642 results about "Acoustic transmission" patented technology

A wellbore remote control system is disclosed which includes (1) a transmission apparatus for generating at least one acoustic transmission having a particular transmission frequency, (2) a reception apparatus which includes an electronic circuit (preferably digital) which detects and identifies the acoustic transmissions, and which provides an actuation signal to an electrically-actuated wellbore tool if a match is detected.

A method of optimizing the audio performance of an earpiece and the resultant device are provided. The disclosed earpiece combines at least two drivers within a single earpiece. If a pair of drivers is used, each driver has a discrete sound delivery tube. If more than two drivers are used, preferably the outputs from the two lower frequency drivers are merged into a single sound delivery tube while the output from the third driver is maintained in a separate, discrete sound tube. To compensate for the inherent phase shift of the earpiece the lengths of the sound delivery tubes, and thus driver offset, are regulated. Further audio performance optimization can be achieved through an iterative process of measuring the performance of the earpiece and making further, minor adjustments to the sound delivery tube lengths. The sound delivery tubes can include transition regions. The earpiece is configured to use removable / replaceable eartips. Acoustic filters can be interposed between one or both driver outputs and the earpiece output.

A device for generating a binaural signal based on a multi-channel signal representing a plurality of channels and intended for reproduction by a speaker configuration having a virtual sound source position associated to each channel, is described. It includes a correlation reducer for differently processing, and thereby reducing a correlation between, at least one of a left and a right channel of the plurality of channels, a front and a rear channel of the plurality of channels, and a center and a non-center channel of the plurality of channels, in order to obtain an inter-similarity reduced set of channels; a plurality of directional filters, a first mixer for mixing outputs of the directional filters modeling the acoustic transmission to the first ear canal of the listener, and a second mixer for mixing outputs of the directional filters modeling the acoustic transmission to the second ear canal of the listener. According to another aspect, a center level reduction for forming the downmix for a room processor is performed. According to even another aspect, an inter-similarity decreasing set of head-related transfer functions is formed.

An apparatus and method of detecting COPD and in particular, emphysema utilizes a change in acoustic transmission characteristics of a lung due to e.g. the appearance of fenestrae (perforations) in the alveoli of the lung. The use of acoustic signals may provide good sensitivity to the existence of alveolar fenestrae, even for microscopic emphysema, and the appearance and increase in fenestrae may be determined by monitoring acoustic transmission characteristics such as, for example, an increase in acoustic signal velocity and velocity dispersion, and / or a change in attenuation. A transmitter may be located in e.g. the supra-clavicular space and receivers may be mounted on the chest. Measurements may be correlated between pairs of receivers to determine acoustic transmission profiles.

A wireless acoustic transmission device used in an acoustic offering service having superior convenience, includes wireless transmitter for transmitting the service request signal to request the desired acoustic signal, a wireless receiver for receiving the transmission signal containing the acoustic signal to be transmitted in response to the service request signal, a demodulator and decoder for restoring the acoustic signal applying the demodulation and / or decoding processing to the receiving signal transmitted from the wireless receiver, and an electro-acoustic transformer for transforming the acoustic signal restored by the demodulator and decoder the radio waves and for outputting. Accordingly, the desired acoustic signal can be easily obtained without having the recording medium on which the acoustic signal is recorded, and the acoustic offering service having superior convenience can be realized.

A wired or wireless earset assembly includes an earset housing having a curved portion configured to fit to the top of an ear, a speaker driver contained in a speaker housing, a flexible tube having a first extension so as to be coupled with at least a part of the curved portion of the earset housing and a second extension coupled with the speaker housing, a rotatable cap containing a bud coupled with the speaker driver, a sound delivery port in the bud, a circuitry for processing an input signal in the case, and a wire in the flexible tube connecting the circuitry and the speaker driver.

The present invention discloses a test device and test method for the noise reduction headphone. The test device comprises: an enclosed cavity, a noise source, a test panel, a measuring microphone and a measure comparison module connected with the measuring microphone. The sound emitted from the noise source is sealed within the enclosed cavity. The test panel can cooperate with the noise reduction headphone to form a coupling cavity in the test. The test panel has a sound guiding hole in the common part with the enclosed cavity for transmitting the sound of the noise source into the interior of the coupling cavity. The test panel also has a mounting hole, and the measuring microphone is mounted on the mourning hole towards the direction of the coupling cavity. The measuring microphone records noise signals before and after the noise reduction function of the noise reduction headphone is activated. The measure comparison module receives the signals recorded these two times by the measuring microphone and performs comparison processing to obtain noise reduction amount of the noise reduction headphone. The technical solution of the present invention solves the problem of noise pollution caused by high-power external noise sources to the surrounding environment during the test process of noise reduction amount of the headphone, meanwhile, no special shielding room is required, and the requirement on test environment is relieved.

In thermal pulse flow measurements a relatively small bolus of flowing fluid is heated or cooled and the time required for the bolus to move downstream a known distance is measured. In many fluids, changing the temperature changes the acoustic transmission properties of the bolus from those of the rest of the fluid, so the bolus can be detected when it intersects an acoustic beam. The use of an acoustic beam or beams, which are usually defined between acoustic transmitting receiving transducers, typically provides a high frequency carrier which is modulated by the change in acoustic properties of the bolus when it passes between the two transducers. When compared to conventional thermal measurements, this acoustic approach provides faster response times and can thus be used for measuring higher flow rates.

Composite laminate interlayers for adhering a glass laminate comprising a sheet of polyethylene terephthalate (PET) between layers of plasticized polyvinyl butyral (PVB) adhesive layers, wherein at least one of the PVB adhesive layers is stiffened, e.g. by reduction in the amount of plasticizer, and has a glass transition temperature greater than 35° C. The PET is preferably 0.075 to 0.25 mm (3-10 mils) thick and can have a functional coating for reducing radiation, e.g. UV or IR or visible light, transmission through the glass laminate. The laminate can also comprise at least one elastomeric layer adapted to reducing sound transmission through the glass laminate. The laminates exhibit enhanced maximum flexural modulus of greater than about 350 Newtons / centimeter.

A sensor system immersible in an ambient-fluid for sensing at least two conditions of the ambient fluid, includes a sealed chamber filled with a reference fluid of a known composition and / or pressure, and two acoustic transmission channels, one including the reference fluid, and the other including the ambient fluid. Measuring circuitry measures (a) the transit time of an energy wave through one transmission channel to determine the temperature of the fluid within the sealed chamber and thereby the temperature of the ambient fluid; and (b) the transit time of an energy wave through the other transmission channel to determine the composition and / or the pressure of the ambient fluid.

A method for estimating the composition of a fuel within an engine, comprises performing the following steps under ambient conditions: (a′) determining the ambient temperature of the fuel; (a) monitoring the fuel pressure inside a fuel rail of the engine over a period of time; (b) calculating at least one frequency component of the change in fuel pressure; (c) calculating the speed of sound transmission c on the basis of the at least one frequency component; and (d) estimating the composition of the fuel on the basis of the calculated speed of sound transmission at said ambient temperature. Suitably, the speed of sound transmission in the fuel is calculated using the equation: c=fλ, where the wavelength λ of the standing wave with frequency f is 2L, where L is the length of the fuel rail. Also described are methods for estimating the temperature of the fuel at a non-ambient temperature, and determining a fuels physical properties. Methods for controlling a fuel injection system in an engine according to the determined physical properties of the fuel and the resultant fuel injection system are also described.

A system for providing sound to at least one user, having an audio signal source; a transmission unit with a digital transmitter which wirelessly transmits audio signals digitally as data packets, at least one receiver unit with at least one digital receiver and a mechanism for stimulating user hearing. Each data packet is transmitted in a separate slot of a TDMA frame at a different frequency according to a frequency hopping sequence, the first slot of each frame being a beacon packet containing hopping frequency information. Each receiver unit passively synchronizes to the transmission unit without sending messages to it by periodically waking to listen for the beacon packets, the listening frequency channel changing according to a fixed scheme from listening period to listening period, the beacon listening periodicity differing from the beacon transmission periodicity, each receiver unit switching into a synchronized mode after successful receipt of a beacon packet.

A drill pipe forms an acoustic transmission channel for data to be transmitted from a downhole transceiver to a surface transceiver. By positioning a first low frequency acoustic attenuator between a drill bit and the downhole transceiver, acoustic noise generated by the drill bit is attenuated. Similarly, by positioning the surface transceiver between the top of the drill pipe and a second low frequency acoustic attenuator, acoustic noise generated by surface equipment is attenuated. In this manner, the first and second low frequency acoustic attenuators serve as terminators for the acoustic transmission channel. Finally, by combining a third low frequency acoustic attenuator positioned between first and second sections of the drill pipe with first and second acoustic transceivers acoustically isolated from one another by the third low frequency acoustic attenuator and non-acoustically coupled to one another for bi-directional exchanges of signals, an acoustic repeater is provided for the transmission channel.

The present invention provides a sound-transmitting membrane for a microphone, to be disposed to a sound-collecting opening of the microphone so as to allow sound to transmit through the membrane while preventing a foreign matter from entering into the microphone through the opening. This membrane for a microphone prevents the entry of a foreign matter, such as fine dust and water vapor, that is difficult for conventional sound-transmitting membranes to block, and ensures the microphone performance. This membrane for a microphone is composed of a nonporous film or a multilayer membrane including a nonporous film, has a surface density of 30 g / m2 or less, and has a sound transmission loss of less than 3 dB in a frequency range of 300 to 4000 Hz.

A whole house fan system and installation methods configured to reduce noise generated by the fan are provided. The system generally includes a fan, a register, and a flexible duct extending between the fan and the register. The flexible duct has acoustical insulation properties, which helps to reduce sound transmission from the fan to the register. The fan system is configured to be mounted in the attic space of a house. The fan motor is suspended in the attic so that it does not have direct contact with any part of the building structure.

The present invention is directed to a pad and sound transmission system which is adapted to directly transmit audible sound waves into the body at high intensity levels. In one embodiment, the subject invention includes a back pad and a seat pad. Each pad includes a speaker module having an acoustic speaker disposed within the pad and surrounded by a plurality of different layers.

A telemetry system having: a pipe; a SCADA box acoustically coupled to the pipe; and a gauge inserted in the pipe, the gauge comprising: an acoustic wave generator; a coupler mechanically connected to the acoustic wave generator, wherein the coupler is engageable and disengageable with the pipe, wherein the coupler defines an acoustic transmission path between the acoustic wave generator and the pipe when engaged with the pipe; and a signal controller in communication with the acoustic wave generator. A method for communicating information in a wellbore from a downhole location to the surface, the method having the following steps: running a downhole gauge into a pipe within the wellbore, wherein the downhole gauge comprise an acoustic wave generator; setting the downhole gauge in the pipe; and communicating an acoustic signal between the downhole gauge and the pipe.

A multi-driver in-ear monitor for use with either a recorded or a live audio source is provided. If a pair of drivers is used, each driver has an individual sound delivery tube. If three drivers are used, the outputs from two of the drivers are merged into a single sound delivery tube while the output from the third driver is maintained in a separate, discrete sound tube. The sound delivery tubes remain separate throughout the end portion of the earpiece. The earpiece tip is configured to be fitted with any of a variety of sleeves (e.g., foam sleeves, flanged sleeves, etc.), thus allowing the in-ear monitor to be easily tailored to comfortably fit within any of a variety of ear canals. Due to the size constraints of such an earpiece, the sound delivery tubes include a transition region. Acoustic filters (i.e., dampers) can be interposed between one or both driver outputs and the earpiece output.

Headsets (20, 50, 60, 71) provide surround sound and full 3 dimensional effects to a user to simulate the effects of direction and sound source. Advantages include: surround sound effect without the limitations of Head-Related Transfer Functions, and pinna effect customized to each user's ears; horn shape tube outlets (32) to create an efficient transmission of sound; ability to space the headset speakers (22, 24) away from the user's ear and to maintain sound quality by addition of a chamber (28) behind the speakers (22, 24), with the aid of tube sound guides (23, 25) and the horn shaped outlets; and, no need for electronic hardware to process the electrical signals to create desired effects as placement of the speakers creates the correct timing, and damping material (34) in the tubes between speakers creates a desired intensity drop. Head tracking capability is also provided.

A device for converting acoustic data collected by a stethoscope into digital data for transmission to a processor for storage and / or comparison with data stored in a database, and to optionally provide computer generated suggestions for diagnosis, is provided in the form of an in-line device interposable between a head of the stethoscope and an acoustic transmission portion of the stethoscope, or is integral with the head, and advantageously has the appearance of an icon of pleasing appearance, for example, a butterfly, in which are incorporated the structural requisites of a functioning stethoscope and / or capabilities for receiving and transmitting to a diagnostician, audio signals gathered from patient examination, and optionally also other data collected at examination and / or following the examination. The butterfly-shaped device, includes a central body advantageously serving as a conduit for transmitting sound received from the patient to the physician or a remote system for analysis and diagnosis.

A metamaterial (400) for attenuating acoustic transmission comprises a plurality of layers (410). Each layer (410) comprises a transmission structure (420) and a resonator (450), coupled to the transmission structure (420). The transmission structure (420) in a layer (410) is coupled to the transmission structures (420) of the layers (410) neighbouring said layer (410). The resonator (450) in a layer (410) is coupled to the transmission structure (420) of the layers (410) neighbouring said layer (410).

In a device for establishing noise in a motor vehicle, comprising a housing which is divided by a sound transmission device into at least two spaces, of which one space is in communication with a gas-carrying part of an internal combustion engine arranged in the motor vehicle and the other space is acoustically coupled to an interior space of the motor vehicle via an outlet line, the outlet line is connected via a hollow rigid deflecting element to an interior space lining element, the rigid deflecting element being capable of transmitting forces applied thereto by the sound radiation to the interior space lining element.

This invention relates to one digital product test method, which adopts digital product and loads with test program software standard audio files and comprises the following steps: the product displaying the standard audio files and sending the sound to the microphone through sound isolation environment; then generating audio files on horn sound; the product uses audio comparison program to compare the audio file and standard frequency files; according to the comparison audio frequency test parameters comparing the audio frequency test parameters and standard parameters to output results. This invention also discloses one special device.

The present universal wearable computing device relates to a hearing assistance system, device, method, and apparatus that provide a discreet approach to user hearing assistance, without relying on a conventional hearing aid. The hearing assistance system and the requisite electronics may be incorporated into frames that also function as eyeglasses with earphone(s) that may be connected to the frame to assist user hearing. An earphone may be configured with minimal electronics, such that a power source enable sound transmissions to the ear, is provided by a connection to the frame of the eyeglasses. In another example, the earphone is configured without any electronics and sound is transmitted to the user / listener's ear(s) via a psychoacoustic system. The sound quality of the transmissions to the earphones may be optimized using a tuning / equalizer application operating from a computing device, such as an app on a mobile device. The tuning / equalizer application can be used by the user / listener to optimize volume input levels to the earphone(s). The hearing assistance system may also protect from damaging environmental noise, provide heightened hearing capabilities, collect and process physiological and physical measurements, and provide communication capabilities for interacting with other computing devices.

A method and apparatus for determining the geophysical position of an autonomous underwater system utilizing underwater acoustic modems that exchange broadband underwater acoustic signals. The method of the invention includes the steps of initiating an exchange of broadband acoustic signals between the autonomous system of unknown geophysical position and a base system of known geophysical position wherein the depths of both systems is known. A bearing calculation is made on one of the signals transmitted between the systems, preferably through the use of an array of hydrophones placed closely together at predetermined locations on either the autonomous or base system. Also, the range between the two systems is determined by measuring the time of travel of at least one signal. By the acoustic transmission and sharing of information, as needed, about the known depths of the systems, the known geophysical position of the base system, and the range between the systems, sufficient data is gathered at one or both systems and used to determine the geophysical position of the autonomous system.

The present invention relates to a sound transmission system using a human body as a propagation medium. The transmission system includes a first signal transmitter and a second signal transmitter respectively generating signals having frequencies corresponding to each other, the first and second signal transmitters being coupled to the human body, wherein the first and second signal transmitters respectively generate high frequency signals having an opposite phase to each other, and the respective signal transmitters combine the audio signals and the high frequency signals to transmit the combined signals to the human body. The respective signal transmitters combine the generated audio signals and high frequency signals, adjust an output phase of the combined signals, and transmit the combined signals through the human body.

A combination of filters for filtering selected wavelengths of electromagnetic radiation is provided on a transparent substrate such as a plastic film or glazing of a window. The combination of filters prevents or attenuates the passage of wavelengths through the substrate which would pose a security risk. The combination of filters is useful to prevent unauthorized data collection and information exchange from or within buildings or otherwise prevent such unauthorized data collection and information exchange from, for example, computer monitors or screens, personal digital assistance, and local area networks. The substrate with the combination of filters may be in the form of a bag or a tent.

A method and apparatus for transmitting power to active touch stimulating devices associated with a touch sensing apparatus. In this invention four methods of providing power supply to the touch-input device are presented. These methods are: EM induction transmission using a single loop antenna, EM induction transmission using a conductive layer, acoustic transmission through air, and acoustic transmission through an acoustic conductive layer.

The invention provides a method for generating an output indicative of acoustical sound transmission in a room. By using e.g. a point cloud representation of an acoustic environment, it is possible to calculate its acoustics from the interior information obtained from the depth camera. This approach is suitable e.g. for run-time applications since it is not based on an audible excitation that can disturb running audio. Also, the point-cloud model can be updated in real time according to the scene changes detected by depth-camera. This allows efficient acoustical simulation of dynamic, interactive environments. Although only geometrical information of a room is provided, high amount of surface details leaves possibility for implementation of material recognition algorithms that involve semantic mapping. This can provide information of reflective properties of surfaces or objects at a point level. Also, a high amount of details allows a good approximation of complex geometries, e.g. porous materials, and rough surfaces, thus a more natural simulation of wave phenomena like diffraction and scattering is possible.