146 results about "Sound transmission class" patented technology

A finite element model of an ear stored on a computer readable medium having logic representing a three-dimensional geometric model of the ear; logic for meshing individual anatomical structures of the ear accounting for whether the anatomical structures include at least one of air, liquid material and solid material; logic for assigning material properties for each anatomical structure based on at least one physical property of each anatomical structure; logic for assigning boundary conditions for some of the anatomical structures indicative of interaction between such anatomical structures; and logic for employing acoustic-structural coupled analysis to the anatomical structures of the ear to generate data indicative of the acoustic effect on mechanical vibration transmission in the ear. Various embodiments of “one-chamber” and “two-chamber” analyses and models are described.

A sound distribution apparatus provides a driver with an audible impression of the operating speed, load and performance of a vehicle engine. The sound distribution apparatus includes an assembly of one or more sound transmission ducts interconnected to conduct or transmit engine sounds from the air intake tract into the passenger compartment and to distribute the sound in a uniform fashion from behind the dashboard at the front to the passenger compartment. The sound distribution duct includes a plurality of sound diffusion apertures arranged on the outer wall, each configured to diffuse a portion of the transmitted sound into the passenger compartment. A sound permeable airflow blockage device seals the sound transmission duct interior in a gas-tight way preventing airflow.

An acoustic system includes: a first customer-side microphone; a first counselor-side microphone; a first sound changing unit; a first loudspeaker; a second customer-side microphone; a second counselor-side microphone; and a second loudspeaker. Between the second loudspeaker and the first customer-side microphone, a first sound transmission path is provided. Also, between the second loudspeaker and the first counselor-side microphone, a second sound transmission path is provided. These sound transmission paths have substantially the same length. The first sound signal generated by the first customer-side microphone is made to have a phase substantially opposite to that of the second sound signal generated by the first counselor-side microphone, and the sound signals are added together.

A prediction method for sound insulation performance of a car front wall is as follows: different thickness of steel plates are installed on sound insulation walls of reverberation chambers and anechoic chambers, and sound transmission loss STL (steel plate) of the different thickness of steel plates is tested; different thickness of different front wall panel materials are attached to the steel plates, and sound transmission loss STL (panel) of the different thickness of different front wall panel materials is tested; and combined sound transmission loss STL (combination) is calculated according to the sound transmission loss STL (steel plate) of the steel plates and the sound transmission loss STL (panel) of the front wall panel materials. Equivalent sound transmission loss of a front wall system is predicted by pre measurement of the sound transmission loss STL (steel plate) of the steel plates and the sound transmission loss STL (panel) of the different thickness of different front wall panel materials, during prediction of sound transmission loss of different front wall systems, the sound transmission loss can be calculated by direct extraction of corresponding pre measured data without cutting of the car front wall, customization of tooling, sealing, and other operation, and the work loading of sound transmission loss testing of the front wall system is greatly reduced.

An exhaust system (1) is provided for an internal combustion engine (4), especially in a motor vehicle, with two separate exhaust gas lines (2, 3) with a first sound transmission feature (7), which couples the two exhaust gas lines (2, 3) with one another, and with a control (9) for activating and deactivating the first sound transmission connection (7) as a function of at least one operating parameter of the internal combustion engine (4). To improve the muffling behavior, a second sound transmission connection (8) is provided, which couples the two exhaust gas lines (2, 3) with one another downstream of the first sound transmission connection (7), and makes possible, depending on the particular operating parameter, three switching states (SZ), namely, a first switching state, in which both sound transmission connections (7, 8) are deactivated, a second switching state, in which only one sound transmission connection (7, 8) is activated, and a third switching state, in which both sound transmission connections (7, 8) are activated.

The invention discloses an earphone interface compatible with a microphone function. The earphone interface comprises an earphone socket (2) and a seal device (3); a microphone (6) is arranged in the seal device (3), and the earphone socket (2) and the seal device (3) are fixedly mounted on a printed circuit board (1) respectively; a sound transmission hole (4) is formed in the earphone socket (2) close to the seal device (3); a sound picking hole (5) matched with the sound transmission hole (4) is formed in the seal device (3) close to the earphone socket (2). According to the invention, the sound transmission hole in the earphone interface is used as the sound picking hole for denoising MIC, so that the double-microphone denoising function is achieved without arranging additional sound picking hole in a cellphone casing, and the machining difficulty of the cellphone casing is reduced; the earphone interface does not affect the functions of the cellphone including anti-dust, anti-static and the like, is easy to implement, and is suitable for various cellphones.

A vehicle flooring system with improved thermal and acoustic properties is provided that does not unreasonably increase the thickness and weight of the flooring system and does not break down due to repeated exposure to high temperatures and wide ranging temperature fluctuations. Various materials and construction methods are combined to provide a system with optimized thermal conductivity, having varied density ratios of materials to meet particular sound transmission loss profiles. These materials include a wide range of foam and other materials.

The invention discloses a test device and method for sound transmission loss of a white vehicle door assembly with multiple metal sheets, and relates to the technical field of automobile component production. The test device comprises a metal sheet installing device, a noise generation and reception component and a data processor; the metal sheet installing device comprises a reverberation chamber(1), a anechoic room (2) and an installation part (4) to be tested; the noise generation and reception component comprises a sounder (3), a sounding microphone and a sound receiving microphone; and the data processor comprises a data collector (14), a data processor (13), a signal generator (12), a filter (11) and a power amplifier (15). The problems that at present the sound transmission loss ofthe whole white vehicle door cannot be tested, calculation via data calculate tends to cause a large error, a test result may be inaccurate, further development of the thin wall plate structure and material of the white vehicle door is influenced, and the satisfied degree of users cannot be improved are solved.

Provided is a glass fiber cotton felt used for sound insulation and heat insulation. The glass fiber cotton felt used for sound insulation and heat insulation is characterized in that the glass fiber cotton felt is made by the following method: fusing glass blocks to clear glass melt through a kiln, through primary drawing and flame injection, obtaining glass wool, through spraying an adhesive, the glass wool bonding to form a felt, and finally curing through a curing oven. Average fiber diameter of the glass fiber cotton felt is 0.5-3.5 [mu]m, volume-weight is 6.5-20.5 kg/m<3>, gum content is 1-25%, 1000 Hz sound transmission loss is 5.2-11.4 dB, heat conductivity coefficient is 0.020-0.045 W/(m.K), and air permeability is 250-715 mm/s. The invention also discloses a manufacturing method for the glass fiber cotton felt used for sound insulation and heat insulation. The method comprises the following steps: (1) feeding in materials; (2) performing primary drawing; (3) performing secondary drawing; (3) collecting cotton and spraying adhesive; (5) curing and drying; (6) trimming and rolling cotton. Beneficial effects of the glass fiber cotton felt are that 1, the sound insulation and heat insulation performance are excellent; 2, quality is stable and cotton felt uniformity is good; 3, the cotton felt is light and high in strength.

The invention provides a middle frame component and an electronic device. The middle frame component comprises a frame body and a conductive sound transmission layer, wherein a through hole structure for sound transmission is formed in the frame body, the frame body is provided with a grounding metal area, and the through hole structure is filled with the conductive sound transmission layer which is electrically connected with the grounding metal area. According to the middle frame component provided by the invention, the conductive sound transmission layer is arranged in a filling groove on the frame body, and the conductive sound transmission layer is electrically connected with the grounding metal area on the middle frame component, so that static electricity generated at the through hole structure near a receiver component is imported into the grounding metal area, and thus the middle frame component has the beneficial effect of improving the resistance to static interference.

Spherical sound source comprising two coaxial loudspeakers and two mid-high frequency compression drivers. Low frequencies are radiated by the two low-frequency sections of the coaxial loudspeakers. Mid-frequencies 500 Hz-2000 Hz are radiated by the two mid-high frequency compression drivers. High-frequencies 2 kHz-10 kHz are radiated in the horizontal plane by the same mid-high frequency arrangement together with two compression drivers of the coaxial loudspeakers in each vertical direction. Identical drivers form three pairs. One driver from each pair is enclosed in one of two symmetrically opposite half-embodiments, spaced at predetermined distance to create a common radially expanding horn for the two mid-high frequency compression drivers. All loudspeakers share the same vertical axis of rotational symmetry. The two half-embodiments might be used as separate standalone spherically radiating sources when installed on hard surface. The invention is appropriate for sine-swept acoustic measurements and sound isolation measurements in high sound transmission class buildings.

The application provides a shell assembly, electronic equipment and a control method thereof. The shell assembly comprises a middle frame, a first ornament and a driving mechanism, wherein the middleframe is provided with a sound transmission channel; the first ornament is movably arranged on a sound outgoing side of the sound transmission channel; the driving mechanism comprises a motor and a screw rod; an output shaft of the motor is connected with the screw rod in order to drive the screw rod to rotate reciprocally; and the screw rod is connected with the first ornament in order to drive the first ornament to open or close the sound transmission channel on the sound outgoing side when the screw rod rotates reciprocally. Through the shell assembly, the sound transmission channel is closed when not in use, and opened only when in use so as to prevent external dust from entering the electronic equipment through the sound transmission channel, thereby improving the sound quality effect.

The invention relates to an integrated sound production and transmission sensor. The sensor is characterized in comprising a hollow shell, a sound production device, a sound transmission device, and a mounting structure through which the sound production device and the sound transmission device are coaxially mounted on the hollow shell, thereby forming an integrated module. The hollow shell is equipped with a sound emission channel matching with the sound emission direction of the sound production device, and a sound emission hole for communicating the sound emission channel to the external. The integrated module is formed by coaxially mounting the sound production device and the sound transmission device on the hollow shell. When an acoustical device is assembled, only the whole integrated module is mounted at the corresponding position of the shell of the acoustical device. The sensor has the advantages of simple and easy mounting and stable finished product performance.

The invention discloses an integrated silicon condenser microphone. The integrated silicon condenser microphone comprises a shell, which is provided with at least one sound inlet hole, a substrate, which is provided with a hole, two or four MEMS (Micro-Elecro-Mechanical System) sensing elements, which are in seamless physical connection, an integrated circuit and sound cavities, wherein the sound cavities are formed by the two or four MEMS sensing elements and the substrate together, specifically, the sound cavities of the two or four MEMS sensing elements are symmetrically communicated through holes in the substrate, and through the symmetrical sound cavities, which are shared and arranged in the shell and are formed by the same sound inlet path relative to the position of each MEMS sensing element, the sound wave is input until a sound transmission path for an electric signal, which is converted by the sound wave through each MEMS sensing element, is fully symmetrical for each MEMS sensing element in the silicon microphone, wherein a sound inlet path is a path formed from the sound inlet hole in the shell to the sound cavities to a vibrating diaphragm of each MEMS sensing element; the integrated circuit is used for buffering/amplifying and outputting the electric signal, which is converted by sending the sound wave to each MEMS sensing element through the sound transmission path.

The invention discloses a rectangular opening sound transmission rate and sound transmission loss computing method. The method comprises, firstly, defining a rectangular-opening coordinate system, and establishing force balance formulas of both cross sections of the opening and the sound transmission matrixes at both ends of the opening; secondly, utilizing the properties of sound radiating impedance of vibration of air layers at both ends of the opening to achieve computation of the sound transmission rate of a rectangular opening single-level mode under the condition of parallel sound wave incidence; thirdly, superpositioning the sound transmission rate of every level of mode to obtain the sound transmission rate of the rectangular opening; fourthly, integrating incident angles to obtain the sound transmission rate of the rectangular opening under the condition of scattered sound field incidence; lastly, calculating the sound transmission losses of the rectangular opening under the condition of the scattered sound field incidence through a relation between sound transmission losses and sound transmission rates. The rectangular opening sound transmission rate and sound transmission loss computing method can be used for computing the sound transmission rates or the sound transmission losses of one or more certain levels as well as computing total sound transmission rates or total sound transmission losses, thereby greatly improving the computing flexibility, and meanwhile, by omitting the influence of the very small sound radiating impedance of both a part of real parts and a part of imaginary parts, greatly improves the calculating speed.

The invention relates to electronic equipment and a microphone waterproof structure. The microphone waterproof structure comprises a housing and a microphone. The microphone and the housing are correspondingly assembled. The housing is provided with a sound guiding channel which realizes sound transmission to the microphone. A sealing structure is arranged between the microphone and the housing, thereby forming a sealed space which can be communicated with outside only through the sound guiding channel between the microphone and the inner end of the sound guiding channel. After water enters the sound guiding channel, the water remains in the sound guiding channel by means of a surface tension, thereby preventing water entry into the sealed space through the sound guiding channel. According to the microphone waterproof structure, after the water enters the sound guiding channel, the water remains in the sound guiding channel by means of the surface tension, and the sealed space is extruded. On the condition that combination of an external pressure and a water pressure does not exceed a preset pressure, the microphone waterproof structure is a sealed container for water and air except for the sound guiding channel, thereby preventing microphone function failure caused by water entry into the sealed space.

A speaker diaphragm which has a high rigidity and can improve sound transmission speed for better sound quality is provided. The speaker diaphragm contains fibers of 3 to 50 mm length mixed in matrix resin. The fibers are oriented radially from center to periphery in surface layers of the diaphragm, while they are oriented in different directions in a middle layer. After setting the resin, these fibers are fixed in the matrix resin with certain tension applied thereto.

The invention provides an electronic device and a call answering method. The electronic device comprises: an outer shell comprising a first surface and a second surface facing to different directions,a first sound transmission hole located on the first surface and a second sound transmission hole located on the second surface; a receiver comprising a sound playing port, wherein the receiver is arranged in the outer shell, and the receiver comprises a first state in which the sound playing port faces to the first sound transmission hole, and a second state in which the sound playing port facesto the second sound transmission hole; and a direction adjustment device connected with the receiver and used for controlling the movement of the receiver and locating the receiver in the first stateor the second state, so that in the case that the electronic device has only one receiver, a user can perform normal voice answering while receiving calls by using different surfaces of the electronic device.

The invention provides a wireless digital microphone system comprising a wireless microphone and a wireless receiver, wherein the wireless microphone is composed of a sound receiving module, a sound processing module and a sound transmission module which are connected in sequence; the wireless receiver comprises a sound receiving module, a sound demodulation module, a filtering module and an output module which are connected in sequence; the wireless receiver also comprises an audio processing module and a microcomputer processing module, the audio processing module is a DSP (Digital Signal Processor) audio processor, the microcomputer processing module is a single chip microcomputer unit, and the DSP audio processor and the single chip microcomputer are applied to the sound processing of the wireless digital microphone system to change the sound style. A frequency shifter is applied to the wireless digital microphone system to realize feedback inhibition on screeching. The functional combination of the wireless digital microphone system and an effector is realized, and the functions of network singing, intelligent recording and broadcasting, video exchange, intelligent center control and the like are realized by downloading and installing software from an internet platform. In addition, the system is simple in structure, convenient to operate, low in required cost and good in tone quality.

A method for analyzing sound transmission paths in a system from a sound source to a receiver in which the all sound paths are first identified from the sound source to the receiver. These sound paths include both structure-borne sound paths and air-borne sound paths. The transfer function from each path to the receiver is measured in terms of particle velocity vector by using a particle velocity sensor or a set of sound pressures by using a microphone array. The load at each path is directly measured or indirectly estimated in the actual source operation. The load at each path is multiplied by the transfer function from the path to the receiver, which represents the contribution of the path to the response at the receiver.

The invention relates to the technical field of sound box loudspeakers, and discloses a telescopic dustproof sound box loudspeaker. The telescopic dustproof sound box loudspeaker comprises a sound boxshell, a loudspeaker main body is fixedly connected to a lower surface in the sound box shell, a first telescopic pipe is movably connected in the sound box shell, and sliding slots are formed in both side faces in the sound box shell. The telescopic dustproof sound box loudspeaker is provided with the sound box shell, the first telescopic pipe and a second telescopic pipe, by changing the locations of the first telescopic pipe and the second telescopic pipe, the length of a sound transmission portion of the loudspeaker main body is telescopic, the heights of the first telescopic pipe and thesecond telescopic pipe are controlled by setting an insertion groove, an insertion rod, a screw and an extrusion block, the telescopic length can be adjusted, dust protection is performed on the loudspeaker main body by setting a dust cover, a first dust guard plate and a second dust guard plate, and by setting a first sound transmission hole and a second sound transmission hole, the dustproof effect of the loudspeaker main body is better, and the sound transmission is not affected.