1011results about How to "Improve acoustic performance" patented technology

A sound absorptive multilayer composite having an air-impermeable barrier, an air-permeable reinforcing core having an airflow resistance of at least about 100 mks Rayls and a thickness at least about ⅓ the final composite thickness, an air-permeable open cell foam or fibrous pad having an airflow resistance less than about 2000 mks Rayls and a thickness at least about 1/10 the final composite thickness and a semipermeable airflow-resistive membrane having an airflow resistance of about 500 to about 4000 mks Rayls can provide improved acoustic performance. For example, existing vehicular headliner designs may be improved by adding a properly chosen and properly positioned semipermeable airflow-resistive membrane, a properly chosen and properly positioned air-impermeable barrier, or a properly chosen and properly positioned open cell foam layer.

A permanent magnet synchronous machine with improved torque and power characteristics. A circumferential-oriented rotor assembly is provided with alternating permanent magnets and magnetic pole pieces. In order to reduce the amount of leakage flux in the rotor and increase the effective length of the permanent magnet, a trapezoidal or otherwise tapered permanent magnet structure is used. By alternating trapezoidal permanent magnet, and magnetic pole pieces, a higher intensity magnetic field is created in the air gap utilizing the same radial space in the motor without altering the weight or volume of the motor compared to conventional machines.

An audio speaker having a speaker housing surrounding a back volume that is divided into a rear cavity behind a speaker driver and an adsorption cavity separated from the rear cavity by a permeable partition, is disclosed. More particularly, the adsorption cavity may be defined between the speaker housing and the permeable partition, and may be directly filled with adsorptive particles to adsorb gas during sound generation. The permeable partition may allow the gas to flow between the rear cavity and the adsorption cavity, and may retain the adsorptive particles within the adsorption cavity. Other embodiments are also described and claimed.

Audio apparatus (30) comprising a piezoelectric transducer (44) and coupling means (54) for coupling the transducer to a user's pinna (32) whereby the transducer excites vibration in the pinna (32) to cause it to transmit an acoustic signal from the transducer (44) to a user's inner ear, characterised in that the transducer is embedded in a casing (42) of relatively soft material and the casing (42) is mounted to a housing (34) of relatively hard material such that a cavity (48) is defined between the casing (42) and housing (34). A method of designing audio apparatus comprising mechanically coupling a piezoelectric transducer to a user's pinna and driving the transducer so that the transducer excites vibration in the pinna to cause it to transmit an acoustic signal from the transducer to a user's inner ear, characterised by embedding the transducer in a casing of relatively soft material and by mounting the casing to protective housing of relatively hard material such that a cavity is defined between the casing and housing.

The invention relates to a thin sound absorbing multi-layer assembly, which is intended, in particular, to reduce interior or exterior noise of a motor vehicle. The assembly according to the invention comprises at least three stacked layers consisting respectively of: a first layer (4) being impervious and having an area weight of between (20) to (100 g/m2); a second layer (3) having an air flow resistance of between (250) to (2500 Ns/m3) and an area weight of between (15) to (250 g/m2); a third layer (2) being an open pored, acoustic spring type layer having a thickness of between (2) to (30 mm) and an area weight of between (50) to (1000 g/m2).

The invention relates to a sound box control technology, in particular to a method for correcting a stage and video professional sound system. According to the method, the multilayer adjustable problem of system layers is solved by adopting active speakers (in particular to two-or-more-way sound boxes) with array layer DSP (Digital Signal Processor) parameters and introducing sound box models to virtualize a plurality of layers of DSP parameters; and an array group model is also introduced to implement the synchronization adjustment on each sound box model of an array group. All in all, according to the technology, not only can the difficulty in debugging and correcting the sound system be simplified and the workload is reduced, but also the system debugging can be ensured to obtain a better sound effect.

The invention relates to a sound box control technology, in particular to a method for correcting a sound system. According to the method, the multilayer adjustable problem of system layers is solved by adopting active speakers (in particular to two-or-more-way sound boxes) with array layer DSP (Digital Signal Processor) parameters and introducing sound box models to virtualize a plurality of layers of DSP parameters; and an array group model is also introduced to implement the synchronization adjustment on each sound box model of an array group. According to the technology, not only can the difficulty in debugging and correcting the sound system be simplified and the workload is reduced, but also a better system sound effect can be obtained.

The invention relates to a sound box control technique, in particular to a speaker system regulation method. The method comprises a speaker system model establishing step and a virtual input process parameter correcting step, wherein a speaker system model comprises a plurality of sound box models. Each sound box model is corresponding to a hypostatic active sound box and includes a virtual input process parameter and a virtual output process parameter, the virtual input process parameter includes one or more virtual DSP (digital signal processor) data, each DSP data includes multilayers of DSP parameters in the same type. Thus, no matter how many layers of DSP parameters each hypostatic DSP of the hypostatic sound box includes, the technique can realize multilayer adjustability of the input process parameter in the system layer so as to simplify the operations of debugging and correcting of the speaker system, improve the debugging efficiency, and guarantee the debugging effect of the system.

The invention relates to the electroacoustic technical field, and provides a loudspeaker module and a manufacturing method thereof. The loudspeaker module comprises a case and a single loudspeaker body combined inside the case. The single loudspeaker body comprises a vibrating diaphragm assembly and a magnetic circuit assembly. A front sound cavity and a rear sound cavity are formed between the single loudspeaker body and the case. The case is provided with an elastic part, the elastic part is combined with the end surface of the opening end of the front sound cavity or the rear sound cavity, and the elastic part and the case are of an integrated structure formed in an injection molding mode. By adopting the structure in the loudspeaker module, the process of attaching the elastic part manually is eliminated, the accuracy and the stability of combination of the elastic part are guaranteed, the elastic part does not fall easily, the sealing property between a sound outlet hole of the loudspeaker module and a sound hole of a mobile phone after the loudspeaker module and a terminal electronic product are assembled can be effectively guaranteed, and the acoustic performance is improved. The manufacturing method for the loudspeaker module can solve the technical problems effectively and can be popularized to production for other structures with soft materials or hard materials needing to be injected into other materials.

The invention discloses a double-vibrating-diaphragm speaker module which comprises a single speaker body and a peripheral shell for accommodating the single speaker body. The single speaker body comprises a first vibrating diaphragm, a voice coil, a magnetic circuit and a second vibrating diaphragm, a first sound outlet and a second sound outlet communicating with the outside are formed in the peripheral shell, a first sound cavity communicating with the first sound outlet is formed between the first vibrating diaphragm and the peripheral shell, a second front sound cavity communicating with the second sound outlet is formed between the second vibrating diaphragm and the peripheral shell, a space between the first vibrating diaphragm and the second diaphragm is communicated with a rear sound cavity. The double-vibrating-diaphragm speaker module of the structure can be used with a double-vibrating-diaphragm speaker, so that low-frequency sound effect of the speaker module is improved, and acoustic performance of the double-vibrating-diaphragm speaker module is improved.

The invention concerns a sound-proofing panel, in particular a rotorcraft structural or lining panel: the sound-proofing panel (1) comprises at least two opposite plates (2, 3, 5, 6) forming between them a closed internal space (4), and an aggregate (7) including at least solid elements (8) in contact and which fills entirely said internal space (4).

The invention belongs to the design and manufacturing technology of environment-friendly composite material foaming plate, referring to a vegetable fiber-reinforced biomass resin-based foam plate and a preparation method of the foam plate. A light and high-performance composite material foam plate is manufactured by using vegetable fibers such as ramee, flax, hemp and jute as reinforced body, and loading expansion biomass resin and biomass epoxy resin. The preparation method comprises the steps of manufacturing a fiber felt with a certain thickness by needling or by using adhesive; and carrying out fire retarding or/coupling treatment on the chopped fiber felt; preparing epoxy resin by a MPA (maleopimaric acid anhydride) rosin-based epoxy resin curing agent; preparing epoxy resin into water-based suspension; adding 5-15% (mass percentage) of a microcapsule foaming agent to the suspension; fully immersing the treated fiber felt in the resin suspension, and removing the excess resin; finally, heating the chopped fiber felt immersed by resin for 10-15min in an oven at a certain temperature; after the resin cures, obtaining the vegetable fiber-reinforced biomass resin-based foam plate.