604results about How to "Reduce electromagnetic radiation" patented technology

A voice communication device such as an earpiece that provides for ultra short range transmission of voice sound information using ultra wide band (UWB) radio communications is disclosed. According to one embodiment of the present invention, a voice communication device includes a speaker, a bone conduction sensor for sensing voice sound vibrations, and an UWB transceiver operatively connected to the speaker and the bone conduction sensor. According to another embodiment of the present invention, a voice communication device is disclosed that includes an earpiece housing, a speaker operatively connected to the earpiece housing for transducing audio, an air conduction sensor operatively connected to the housing for sensing voice sound information, a processor electrically connected to the speaker and the bone conduction sensor and disposed within the earpiece housing, and an UWB transceiver operatively connected to the processor.

An easily removable modular optical signal transceiver unit for conversion between modulated light signal transmission and electronic data signals and which conforms to the Small Form Factor standard for transceiver interfaces is disclosed. The structural details of its chassis include aspects which insure the proper positioning of electronic circuit boards of a transmitter optical subassembly and a receiver optical subassembly as well as the positioning of electromagnetic radiation shielding on the chassis. In conjunction with an interface device on an electronic circuit board of a host device, the chassis supports electromagnetic radiation shielding which substantially encloses the sources of electromagnetic radiation within the module and suppresses the escape of electromagnetic radiation, thereby preventing electromagnetic interference with sensitive components and devices in proximity to the module.

Electromagnetic Bandgap (EBG) structures are embedded between adjacent power planes in a multi-layer PCB to decrease the emanation of Electromagnetic radiation induced by power buses, signal layers, as well as to suppress the switching noise. EBG stages with different stop bands are cascaded to create rejection over a wider frequency region. The cascading can be performed in series, or may be formed in a variety of arrangements such as a checkerboard design or concentric ribbons positioned along the perimeter of the PCB. Each EBG stage is composed of conductive patches and via posts extending from each patch, which are positioned at a predetermined distance from each other. By surrounding the source of the noise with EBG stages, a sufficient suppression of electromagnetic noise over specific frequency bands of interest is achieved.

A mobile phone capable of reducing an electromagnetic SAR in human bodies includes a base and a cover disposed on the base. The base includes an antenna for transmitting and receiving electromagnetic waves. The cover includes a screen and buttons. Electromagnetic absorbing materials having electric or magnetic loss are applied on the cover to mitigate electromagnetic waves radiating from the antenna into the user. Moreover, a meandered planar inverted-F antenna is attached to the back of the circuit board near the bottom of the base, which can generate a lower near field at the user's side than those in other directions, thereby reducing the electromagnetic specific absorption rate of the mobile phone in human bodies.

A capacitive sensor system for controlling operation of a device in response to a rate of change in capacitance due to motion of a proximate object includes at least two sense electrodes disposed on a surface and a phase locked loop, including a voltage controlled oscillator and a phase/frequency comparator, connected between the sense electrodes and an RC network for providing an operating frequency to the sense electrodes. A circuit loop, including a reference oscillator, provides a fixed frequency reference for the phase locked loop to follow and a phase delay circuit connected between the phase/frequency comparator and the voltage controlled oscillator causes the voltage controlled oscillator to run ahead of the reference oscillator. A trigger circuit provides a control output in response to a change in phase shift between the fixed frequency and the operating frequency.

A power supply for a Light Emitting Diode (LED) traffic signal that controls the light intensity. The light intensity conforms to a predetermined pattern based on the input voltage root mean square value (V_rms). The input voltage is changed by acting on the amplitude of the sine wave or by using a triac and controlling the angle of fire. The power supply comprises a fuse module, an electromagnetic compatibility filter module, a power supply module, a LED load module, a current monitor module, a RMS-DC conversion module and a fuse blow out module.

A radiation-shielding attenuation structure and method of forming the attenuation structure, wherein the attenuation structure is made by additively manufacturing a concrete material that includes one or more attenuation dopants configured to enhance the radiation shielding of the concrete material. The one or more attenuation dopants may be configured in the concrete material to attenuate one or more types of radiation, such as electromagnetic radiation, gamma radiation, X-ray radiation, or neutron radiation. The attenuation structure formed by the concrete material may be additively manufactured on-site according to a model that has already been pre-certified for safe or secure use, thereby providing a repeatable and reproducible process that can reduce lead times and fabrication costs. The attenuation structure may be easily modified during the additive manufacturing process to have different concrete mixtures with different attenuation characteristics, which increases the tailorability and flexibility in design of the attenuation structure.

In a method of amplifying optical input signals over a wide bandwidth, the optical input signals are applied to an optical waveguide made from a rare-earth-doped amorphous yttrium aluminum oxide material (e.g., erbium-doped yttrium aluminum oxide material). The optical input signals include optical signals having wavelengths shorter than 1,520 nanometers and optical signals having wavelengths longer than 1,610 nanometers. Preferably, the wavelengths range from as short as approximately 1,480 nanometers to as long as approximately 1,650 nanometers. Pump light is applied to the optical waveguide to cause the waveguide to provide optical gain to the optical input signals. The optical gain causes the optical signals to be amplified within the waveguide to provide amplified optical signals over the extended range from approximately 1,480 nanometers to approximately 1,650 nanometers, including, in particular, optical signals having wavelengths shorter than 1,520 nanometers and optical signals having wavelengths longer than 1,610 nanometers. Alternatively, the wavelengths of the optical input signals may be in the range from approximately 1,480 nanometers to approximately 1,565 nanometers. As a further alternative, the wavelengths of the optical input signals may be in the range from approximately 1,565 nanometers to approximately 1,650 nanometers.

Electromagnetic-energy absorbing materials are combined with thermally conductive materials, such as those used for thermal management in association with electronic equipment, thereby suppressing the transmission of electromagnetic interference (EMI) therethrough. Disclosed are materials and processes for combining EMI-absorbing materials with thermally conductive materials thereby improving EMI shielding effectiveness in an economically efficient manner. In one embodiment, a thermally conductive EMI absorber is prepared by combining an EMI-absorbing material (for example, ferrite particles) with a thermally conducting material (for example, ceramic particles), each suspended within an elastomeric matrix (for example, silicone). In application, a layer of thermally conductive EMI-absorbing material is applied between an electronic device or component, and a heat sink

Systems and methods for programming pluggable transceivers are provided. In an embodiment, a method includes receiving RFID data from an RFID device in proximity to a network transceiver via an RFID antenna in the network transceiver, said RFID data defining an operating configuration of the network transceiver; and programming the network transceiver according to the operating configuration defined by the received RFID data. In an embodiment, a network transceiver includes: a host interface for connecting to a host; a network interface for transmitting and receiving signals to and from a network; an RFID antenna for receiving RFID data; and a controller in operative communication with the network interface and the RFID antenna, said controller operating the network interface according to an operating configuration, wherein the operating configuration of the controller is programmed using the RFID data received via the RFID antenna. Various other embodiments are also provided.

An improved structure of a cable featuring an enhanced shield layer, with the arrangement comprised of a conductor, an insulation layer, a metal braid layer, an outer jacket, and an enhanced shield layer disposed between the insulation layer and the metal braid layer. The enhanced shield layer can be conductive plastic, conductive carbon black, conductive colorant, conductive coating, conductive metallic powder, or metal fiber, any of which eliminates electrostatic noise generated by a variety of causes in audio/video cables and thereby solves the problem of electrostatic discharge

Disclosed is a system and method employing a magnetic proximity switch to enable the transfer of power between a power supply unit and a docking unit or to transfer data between a docking unit and a peripheral module such as a disk drive or controller module. Power may be transferred through the switch, or a signal from the switch may be employed to enable a control circuit. The control circuit may control a plurality of voltages or currents and may ramp voltages or currents to limit surge current when a module is installed or removed. The control unit may also be employed to place data and control signals in a high impedance state when a module is not docked, limiting electromagnetic radiation.

A spread-spectrum clock signal generator comprises a circuit loop receiving a reference signal at a reference frequency and adapted to generate an output signal at an output frequency dependent on and locked to the reference frequency, and a modulator circuit generating a modulation signal at a modulation frequency; the modulation signal is injected into the circuit loop to induce a modulation of the frequency of the output signal with respect to the frequency dependent on the reference frequency. The circuit loop is a frequency-locked loop and has a bandwidth sufficiently higher than the modulation frequency, so that the output frequency tracks the modulation signal. Frequency-offset correction means are further provided, for evaluating a frequency offset between an average frequency of the output signal and the frequency dependent on the reference frequency, and for generating a frequency-offset correction signal which is injected into the circuit loop for correcting the evaluated frequency offset.

A garment and method for reducing electromagnetic radiation produced by a transmitting device typically located inside a body. The garment may include material to prevent or lower electromagnetic radiation. A method for using such a garment to lower electromagnetic emissions is described.

A system and method are presented for generating a localized audible sound field at a designated spatial location. The method comprises: providing sound-data indicative of an audible sound to be produced and location-data indicative of a designated spatial location at which the audible sound is to be produced; and utilizing the sound-data and determining frequency content of at least two ultrasound beams to be transmitted by an acoustic transducer system including an arrangement of a plurality of ultrasound transducer elements for generating said audible sound. The at least two ultrasound beams include at least one primary audio modulated ultrasound beam, whose frequency contents includes at least two ultrasonic frequency components selected to produce the audible sound after undergoing non-linear interaction in a non linear medium, and one or more additional ultrasound beams each including one or more ultrasonic frequency components. The location-data is utilized for determining at least two focal points for the at least two ultrasound beams respectively such that focusing the at least two ultrasound beams on the at least two focal points enables generation of a localized sound field with the audible sound in the vicinity of the designated spatial location.