Acoustics inventions 02/06

20060037807 - Portable terminal apparatus: The present invention relates to a portable terminal apparatus with a telephone function such as a portable telephone, which has a structure capable of efficiently emitting a voice from a speaker from both a front face and a backside of a housing. The portable terminal has: a first cover that...

20060037808 - Active exhaust muffler: An active exhaust muffler for an exhaust system of an internal combustion engine, having a housing through which a pipe system passes, the pipe system designed to be permeable for airborne sound in a first space, having an antisound generator which is arranged in a second space and antisound acting...

20060037809 - Active/passive distributed absorber for vibration and sound radiation control: The active/passive absorber for extended vibration and sound radiation control includes principally two layers. The first layer has a low stiffness per unit area which allows motion in the direction perpendicular to its main plane. The second layer is principally a mass layer. These two combined layers have a frequency...

20060037810 - Muffler for pneumatic tools: A muffler for removably installing onto a pneumatic tool. A muffler housing has a deflector plate dividing the tool exhaust gases into streams of gas. The streams impinge upon an airfoil rotatably mounted within the housing mixing the streams and gas pulses in a more uniform mixture which then is...

20060037811 - Muffler assembly: A muffler assembly is provided including a diffuser adapted to expand exhaust gas entering the muffler assembly, an insert with at least one opening through which exhaust gas passes to exit the muffler assembly, and a baffle-less sound dampening portion to muffle engine sound. Preferably, the muffler assembly is of...

20060037812 - Acoustic fluid machine: An acoustic fluid machine such as an air compressor comprises an acoustic resonator, a valve device and a piston. Air is sucked into the resonator through the valve device at one end of the resonator. The piston at the other end of the resonator is reciprocated by an actuator to...

20060037814 - Exhaust system of internal combustion engine: In an exhaust system, exhaust manifolds are connected to two banks provided in a V-type engine of a vehicle, respectively, to which front pipes each having a catalytic converter are connected to the exhaust manifolds, respectively. A muffler is provided at an exhaust downstream side of the exhaust pipes, and...

20060037813 - Noise reduction structure for hybrid vehicle: A noise reduction structure for a hybrid vehicle in which a cover covers at least part of an air intake system connected to an engine capable of giving power to a driving wheel, an exhaust muffler constituting part of an exhaust system connected to the engine, and an electric motor...

20060037815 - Particulate insulation materials: A particulate insulation comprises a plurality of particles. Each of the particles has a density of at least about 1 g/cm3 and includes a material that is viscoelastic, elastomeric, and/or polymeric. The particles are substantially non-toxic, non-hygroscopic, odorless, and resistant to volatile organic compound (VOC) emissions....

20060032698 - Passive sound reflector: A passive acoustic reflector comprising of two flat side walls and one curved back wall of sound reflective material. The shape and acoustic reflection aids a musician in the ability to better hear themselves in practice and performance the way they sound to someone who is adjacent to their instrument....

20060032699 - Resonator for vehicle: A resonator for a vehicle includes a first part and a second part joined to each other, to form a tank-like structure. A neck part is projectedly formed on the first and second parts to communicate the inside and outside of the resonator with each other. A rubber seal member...

20060032700 - Noise reduction technique for snowmobiles: An air intake that reduces the transmission of noise from an internal combustion engine while maintaining high air intake flow rates. The air intake has a duct for delivering air to an internal combustion engine, and resonator volumes in communication with the inside of the duct, to selectively attenuate engine...

20060027419 - Blast compression wave absorbing device: A blast compression wave absorbing device comprises a container filled with gas or air under pressure below ambient pressure (under vacuum). The device is positioned close to the facility or structure being protected, in atmosphere or under water. When a blast compression wave reaches the device, in accordance with various...

20060027420 - Semi-active muffler: A semi-active muffler has a casing, an inlet pipe for exhaust gas, at least one outlet pipe for the exhaust gas, a valve element controlling flow of exhaust gas, a spring cooperating with the valve element and biasing the valve element into a first position. Cooling means are provided for...

20060021823 - Noise isolation sheet: There is provided a noise isolation sheet 10 which is comprised of an optional number of closed-cell foamed layer 11, open-cell foamed layer 12 and fibered noise absorbing material 13, being laminated in an optional order, and which insulates the noise near 1000 Hz. Further, there is provided a noise...