Abstract: A method of producing an acoustic radiation pattern, the method comprising receiving an input audio signal representing a first acoustic radiation pattern, generating an acoustic monopole and an acoustic dipole based on the input audio signal, wherein generating the acoustic monopole and the acoustic dipole is to produce a second acoustic radiation pattern substantially similar to the first acoustic radiation pattern.

Abstract: A method of producing an acoustic radiation pattern, the method comprising receiving an input audio signal representing a first acoustic radiation pattern, generating an acoustic monopole and an acoustic dipole based on the input audio signal, wherein generating the acoustic monopole and the acoustic dipole is to produce a second acoustic radiation pattern substantially similar to the first acoustic radiation pattern.

Abstract: Embodiments of the invention are directed to systems, methods and computer program products for interpolating impedance data associated with an electronic device. The present invention enables faster electronic device impedance analysis which in turn will have an impact on memory allocation associated with a computing system that controls the electronic device. An exemplary method comprises receiving complex impedance data; converting the complex impedance data to polar impedance data, wherein the polar impedance data defines a Kennelly circle; normalizing the polar impedance data based on at least one parameter associated with the Kennelly circle; and interpolating the polar impedance data for a selected frequency.

Abstract: A speaker arrangement is described, suitable for improving the sound quality of a small size first speaker. The arrangement comprises a cavity, to which the first speaker is acoustically coupled. A second speaker is also acoustically coupled to the cavity, and the first and second speakers are excited in phase with each other. The first speaker may be an earphone speaker tuned to be held to a user's ear, whereas the second speaker may be a larger ring alert speaker with lower compliance than the first speaker, both of which are incorporated in the same mobile phone. By exciting the second speaker in phase with the first speaker, the second speaker will aid the smaller first speaker's reproduction of sound, particularly in the lower frequency range.

Abstract: The present invention relates to an electro-acoustic communications unit (10) and a portable communication device (20, 30) for producing a desired frequency characteristics in alert mode and phone mode, comprising a housing with a wall (12) defining an interior, having a certain volume and an exterior of the housing, an acoustic driver (14) for generating acoustic signals, said acoustic driver (14) being mounted to the wall (12), an acoustic port (16, 26), having a length and a cross-sectional area, said port (16, 26) penetrating the wall (12) and connecting the interior of the housing with the exterior of said housing, where the volume, length and cross-sectional area are dimensioned in relation to the acoustic driver (14) in a way such that said electro-acoustic communications unit achieves a desired frequency characteristics when engaging the exterior end (22, 32) of said acoustic port of the communications unit with a user's ear (18).

Abstract: The present invention relates to an electro-acoustic communications unit (10) and a portable communication device (20, 30) for producing a desired frequency characteristics in alert mode and phone mode, comprising a housing with a wall (12) defining an interior, having a certain volume and an exterior of the housing, an acoustic driver (14) for generating acoustic signals, said acoustic driver (14) being mounted to the wall (12), an acoustic port (16, 26), having a length and a cross-sectional area, said port (16, 26) penetrating the wall (12) and connecting the interior of the housing with the exterior of said housing, where the volume, length and cross-sectional area are dimensioned in relation to the acoustic driver (14) in a way such that said electro-acoustic communications unit achieves a desired frequency characteristics when engaging the exterior end (22, 32) of said acoustic port of the communications unit with a user's ear (18).

Abstract: In a method of controlling a vibrator, the vibrator is first driven towards a first frequency during a first interval and then is driven towards a second frequency during a second interval. In a preferred embodiment the first frequency is higher than the lowest resonance frequency of the vibrator and the vibrator is then allowed to reduce the frequency to a frequency lower than the resonance frequency. By letting the frequency vary in a pulsating manner in the vibrating device, the vibration can be sensed more easily by a human, and thereby making it possible to use a very small mass in the vibrating device, which therefore can be made using a small weight, while still making it possible to sense the vibration.

Abstract: A device for increasing heat transfer from an object includes at least one oscillating membrane for generating air motion in air surrounding the object, and a nozzle for affecting the air motion so that the air motion causes a continuous exchange of the air surrounding the object.

Abstract: A process for expanding expandable thermoplastic microspheres containing a blowing agent which will be volatilized at heating. A slurry of the unexpanded spheres is fed to a pressure zone together with steam whereby volatilization of the blowing agent occurs in the zone and the expanded microspheres are then allowed to leave the zone at a considerable pressure drop.