1470 results about "Magnetic signal" patented technology

A method and apparatus is provided for magnetic source magnetic resonance imaging. The method includes collecting energy signals from an object, providing additional information of characteristics of the object, and generating the image of the object from the energy signals and from the additional information such that the image includes a representation of a quantitative estimation of the characteristics, e.g a quantitative estimation of magnetic susceptibility. The additional information may comprise predetermined characteristics of the object, a magnitude image generated from the object, or magnetic signals collected from different relative orientations between the object and the imaging system. The image is generated by an inversion operation based on the collected signals and the additional information. The inversion operation minimizes a cost function obtained by combining the data extracted from the collected signals and the additional information of the object. Additionally, the image is used to detect a number of diagnostic features including microbleeds, contract agents and the like.

A vehicle tracking system includes a wheel containing sensor circuitry capable of sensing various types of conditions, such as wheel rotation, wheel vibration caused by skidding, and specific electromagnetic and / or magnetic signals indicative of particular wheel locations. The sensor circuitry is coupled to an RF transceiver, which may but need not be included within the wheel. The wheel may also include a brake mechanism. In one embodiment, the wheels are placed on shopping carts and are used to collect and monitor shopping cart status and location data via a wireless network. The collected data may be used for various purposes, such as locking the wheel of an exiting cart if the customer has not paid, estimating numbers of queued carts, stopping wheel skid events that occur during mechanized cart retrieval, store planning, and providing location-based messaging to customers.

An adaptive underwater camera housing and control interface for use with a broad range of camera brands and models. The camera housing is preferably formed of front and rear housing sections that are molded of clear transparent plastic and arranged to be moved between an open position for mounting a camera within the housing and a closed position in which the housing provides a watertight enclosure for protecting and communicating with a camera. Residing in the housing are a controller and communications interface by which a camera can be operated from outside the housing. Magnetic signals are preferably passed to the controller by external signal buttons operated by the user. The external signal buttons do not penetrate the interior surfaces of the housing thereby enhancing its water tightness. The housing is provided with a truncated hemispherical lens through which a camera views scenes to be photographed to reduce distortion and not foreshorten viewing angle and a flat window and diffuser for providing controlled artificial illumination to a scene.

A method of localizing a medical device inside a patient's body, the method comprising: transmitting ac magnetic signals between a plurality of points of known location outside of the patient's body and a plurality of points on the medical device inside the patient's body, the signals transmitted between at least some of the points comprising at least two different frequencies; and receiving the transmitted ac magnetic signals and processing the received signals to determine the position of the points on the medical device, and thus the location of the medical device, this processing including correcting for the affects of metal in the vicinity by using the transmitted and received signals at different frequencies. In an alternate embodiment, a reference device is provided inside the patients' body, and the medical device is localized relative to the reference catheter. The use of signals comprising at least two frequencies may or may not be used in this relative localization embodiment, but preferably is used at least to localize the reference catheter.

The magnetic signal reproduction system comprises a magnetic recording medium comprising a magnetic layer comprising a ferromagnetic powder and a binder on a nonmagnetic support and a reproduction head, wherein a number of protrusions equal to or greater than 10 nm in height on the magnetic layer surface, as measured by an atomic force microscope, ranges from 50 to 2500 / 10,000 μm2, a quantity of lubricant on the magnetic layer surface, denoted as a surface lubricant index, ranges from 0.5 to 5.0, a surface abrasive occupancy of the magnetic layer ranges from 2 to 20 percent, the reproduction head is a magnetoresistive magnetic head comprising a spin-valve layer, the spin-valve layer comprises a magnetization free layer, a magnetization pinned layer and an antiferromagnetic layer, and the antiferromagnetic layer is comprised of alloy comprising iridium and manganese, and the reproduction head comes in sliding contact with the magnetic recording medium during signal reproduction.

A device of the same general physical size and shape as a standard audio cassette tape, but which accepts digital information from any of a variety of sources—including for example: Internet transmission, a digital computer, or memory cards (especially digital memory cards)—and plays this digital information through any, for example, standard audio tape cassette player. The device operates by converting the digital representation of the sound into magnetic signals which are presented to the read / write head of the cassette player equipment. The device allows the user of the cassette player to regulate the audio playback using conventional equipment controls such as: START, STOP, REWIND, FAST REWIND, FORWARD, FAST FORWARD, etc. In one exemplary implementation, the device has the same general physical dimensions of a standard audio cassette; at least one digital processor; and a slot into which electronic media such as, for example, memory cards, smart cards having a processor and a memory embodied thereon and other memory media may be inserted. Converter circuitry converts data stored in digital memory to an analog signal which is magnetically coupled to the read head of the equipment. Numerous sensors detect changes in at least one of the tape equipment mechanisms in the audio cassette emulator.

A communication device is disclosed having optical and near-field communication capability. The device includes an optical transceiver circuit fabricated on an integrated circuit die and configured to transmit and receive far field signals. A near field transceiver circuit is also fabricated on the integrated circuit die and is configured to transmit and receive near-field electro-magnetic signals. Control circuitry is provided to selectively enable the optical transceiver circuit and the near field transceiver circuit responsive to an external control signal.

The present invention provides a system, method and apparatus that includes a user device having a magnetic field generator disposed within a substrate that is normally inactive, an initiator mounted on the substrate, a memory disposed within the substrate and a processor disposed within the substrate that is communicably coupled to the magnetic field generator, the initiator and the memory. The processor is operable to process information received from the initiator, generate a time varying code in response to the received information and activate the magnetic field generator. A power source is also disposed within the substrate. The magnetic field generator can create a spatial magnetic signal using a magnetic stripe and one or more induction coils, or create a time-varying magnetic signal for emulating data obtained from swiping a traditional magnetic stripe card through a magnetic card reader.

An underwater communications system is provided that transmits electromagnetic and / or magnetic signals to a remote receiver. The transmitter includes a data input. A digital data compressor compresses data to be transmitted. A modulator modulates compressed data onto a carrier signal. An electrically insulated, magnetic coupled antenna transmits the compressed, modulated signals. The receiver that has an electrically insulated, magnetic coupled antenna for receiving a compressed, modulated signal. A demodulator is provided for demodulating the signal to reveal compressed data. A de-compressor de-compresses the data. An appropriate human interface is provided to present transmitted data into text / audio / visible form. Similarly, the transmit system comprises appropriate audio / visual / text entry mechanisms.

Provided is a magnetic recording medium for high-density recording, that has excellent electromagnetic characteristics, error rates, and durability. The magnetic recording medium comprises a magnetic layer comprising a ferromagnetic powder, a binder and an abrasive on a nonmagnetic support and is employed for recording a magnetic signal on the medium and reproducing the recorded signal with a reproduction head. The abrasive has a Vickers hardness ranging from 18 to 80 GPa and a mean particle diameter ranging from 10 to 100 nm. The magnetic layer comprises the abrasive in a quantity of 5 to 60 weight parts per 100 weight parts of the ferromagnetic powder and has a thickness ranging from 10 to 100 nm. The number of abrasive present on the surface of the magnetic layer ranges from 0.01 to 1 per {(minimum bit length of the recorded signal)×(read track width of the reproduction head)} micrometer2.

A chopped Hall effect sensor topology includes a switched Hall plate, an amplifier responsive to an output of the switched Hall plate and a filter stage responsive to the output of the amplifier and including an anti-aliasing filter and a selective filter that is tuned to the modulation frequency. The switched Hall plate includes a Hall element and a Hall plate modulation circuit that modulates the Hall offset signal component or the magnetic signal component. In embodiments in which the Hall offset signal component is modulated by the switched Hall plate, the amplifier, if chopped, includes an even number of additional modulation circuits. In embodiments in which the magnetic signal component is modulated by the switched Hall plate, the amplifier contains an odd number of modulation circuits. The described topology provides a low noise, fast response time Hall effect sensor.

An aspect of the present invention relates to a magnetic recording medium comprising a magnetic layer comprising a ferromagnetic powder and a binder on a nonmagnetic support. A height of protrusions with a protrusion density of 0.002 protrusion / μm2 or lower on a surface of the magnetic layer as measured by AFM is 40 nm or lower; a density of protrusions that are 15 nm or higher in height on the surface of the magnetic layer as measured by AFM ranges from 0.01 to 0.18 protrusion / μm2; and the protrusions that are 15 nm or higher in height include protrusions formed of carbon black and protrusions formed of a substance with a Mohs' hardness exceeding 7, and an average height of the protrusions formed of carbon black is greater than an average height of the protrusions formed of the substance with a Mohs' hardness exceeding 7.

An apparatus having a plurality of coils (e.g., numerous thin-film coils formed in an array on a flex circuit), each coil acting as an excitation unit that generates an alternating excitation magnetic signal; and as a sensor configured to detect an eddy-current signal's phase and amplitude changes relative to the excitation magnetic signal. In some embodiments, the apparatus electronically scans a surface (e.g., of a metal plate) by successively switching to individual ones of the plurality of excitation / sensing coils (using, e.g., an analog multiplexer) without physical movement in order to detect anomalous signal changes in a manner that reduces signal changes due to probe lift-off relative to the surface. In some embodiments, the coils are placed across a large area of interest, for inspection of a large surface area in a few seconds without moving the apparatus. This can provide high-sensitivity detection and an accurate indication of flaw locations.

Provided is a magnetic recording medium capable of achieving high reproduction output in a short wavelength region. The magnetic recording medium comprises a nonmagnetic layer comprising a nonmagnetic powder and a binder and a magnetic layer comprising a ferromagnetic powder and a binder in this order on a nonmagnetic support. The magnetic layer has a squareness ranging from 0.6 to 1.0 in a perpendicular direction, and the magnetic recording medium is employed for recording a magnetic signal on the medium in a longitudinal direction at a linear recording density of equal to or greater than 300 Kbpi using a recording head with a gap length of equal to or less than 0.3 micrometer, and reproducing the magnetic signal using a magnetoresistive head with a shield spacing of equal to or less than 0.2 micrometer.

A device of the same general physical size and shape as a standard audio cassette tape, but which accepts digital information from any of a variety of sources—including for example: Internet transmission, a digital computer, or memory cards (especially digital memory cards)—and plays this digital information through any, for example, standard audio tape cassette player. The device operates by converting the digital representation of the sound into magnetic signals which are presented to the read / write head of the cassette player equipment. The device allows the user of the cassette player to regulate the audio playback using conventional equipment controls such as: START, STOP, REWIND, FAST REWIND, FORWARD, FAST FORWARD, etc. The device has the same general physical dimensions of a standard audio cassette; at least one digital processor; and a slot into which electronic media such as, for example, memory cards, smart cards having a processor and a memory embodied thereon and other memory media may be inserted. Numerous sensors detect changes in at least one of the tape equipment mechanisms in the audio cassette emulator. Various cryptographic techniques are described for protecting the unauthorized distribution of audio information.

A welding-type system is designed for wireless control and for inventory monitoring of welding consumables. The welding-type system includes a power source to produce a welding-type power, wherein the power source is operable in a plurality of operating modes. The welding-type system also includes a controller configured to set a plurality of operating parameters within the power source, at least one wireless monitoring device coupled to the controller, and at least one welding-type consumable associated with a wireless transmitter. The wireless transmitter is configured to emit low frequency magnetic signals having consumable data encoded therein that is indicative of the at least one welding-type consumable. The wireless monitoring device is arranged to communicate with the wireless transmitter by receiving and transmitting the low frequency magnetic signals, with the low frequency magnetic signals being transmitted at a frequency of approximately 131 kHz.

A magnetic recording medium (10) has a substrate (12) and a perpendicular magnetic recording layer (30) formed over the substrate (12). The perpendicular magnetic recording layer (30) has a granular layer (20) in which a magnetic signal is recorded and a continuous film layer (24) magnetically coupled to the granular layer (20). The continuous film layer (24) has hard magnetic portions (204) formed in positions corresponding to the recording regions where magnetic signals are recorded in the granular layer (20) and magnetic shield portions (202) formed between the hard magnetic portions (204), each having a magnetization curve whose slope is larger than those of the hard magnetic portions in the region where the applied magnetic filed is zero when the magnetization curve is measured, and each having a residual magnetic polarization smaller than those in the hard magnetic portions.

Provided is a magnetic encoder which includes plural rows of magnetic encoder tracks. One magnetic encoder track of the magnetic encoder tracks includes magnetic pattern magnetized thereto to generate signals of equal pitch for detection of rotation. The magnetized magnetic pattern includes N poles and S poles arranged in alternate fashion. The magnetic encoder is configured to be employed spaced through an air gap from sensors that read magnetic signals of the respective magnetic encoder tracks. The magnetic encoder track is configured such that the magnetic pattern thereof acting on position of the corresponding sensor is, under the interference of magnetism of the plural rows of magnetic encoder tracks, detected by the corresponding sensor as an equal pitch magnetic pattern.

A method and an apparatus are provided for magnetic source magnetic resonance imaging. The method includes collecting energy signals from an object, providing additional information of characteristics of the object, and generating the image of the object from the energy signals and from the additional information such that the image includes a representation of a quantitative estimation of the characteristics. The additional information may comprise predetermined characteristics of the object, a magnitude image generated from the object, or magnetic signals collected from different relative orientations between the object and the imaging system. The image is generated by an inversion operation based on the collected signals and the additional information. The inversion operation minimizes a cost function obtained by combining the data extracted from the collected signals and the additional information of the object. Additionally, the image is used to detect a number of diagnostic features including microbleeds, contract agents and the like.

These and other objects of the present invention are achieved in a card reader with a read head positioned in a housing. The read head is configured to be coupled to a mobile device and has a slot for swiping a magnetic stripe of a card. The read head reads data on the magnetic stripe and produces a raw magnetic signal indicative of data stored on the magnetic stripe. A power supply is coupled to wake-up electronics and a microcontroller. An output jack is adapted to be inserted in a port of the mobile device and deliver an output jack signal to the mobile device.

The present invention provides a magnetic head device exhibiting a good bonded state of a piezoelectric element and a load beam, and excellent reliability. The magnetic head device includes a slider provided with a reproducing element for detecting a magnetic signal recorded on a recording medium, and a recording element for recording a magnetic signal on the recording medium, an elastic supporting member for supporting the slider, and piezoelectric elements mounted on the elastic supporting member, for distorting the elastic supporting member to change the position of the slider. The piezoelectric element and the elastic supporting member are bonded together with a photo-curing and thermosetting epoxy adhesive resin having a Young's modulus of 1 GPa or more at 25° C., and a glass transition temperature of 90° C. or more.

A card reader is provided with a read head with a slot and is configured to be coupled to a mobile device and has a slot for swiping a magnetic stripe of a card. The read head reads data on the magnetic stripe and produces a raw magnetic signal indicative of data stored on the magnetic stripe. A power supply is coupled to wake-up electronics and a microcontroller. An output jack is adapted to be inserted in a port of the mobile device and deliver an output jack signal to the mobile device. The wake-up electronics is powered by a microphone bias of a mobile device.

A method of transmitting information to a mobile device uses a card reader that has an asymmetric spring. The card reader includes a housing with length, height and width dimensions, a read head with a slot, a microcontroller, an output jack and the asymmetric spring coupled to the read head. The asymmetrical spring positions the read head to be offset in the housing, with the housing length and height edges being non-symmetrical in respect to the length and height edges of the read head. A card is slid in the slot. Data is read from the magnetic stripe; A raw magnetic signal is produced indicative of data stored on the magnetic stripe. The raw magnetic head signal is converted into a processed digital signal that the microcontroller can interpret. An output jack signal is sent to the mobile device.