell, the second vibrating diaphragm is arranged on one side, facing the magnetic circuit system, of the first vibrating diaphragm, and the middle diaphragm is arranged between the first vibrating diaphragm and the second vibrating diaphragm; the voice coil is at least partially arranged in the magnetic gap of the magnetic circuit system, and the middle diaphragm and the second diaphragm are located outside the voice coil; the outer edges of the second vibrating diaphragm and the middle diaphragm are connected with the shell, and the inner edges of the second vibrating diaphragm and the middle diaphragm are connected with the first vibrating plate of the first vibrating diaphragm; a second sound production cavity communicated with the first sound production hole is formed between the second vibrating diaphragm and the middle diaphragm; a first rear cavity is defined by the first vibrating diaphragm and the middle diaphragm, and a second rear cavity communicated with the first rear cavity is defined by the first vibrating diaphragm, the second vibrating diaphragm and the shell.

The utility model discloses a sound production device, a sound production module and electronic equipment, the sound production device comprises a shell, a magnetic circuit system and a vibration system, the shell is provided with an accommodating space, and the shell is provided with a first sound outlet hole; the magnetic circuit system is arranged in the accommodating space and is provided with a magnetic gap; the vibration system comprises a first vibrating diaphragm, a second vibrating diaphragm, a middle diaphragm and a voice coil, the first vibrating diaphragm is arranged on one side, far away from the magnetic circuit system, of the shell, the second vibrating diaphragm is arranged on one side, facing the magnetic circuit system, of the first vibrating diaphragm, and the middle diaphragm is arranged between the first vibrating diaphragm and the second vibrating diaphragm; the voice coil is at least partially arranged in the magnetic gap, the voice coil is connected with the first diaphragm, and the second diaphragm and the middle diaphragm are located on the outer side of the voice coil; the outer edges of the second vibrating diaphragm and the middle diaphragm are connected with the shell, and the inner edges of the second vibrating diaphragm and the middle diaphragm are connected with the first vibrating diaphragm; and a closed second sound production cavity is formed between the second vibrating diaphragm and the middle diaphragm and is communicated with the first sound outlet hole.

The utility model discloses a sound production device and a sound production module, the sound production device comprises a shell, a magnetic circuit system and a vibration system, the shell is provided with a first sound outlet hole, and the shell comprises a first shell and a second shell; the magnetic circuit system is fixed on the second shell and is provided with a magnetic gap; the vibration system comprises a first vibrating diaphragm, a second vibrating diaphragm, a middle diaphragm and a voice coil, the first vibrating diaphragm is arranged on one side, far away from the magnetic circuit system, of the shell, and the outer edge of the first vibrating diaphragm is fixed on the first shell; the second vibrating diaphragm is arranged on one side, facing the magnetic circuit system, of the first vibrating diaphragm, and the outer edge of the second vibrating diaphragm is clamped between the first shell and the second shell; the middle diaphragm is arranged between the first vibrating diaphragm and the second vibrating diaphragm, and the outer edge of the middle diaphragm is connected with the first shell; the voice coil is at least partially arranged in the magnetic gap; the inner edges of the second vibrating diaphragm and the middle diaphragm are connected with the first vibrating diaphragm; and a closed second sound production cavity is formed between the second vibrating diaphragm and the middle diaphragm and is communicated with the first sound outlet hole.

The invention discloses a sound production device, a sound production module and electronic equipment, and relates to the technical field of electroacoustic transduction, a vibration plate of a vibration system of the sound production device comprises a first plate part and a second plate part which are located on different horizontal planes, the top of a voice coil is connected with the first plate part, and the second plate part is located on the inner side of the voice coil; a central magnetic part of the magnetic circuit system comprises a first central magnet and a second central magnet which are located on the two opposite sides of the second plate part, the first central magnet and the second central magnet are magnetized in the first direction, and the magnetizing directions of the first central magnet and the second central magnet are opposite. The side, opposite to the vibrating diaphragm assembly, of the first center magnet is connected with the first magnet yoke, the side, opposite to the vibrating diaphragm assembly, of the second center magnet and the edge magnetic part are connected with the second magnet yoke, and the peripheral edges of the first magnet yoke and the second magnet yoke are connected in a welded mode. According to the sound production device, the thinning design can be realized, the BL value is effectively improved, the magnetic lines are distributed more uniformly, the BLx curve is flatter, and thus the distortion is reduced.

The present invention relates to the technical field of sound energy conversion, and disclosed are a sound production apparatus and an electronic device. The sound production apparatus comprises a magnetic circuit system, a first vibration system, a second vibration system, and a housing; the magnetic circuit system is used for forming a first magnetic gap and a second magnetic gap; the first vibration system comprises a first annular diaphragm and a first voice coil, wherein the first voice coil is arranged corresponding to the first magnetic gap; the second vibration system comprises a second diaphragm and a second voice coil; the housing and the first vibration system define a first sound cavity; a side sound outlet hole communicated with the first sound cavity is formed in a side wall of the housing; the housing and the second vibration system define a second sound cavity; and a front sound outlet hole communicated with the second sound cavity is formed in the housing, such that the sound production apparatus can be adapted to a use scenario in which a front sound outlet tube and a side sound outlet tube are provided. Because both the first vibration system and the second vibration system can produce sound, the total radiation area of the sound production apparatus is increased, and the performance of the sound production apparatus is improved.

The invention discloses a sound production device, a sound production module and electronic equipment, and relates to the technical field of electroacoustic transduction, and the sound production device comprises a first sound production monomer and a second sound production monomer which are arranged side by side along a first direction, the vibrating plates of the first sound production monomer and the second sound production monomer comprise first plate parts and second plate parts which are located on different horizontal planes in the second direction, the first plate parts are connected with the top of the voice coil and the vibrating diaphragm respectively, and the outer peripheries of the second plate parts abut against the inner peripheral wall of the voice coil; the central magnetic part of each of the first sound production single body and the second sound production single body comprises a first central magnet and a second central magnet which are positioned on two opposite sides of the second plate part; each first central magnet and each second central magnet are magnetized along a second direction and are opposite in magnetizing direction; and the magnetic energy product of the first central magnet of at least one central magnetic part is greater than that of the second central magnet. According to the sound production device, the BL value is improved, and distortion is reduced.

The embodiment of the invention discloses an ear clip type earphone stable to wear and an earphone device, and the earphone comprises a first housing which is provided with an audio cavity; the sound production assembly is arranged in the audio cavity; the second shell and the first shell are arranged at an interval; the connecting piece comprises a first end, a second end and a matching part; the first end and the second end are oppositely arranged; the matching part is positioned between the first shell and the second shell; the first end of the connecting piece is connected with the first shell; the second end of the connecting piece is connected with the second shell; the curvature of a first connecting section, located between the first end and the matching part, of the connecting piece is smaller than that of a second connecting section, located between the second end and the matching part, of the connecting piece.

The invention discloses a vibration sound production device and electronic equipment, and relates to the technical field of electroacoustic transduction, a sound production unit of the vibration sound production device comprises a first vibration system and a first magnetic circuit system, and the vibration unit comprises a vibrator assembly suspended on the periphery of the sound production unit and stator assemblies located on the two opposite sides of the sound production unit. Two driving coils of the stator assembly are located on the two sides of the sound production unit in the second direction, the stator assembly drives the vibrator assembly to vibrate in the second direction, and the projections of the first magnetic circuit system and the vibration unit in the first direction are both located in the projection range of the vibrating diaphragm assembly in the first direction; the side part of the shell is provided with a limiting part extending towards the accommodating space, and the limiting part is located on the side, facing the vibrating diaphragm assembly, of the vibrator assembly. According to the vibration sound production device, the sound production unit and the vibration unit are integrated, stacking arrangement is not needed, the functions are mutually independent and do not interfere with each other, and the thickness of a product is reduced while the performance requirements of the sound production unit and the vibration unit are met.

The utility model discloses a sounding device, a sounding module and an electronic device, and relates to the technical field of electroacoustic transduction, a central magnetic part of a magnetic circuit system of the sounding device comprises a first central magnet, a central magnetic conductive plate and a second central magnet which are stacked, and the inner side of an inner folding ring of a first diaphragm assembly of a vibration system is connected with the central magnetic part. The outer periphery of the outer folding ring is connected with the shell, the diaphragm and the second diaphragm assembly are sequentially arranged on the side, facing the magnetic conductive yoke, of the first diaphragm assembly, the outer edges of the diaphragm and the second diaphragm assembly are both connected with the shell, and the inner edge of the diaphragm is connected with the inner edge of the second diaphragm assembly. And the rigid connecting piece is connected with the second vibrating diaphragm assembly, and the other end of the rigid connecting piece is connected with the voice coil, so that the voice coil drives the second vibrating diaphragm assembly to vibrate through the rigid connecting piece. According to the sounding device, the effective vibration area of a vibration system is increased, and the acoustic performance is improved.

An embodiment of the present specification provides an ear clip type earphone, comprising: a sounding part configured to be located in a conchae of a wearer and to be in contact with an inner wall of the conchae, the sounding part comprising: a housing forming an accommodating cavity; the sound production assembly is accommodated in the accommodating cavity; the sound outlet hole is formed in the shell, and the sound outlet hole is configured to lead out the sound generated by the sound production assembly; the abutting part is configured to abut against the back of the ear of the wearer; the ear hook is configured to bypass the antihelix and the helix of the wearer and connect the sound production part and the abutting part, and the ear hook is provided with a first symmetric surface; the shell is provided with a feature point which is in contact with the abutting part or is closest to the abutting part, the feature point is projected on the first symmetric plane to form a first projection point, and the ear clip type earphone further comprises a pressure relief hole; the arc length between the projection point of the center of the pressure relief hole on the first symmetry plane and the first projection point is within the range of 7.5 mm-9.5 mm.

An earphone, including: a housing, a first speaker unit, a second speaker unit. The housing has a sound output hole. The first speaker unit and the second speaker unit are separately independently fastened in the housing. The first speaker unit produces a sound toward the sound output hole. The second speaker unit is located on a side that is of the first speaker unit and that is away from the sound output hole and is spaced apart from the first speaker unit. A sound production frequency of the second speaker unit is smaller than a sound production frequency of the first speaker unit. A cavity is enclosed by the first speaker unit, the second speaker unit, and an inner wall of the housing, the cavity serves as a front cavity of the second speaker unit, and the front cavity communicates with the sound output hole through a sound output channel.

The utility model discloses a double-sided sound production loudspeaker, which comprises a shell, a magnetic circuit system and a vibration unit, the magnetic circuit system comprises a magnetic conductive seat connected with the shell, the magnetic conductive seat comprises a main magnetic plate and side magnetic plates, the side magnetic plates are respectively arranged on two sides of the main magnetic plate along a first direction at intervals, the main magnetic plate is provided with a main magnetic unit, and the main magnetic unit is provided with a plurality of vibration units. An edge magnetic unit is arranged on the edge magnetic plate; the vibrating unit comprises vibrating diaphragms and voice coils, the two vibrating diaphragms are arranged on the shell in a spaced mode in the second direction, the voice coils are arranged on the two vibrating diaphragms, and the voice coils are located between the main magnetic unit and the side magnetic units. According to the double-sided sounding loudspeaker, the two sides of the magnetic circuit system are respectively provided with one vibration unit, so that the two voice coils can form two independent magnetic fields through the main magnetic unit and the side magnetic units respectively, double-sided sounding is realized, the two magnetic fields share one magnetic conductive seat, the space occupied by the magnetic circuit system along the first direction is reduced, and the space occupied by the magnetic circuit system along the second direction is reduced. And the miniaturization and thinning development of the double-sided sounding loudspeaker is facilitated.

The invention provides electronic equipment. The electronic equipment comprises a first display screen, a first sound production area, a second sound production area and a second display screen, the first display screen comprises a first display area and a second display area, and when the electronic equipment is in a folded state, the first display area of the first display screen is opposite to the second display area of the first display screen; the first display area of the first display screen and the second display screen are stacked; wherein the first display screen is arranged on a first surface of the electronic equipment, the second display screen is arranged on a second surface of the electronic equipment, the first surface is connected with the second surface through a frame, the first sound production area is arranged on the first surface and / or the frame, and the second sound production area is arranged on the second surface and / or the frame; the first sound production area is used for producing sound when the electronic equipment is in an unfolded state, and the second sound production area is used for producing sound when the electronic equipment is in a folded state.

The present application provides a sound production apparatus and an electronic device. The sound production apparatus comprises a housing, a magnetic circuit assembly, a vibration assembly, and a spider. The magnetic circuit assembly has a first magnetic gap and a second magnetic gap. The vibration assembly comprises a diaphragm component and a voice coil component. The voice coil component comprises a first voice coil disposed corresponding to the first magnetic gap and a second voice coil disposed corresponding to the second magnetic gap. The spider is electrically connected to the voice coil component and an external circuit. The spider comprises a connection arm, a bent arm, and a vibration arm connected in sequence. The connection arm is disposed on the diaphragm component and is electrically connected to the first voice coil and the second voice coil. The vibration arm extends in a bent shape. The bent arm is connected between the connection arm and the vibration arm, and the bent arm extends from an inner end of the vibration arm along a vibration direction of the vibration assembly and is connected to the connection arm. This configuration improves the magnetic field strength of the magnetic circuit assembly, thereby increasing the BL value of the sound production apparatus and ensuring the acoustic performance of the sound production apparatus.

Disclosed in the present invention are a sound production module and an electronic device. The sound production module comprises a module housing and a sound production unit, a vibration plate of a diaphragm assembly of the sound production unit is provided with a magnetic conduction part, an upper shell of the module housing is located on the side of the diaphragm assembly facing away from a magnetic circuit system, an auxiliary magnet is arranged on the upper shell, the magnetization direction of the auxiliary magnet is opposite to that of a central magnetic part, wherein there is a first magnetic attraction between the magnetic conduction part and the auxiliary magnet, and there is a second magnetic attraction between the magnetic conduction part and the magnetic circuit system, and in a non-working state, a vibration system is located at a balance position between the auxiliary magnet and the magnetic circuit system under the combined effect of the first magnetic attraction and the second magnetic attraction. According to the present invention, the magnetic conduction part and the auxiliary magnet are provided to introduce a static magnetic force into the vibration system, so as to reduce the stiffness of the vibration system, thereby greatly improving the low-frequency effect of the sound production module.

The invention provides a sound production device and electronic equipment. The sound production device comprises a first transducer and a second transducer, the first transducer comprises a first base and a first vibration assembly, the outer periphery of the first vibration assembly is fixed to the first base, the second transducer comprises a second base and a second vibration assembly, and the second vibration assembly is fixed to the second base. The second vibration assembly and the first vibration assembly are oppositely arranged at an interval. A vibration space is defined by the middle of the first vibration assembly and the second transducer, an acoustic channel is defined by the second vibration assembly and the outer periphery of the first vibration assembly, and the vibration space is communicated with an external space through the acoustic channel. The sounding device is simple in structure and small in size.

The invention provides a multifunctional sound production device. The multifunctional sound production device comprises a shell with an accommodating space, a vibration unit accommodated in the shell, a driving coil for driving the vibration unit to vibrate, and an elastic sheet fixed on the vibration unit and the shell, the vibration unit comprises a lower clamping plate connected with the elastic sheet and a sound production single body fixed in the lower clamping plate, and a vibration system of the sound production single body comprises a vibrating diaphragm fixed to the basin frame and a voice coil driving the vibrating diaphragm to vibrate and produce sound in the first direction. The magnetic circuit system of the sound production single body comprises main magnetic steel fixed on the lower clamping plate, and the driving coil and the main magnetic steel are oppositely arranged in a spaced mode in the first direction so as to drive the vibration unit to vibrate in the second direction perpendicular to the first direction. The loudspeaker assembly and the motor assembly share one magnetic circuit system, so that the cost is effectively reduced, the vibration sense of the vibration unit is increased, and the performance of the multifunctional sound production device is improved.

The invention discloses a prediction method and device for tread pattern noise and a nonvolatile storage medium. The method comprises the steps that a target tread pattern is obtained, a first contour line and a second contour line of the target tread pattern are obtained, the first contour line is used for indicating the front edge shape of the target tread pattern when the target tread pattern makes contact with the ground, and the second contour line is used for indicating the rear edge shape of the target tread pattern when the target tread pattern leaves the ground; determining a first matrix based on the first contour line, the second contour line and the target tread pattern; elements in the first matrix are converted into attenuation sinusoidal signals, a second matrix is obtained, and the attenuation sinusoidal signals are used for simulating sound pressure change information of noise generated when the pattern blocks impact the ground; and determining a first noise of the target tread pattern based on the second matrix. According to the method and the device, the technical problem of inaccurate precision caused by no consideration of a sound wave model of pattern block or pattern groove sound production during prediction of the tread pattern noise and a mark shape generated when the tire is grounded in the prior art is solved.

The embodiment of the invention provides a display module and electronic equipment, relates to the technical field of intelligent wearing, and is used for solving the problem that the size of the electronic equipment is relatively large. In the display module, a supporting sheet is arranged on the back surface of a display screen, and the supporting sheet is connected with the display screen. The piezoelectric vibration piece is connected with the surface, away from the display screen, of the supporting piece. The vertical projection of the piezoelectric vibration piece on the back face of the display screen is located in the vertical projection range of the supporting piece on the back face of the display screen. And the piezoelectric vibrating reed drives the display screen to vibrate to realize screen sounding, so that the functions of sounding devices such as a loudspeaker, a buzzer and a sonar module can be realized. Sound production devices such as a loudspeaker, a buzzer and a sonar module do not need to be arranged in the electronic equipment, and the internal space of the electronic equipment can be saved.

The invention discloses a sound production device, a sound production module and electronic equipment, and relates to the technical field of electroacoustic transduction. A vibration plate of a vibration system of the sound production device comprises a first plate part and a second plate part which are arranged in a split mode and located on different horizontal planes; the waterproof film comprises a first connecting part located at the top of the voice coil, a second connecting part in attached connection with the inner circumferential wall of the voice coil and a third connecting part located in the voice coil, the first plate part is connected with the first connecting part, and the second plate part is connected with the third connecting part; a center magnetic part of the magnetic circuit system comprises a first center magnet and a second center magnet which are located on the two opposite sides of a second plate part, the first center magnet and the second center magnet are magnetized in the first direction, and the magnetizing directions are opposite. According to the sound production device, the thinning design can be realized, the BL value is effectively improved, the magnetic lines are distributed more uniformly, the BLx curve is flatter, and thus the distortion is reduced.

The invention discloses a dose adjustment forward and reverse rotation structure of a medicine delivery device, and belongs to the technical field of medical instruments, the dose adjustment forward and reverse rotation structure comprises a knob, a ratchet seat, ratchet teeth, jumping teeth and an injection spring, the ratchet seat is connected with the ratchet teeth through a forward sound generating part, and the ratchet teeth and the jumping teeth are connected through a reverse sound generating part in a clutch mode; a first forward rotation cooperation part and a first reverse rotation cooperation part are arranged on the rotary knob, a second forward rotation cooperation part and a second reverse rotation cooperation part are arranged on the jumping teeth, and the injection spring is used for enabling the ratchet wheel teeth to be connected with the jumping teeth. The device is simple in structure, convenient to install and good in stability, the preset dosage can be adjusted through clockwise rotation, the force stored by the torsion spring can be clamped, the preset dosage can be reduced through anticlockwise rotation until the preset dosage returns to the zero position, forward rotation is converted into radial elastic tooth jumping meshing sound production, and reverse rotation is converted into axial tooth jumping meshing sound production.

The invention provides a conference environment intelligent sound field control system. A main sound source module, a plurality of sound field node intensity adjusting modules, a human body recognition positioning module and a processing control module work cooperatively. The main sound source module integrates the functions of main sound production, direction adjustment, sound source reception and direction detection, and can automatically track the position of a speaker and adjust the direction of a sound source. And the sound field node intensity adjustment module optimizes the sound field effect at each part of the conference space through node sound reception, compensation sound production, intensity adjustment and node processing. The human body recognition positioning module tracks the positions of participants in real time and provides the positions to the processing control module for intelligent decision making. The system can automatically adjust the direction and intensity of the sound field according to the distribution of participants, guarantees the precise transmission of sound, and reduces the interference of environmental noise. According to the intelligent sound field control scheme, conference voice definition and communication efficiency are remarkably improved, conference scene requirements of various scales and layouts are met, and an intelligent and efficient acoustic solution is provided for a conference environment.

The embodiment of the invention provides an earphone, and relates to the technical field of sound production instruments. The earphone comprises a main body part extending part and a sound production part, the main body part comprises a connecting end and a free end, and in a wearing state, the free end of the main body part extends downwards along the rear side of an ear part; the extension part is connected with the connecting end of the main body part, and the end part, deviating from the main body part, of the extension part bypasses the top of the helix of the ear part and extends towards the auricular conchae of the ear part; a battery of the earphone is arranged on the main body part or the extension part; the sounding part is convexly arranged on one side, facing the auricular conchae cavity, of the extension part, and the sounding part and the extension part are laminated in the coronal axis direction of the human body. According to the earphone provided by the embodiment of the invention, the wearing comfort of the earphone can be improved.

The utility model discloses a sounding device and a sounding module, and relates to the technical field of electroacoustic transduction, the inner side of an inner folding ring of a first vibrating diaphragm assembly of the sounding device is connected with a central magnetic part, and a diaphragm and a second vibrating diaphragm assembly are sequentially arranged on one side, facing a magnetic conductive yoke, of the first vibrating diaphragm assembly; the diaphragm is arranged in the shell, a sound production cavity communicated with a sound production hole of the shell is formed between the diaphragm and the second diaphragm assembly, the diaphragm is a flexible piece, and the two ends of the rigid connecting piece are connected with the second diaphragm assembly and the voice coil respectively, so that the voice coil drives the second diaphragm assembly to vibrate through the rigid connecting piece; the outer periphery of the outer folding ring and the outer periphery of the diaphragm are both connected with the first shell, the magnetic conductive yoke is connected with the second shell, and the outer periphery of the second diaphragm assembly is clamped between the first shell and the second shell. According to the sounding device, the effective vibration area of a vibration system is increased, and the acoustic performance is improved.

Disclosed in the present invention are a sound production apparatus, a sound production module and an electronic device. The sound production apparatus comprises a magnetic circuit system, an electrically conductive bracket and a vibration system, wherein the magnetic circuit system is provided with a mounting hole running through a magnetically conductive yoke and a central magnetic portion, and the electrically conductive bracket is arranged in the mounting hole; one end of a voice coil of the vibration system is connected to a diaphragm assembly, and the other end of the voice coil is arranged corresponding to a magnetic gap; one end of a spider is electrically connected to the electrically conductive bracket, and the other end of the spider is connected to the diaphragm assembly and is electrically connected to a lead wire of the voice coil; and the central magnetic portion comprises a central magnet and a central magnetically conductive plate arranged on a side of the central magnet opposite to the diaphragm assembly, the mounting hole runs through the central magnet and the central magnetically conductive plate, and the electrically conductive bracket is formed as an integral injection-molded structure with the central magnetically conductive plate or the magnetically conductive yoke. The present invention provides a sound production apparatus having an effectively increased magnetic circuit, and the sound production apparatus has a simple and compact structure, is easy to assemble, and has a low magnetic flux leakage to meet the use requirements. In addition, the product has a large BL value, thereby improving the acoustic performance.

An embodiment of the present specification provides an ear clip type earphone, comprising: a sounding part configured to be located in a conchae of a wearer and to be in contact with an inner wall of the conchae, the sounding part comprising: a housing forming an accommodating cavity; the sound production assembly is accommodated in the accommodating cavity; the sound outlet hole is formed in the shell, the sound outlet hole is configured to lead out sound generated by the sound production assembly, and a partial area of the sound outlet hole is shielded by the auricular conchae wall; the abutting part is configured to abut against the back of the ear of the wearer; and the ear hook is configured to bypass the antihelix and the helix of the wearer and connect the sound production part and the abutting part.

The invention relates to the technical field of drainage pipeline detection, and discloses a drainage pipeline structural defect detection system and method, a medium and a product, a controller actively constructs and generates a coded infrasonic wave signal, and it is ensured that the signal has stable frequency and amplitude characteristics; the infrasonic sound production module performs infrasonic wave emission and processing by using a coded infrasonic wave signal, and enables a low-frequency mechanical vibration signal to be stably propagated along a pipe wall, so that energy attenuation is reduced, and a long-distance pipe section which is difficult to touch in traditional passive detection is covered; the infrasound signal receiving module is used for detecting low-frequency mechanical vibration signals and converting analog signals into initial digital signals, and interference and distortion in the transmission process are reduced. Furthermore, by combining a Fourier transform method and a correlation coefficient analysis method, the problem of high misjudgment rate of a traditional single algorithm is avoided, accurate recognition of the structural defects of the pipeline is ensured, and the requirement for accuracy of structural defect detection of the drainage pipeline under complex working conditions is met.

The utility model discloses a sound production device and electronic equipment. The sound production device comprises a shell, a magnetic circuit system, a vibration system and a conductive piece, the magnetic circuit system is connected to the inner side of the shell; the vibration system comprises a first vibrating diaphragm and a second vibrating diaphragm which are respectively positioned on two opposite sides of the magnetic circuit system, and a first voice coil and a second voice coil which are respectively connected with the first vibrating diaphragm and the second vibrating diaphragm; the conductive part is arranged on the shell and provided with a first bonding pad, a second bonding pad and an outer conductive part, the first bonding pad and the second bonding pad are arranged in the first direction and are close to the first vibrating diaphragm and the second vibrating diaphragm respectively, the first direction is the vibration direction of the vibration system, and the second direction is the vibration direction of the vibration system; the first voice coil and the second voice coil are electrically connected with the first bonding pad and the second bonding pad respectively, and the outer conductive part is exposed out of the side surface of the shell and electrically connected with an external circuit. According to the sound production device provided by the invention, the number of the outer conductive parts outside the shell is reduced, the assembly space of the whole machine is saved, and the miniaturization design of a product is facilitated.

The utility model discloses a sound production unit and a head-mounted sound production device, the sound production unit comprises a housing assembly, and a bone conduction sound production device and an air conduction sound production device which are arranged in the housing assembly, the housing assembly comprises a contact surface which is used for contacting with human skin and a sound outlet hole through which sound of the air conduction sound production device is sent out; the sounding unit is provided with a middle surface perpendicular to the width direction of the sounding unit, and the gravity center of the bone conduction sounding device and the gravity center of the air conduction sounding device are located on the two sides of the middle surface respectively; the distance D16 between the gravity center of the bone conduction sound production device and the middle surface is smaller than the distance D17 between the gravity center of the air conduction sound production device and the middle surface, so that the vibration sense generated when the bone conduction sound production device works is closer to the middle area of the surface cover, and the use comfort is better.

Provided in the present application are a vehicle noise cancellation method, apparatus and system, and a device, a medium and a vehicle. The method comprises: on the basis of a travelling speed of a vehicle, determining a target vibration signal corresponding to the travelling speed, wherein the target vibration signal is suitable for implementing sound production of a loudspeaker, so as to perform noise cancellation. In the present application, on the basis of the current travelling speed of a vehicle, a target vibration signal corresponding to the travelling speed can be determined, such that at different travelling speeds of the vehicle, a vehicle noise cancellation control system can perform noise cancellation on the basis of corresponding target vibration signals, thereby improving the accuracy of vehicle noise cancellation.