Abstract: To provide leak tolerance an acoustic system for an acoustic receiver comprises a loudspeaker, a front cavity, a rear cavity and an acoustic connection. The loudspeaker has a front area and a rear area opposite the front area the front area having an opening through which sound is output. The front cavity is in proximity to the front area of the loudspeaker, the opening outputting into the front cavity, and the front cavity having a port to the exterior of the acoustic receiver. The rear cavity is in proximity to the rear area of the loudspeaker. The acoustic connection is between the front cavity and the rear cavity. In some embodiments, the rear cavity comprises an acoustic leak to the exterior of the rear cavity.

Abstract: A method and battery are provided comprising a case having a first electrode and a second electrode, a first conductor having a first portion for directing a first current from a first electrode, a second conductor having a first portion for directing a second current from a second electrode, a second portion of the first conductor for carrying the first current in a first direction, and a third portion of the first conductor for carrying the first current respectively in a second direction. The first portion of the first conductor and the first portion of the second conductor are substantially symmetric and proximate. The second portion and the third portion are outside a case, and the first direction is substantially opposite from the second direction. The second portion and the third portion are proximate and separated by an insulator.

Abstract: An illustrative embodiment provides an apparatus comprising a positive electrode, a negative electrode, a separator, a first conductor, and a second conductor. The positive electrode and the negative electrode are separated by the separator. The first conductor is configured to transmit a first electrical current from the positive electrode. Also, the second conductor is configured to transmit a second electrical current from the negative electrode. A direction of the first electrical current transmitted through the first conductor is substantially opposite to a direction of the second electrical current transmitted through the second conductor. A magnitude of the first electrical current is substantially equal to a magnitude of the second electrical current.

Abstract: A communication device, and battery there for, are provided. In at least one of the battery and the communication device is provided a magnetic shield portion for routing magnetic flux away from the receiver when the radio is in operation. The magnetic shield portion can be incorporated into at least one of the battery and the communication device. When the battery is inserted into mobile communications devicemobile communication device, the magnetic shield portion is located substantially between a battery portion, in the battery, and the receiver.

Abstract: A low magnetic interference battery is provided, the battery insertable into a mobile communication device, the mobile communication device comprising a radio interconnected with a microphone and a receiver. The battery comprises a battery portion enabled to provide electrical power to the radio, the battery portion emitting a magnetic field when in operation. The battery further comprises a sealing portion for sealing the battery portion therein such that the battery portion is protected from moisture, the sealing portion comprising a magnetic shield portion arranged relative to the battery portion such that magnetic flux from the battery portion is routed away from the receiver when the battery is in operation in the mobile communication device.

Abstract: A battery, comprising a case, an electrode assembly within the case, wherein the electrode assembly includes a positive electrode and a negative electrode, and positive and negative conductors electrically connected to the positive and negative electrodes, respectively, at a substantially similar point on the respective electrode assembly such that current flows in opposite directions through the positive and negative electrodes. The positive and negative conductors are closely routed so as to be aligned and in close proximity. As a result, magnetic fields generated by the positive and negative electrodes and the positive and negative conductors are substantially cancelled.

Abstract: A mounting arrangement for a handset, neckset and the like having a transmit and a receive end. A regular-shaped cavity is provided at the transmit end for receiving a higher order microphone capsule, having two or more poles. The capsule is symmetrically fixed with the geometrical center substantially corresponding with the geometrical center of the cavity. The transversal size of the capsule is less or equal to the depth of the cavity. In this way, the capsule is embedded into the cavity, and the cavity is covered with an acoustically transparent screen. There is space left between the poles of the microphone and the facing walls of the cavity for fooling the microphone that it is in free space.

Abstract: An acoustic wave transceiver device comprising a sheet of material which responds electrically to acoustic waves and a signal processor which processes the voltage signal produced by the sheet is disclosed. The sheet has an irregular shape which depends on a width function. The sheet produces a voltage signal representing the convolution of the acoustic signal information in a received wave and the width function. The signal processor deconvolves the voltage signal using said width function which is stored in its memory. A method of selecting the width function (and therefor the shape) based on the Fourier transform of a mathematical relation with orthogonal properties is also disclosed.

Abstract: A proximity detector structure comprising a pair of light guides which are optically isolated from each other, each of the light guides having an end surface at one end thereof, a light source for transmitting light along one of the light guides to its end surface, a light receiver for receiving light carried by another of the light guides, a light emitter at the end surface of the one of the light guides for emitting light carried by the one of the light guides, and a light gathering structure at the end surface of the other of the light guides for receiving light emitted from the light emitter and reflected from an external surface and for passing the received light into the other of the light guides, the light emitter and light gathering structure being shaped so as to couple unreflected light directly from the light emitter to the light gathering structure.

Abstract: A wireless terminal for personal communication systems is provided with handsfree and handset receive modes of operation utilizing a single transducer. The transducer is mounted within a specially designed enclosure having front and back chambers separated by a partition. The partition contains strategically located internal vents and the front chamber contains strategically located acoustic ports for shaping the frequency response and providing good audio quality in each mode. The back chamber may also contain strategically located acoustic ports. Amplification and equalization circuitry may be employed to further adjust the amplifier gain and shape the frequency response for dual mode operation. The terminal may additionally be equipped with a proximity detector to assist in switching between operating modes of operation. The transducer may also be used to generate the alerting (ringing or buzzing) signal.

Abstract: A wireless terminal for personal communication systems is provided with selective handsfree or handset receive mode of operation utilizing a single transducer. The transducer is mounted within a specially designed enclosure having front and back chambers each with strategically located acoustic ports for shaping the frequency response and providing good quality audio in each mode. Electronic equalization may be employed to further adjust the amplifier gain and shape the frequency response for dual mode operation.

Abstract: A miniature loudspeaker assembly comprises a loudspeaker drive unit housed in an enclosure. The drive unit comprises a magnet unit defining a magnetic air gap, a voice coil in the air gap, and a diaphragm coupled to and driven by the voice coil. Magnetic fluid is injected into the air gap to occupy interstices between the voice coil and the poles of the magnet unit. The enclosure has a volume between about one eighth and about double a compliance equivalent volume of the loudspeaker drive unit. Preferably, the enclosure volume is less than or equal to the compliance equivalent volume of the drive unit. The enclosure may have a port. The free space resonant frequency of the ported enclosure may be between about 50 percent and about 60 percent of the free space resonance frequency of the loudspeaker drive unit.

Abstract: A communication device such as a portable wireless terminal for a telephone system having a proximity sensor to automatically switch the receiving transducer from receiver mode to loudspeaker mode. The proximity sensor is positioned in the handset such that the associated circuitry switches the transducer from loudspeaker mode to receiver mode in response to the handset being brought into proximity with the user's ear.