70results about How to "Frequency easy" patented technology

A speaker device includes a magnetic circuit which includes a magnetic gap, a diaphragm which has a recessed part arranged in the magnetic gap and extending in a direction substantially orthogonal with respect to an extending direction of a magnetic flux in the magnetic gap, and a voice coil which is formed into an annular shape and has a first parallel part extending in one direction and a second parallel part extending in a direction in parallel with the first parallel part and opposite to the first parallel part with a constant space. Particularly, the first parallel part and the second parallel part are arranged in a direction in parallel with an extending direction of the recessed part, respectively. The first parallel part is arranged in the recessed part to be positioned in the magnetic gap, and the second parallel part is positioned above the recessed part.

An apparatus for reducing vertical segregation of a discharge lamp. A current / voltage input sweeps through a frequency range between the first azimuthal acoustic resonance mode and a first radial acoustic resonance mode of the discharge lamp. The current / voltage input is subsequently amplitude modulated. Alternatively, without amplitude modulation, the current / voltage input sweeps through the frequency range for a first portion of the period, and then for a second portion of the period drops to a relatively constant frequency.

A wireless communications system, e.g., an OFDM system, uses a plurality of carrier frequencies each with an associated frequency band. A base station sector transmitter in the system transmits ordinary signaling, e.g., user data, in its own assigned band. In addition the sector base station transmitter periodically transmits beacon signals into its own frequency band and the frequency bands used by adjacent sector transmitters for their ordinary signaling. Beacon signals, being short duration high power signals with sector transmission power concentrated on one or a few tones, are easily detectable. Each beacon signal may be identified as to the source base station sector transmitter, e.g., based on tone. A mobile node, tuned to a single carrier band, receives a plurality of beacon signals, identifies the sources of the received beacons, compares the received strength of the beacons, and makes handoff decisions, without having to switch carrier band.

The present invention provides a mass spectrometer having an ion lens capable of transporting an ion having a large mass to charge ratio with a high level of ion-passing efficiency even under a low-vacuum atmosphere. In conventional atmospheric pressure ionization mass spectrometers or similar mass spectrometers, applying an excessively high voltage to the ion lens undesirably causes an electric discharge. Therefore, the passing efficiency for an ion having a large mass to charge ratio cannot be adequately improved, which leads to a poor detection sensitivity. To solve this problem, the mass spectrometer according to the present invention includes a voltage controller 21 that controls a variable radiofrequency (RF) voltage generator 24 so that both the amplitude and the frequency of the RF voltage applied to the lens electrodes of an ion lens 5 are changed according to the mass to charge ratio of an ion to be analyzed. This control enables the ion lens 5 to focus an ion and transport it to the subsequent stage with a high level of passing efficiency even in the case of analyzing an ion having a large mass to charge ratio. Thus, the detection sensitivity is improved. The aforementioned control is conducted on the basis of the control data stored in a voltage control data storage 22. These data are obtained in advance by a measurement of a sample containing a substance having a known mass to charge ratio, in which the intensity of the signal of an ion detector is maintained while the analysis conditions are changed.

A distributed optical fibre sensor is described. The sensor uses a sensor fibre (10) having a low or zero intrinsic birefringence that is responsive to an environmental parameter (24) such as pressure. Probe light pulses having a diversity of launch polarisation states are used to reduce signal fading and polarisation dependent loss in the retardation beat frequency signals which are sensed (20) and then analysed (22) to determine the environmental parameter as a profile along the sensor fibre.

A miniature multi-frequency antenna, comprising at least one dielectric substrate, at least one signal electrode and at least one ground electrode. The signal electrode and the ground electrode are disposed on a substrate. The signal electrode contains at least two branches and at least one branch is partially overlapped with the ground electrode. Each interlayer region between the partially overlapped electrodes forms a specific capacitance. By utilizing this interlayer capacitive effect, the resonant frequency of lower frequency band is achieved while the size of the antenna is effectively reduced. For obtaining the resonant frequency of the high frequency bands, the design concept of PIFA is applied on other branches of the signal electrode. A miniature antenna thus obtained is capable of transmitting / receiving multi-frequency signals having the benefits of easily adjusting impedance and resonant frequency.

In an embodiment, an electroacoustic converter has an enclosure, piezoelectric sounding body, electromagnetic sounding body, passage, and wiring members. The piezoelectric sounding body includes a first vibration plate supported directly or indirectly on the enclosure, and a piezoelectric element placed at least on one side of the first vibration plate. The piezoelectric sounding body divides the interior of the enclosure into a first space and a second space. The electromagnetic sounding body has a second vibration plate and is placed in the first space. The passage is provided at the piezoelectric sounding body or around the piezoelectric sounding body, to connect the first space and second space. The wiring members are electrically connected to the piezoelectric element and led out toward the electromagnetic sounding body, from the piezoelectric element, through the first space or second space.

A mobile communication terminal apparatus includes a non-contact communication section configured to perform non-contact communication with an external terminal apparatus. The non-contact communication section includes a main unit having a controller configured to control communication with the external terminal apparatus and a main antenna, and a sub-unit having a sub-antenna having a coil whose number of windings is smaller than the number of windings of a coil of the main antenna and an adjuster configured to adjust a resonance frequency.

The invention discloses a production method of an optical microwave signal with tunable broadband frequency. The method comprises the following steps: constructing a stable dual-loop low-frequency optoelectronic oscillator; injecting an external continuous lights into the optoelectronic oscillator, implementing the injection locking in a directly modulated laser of a core component of the optoelectronic oscillator to finish the up-conversion process of the optical microwave so as to generate a high-frequency optical microwave signal; implementing the tunability of the optoelectronic oscillator by adjusting the wavelength, optical power and polarization state of the external continuous lights so as to generate the optical microwave signal with needed frequency. By injecting the external continuous lights into the directly modulated laser in the optoelectronic oscillator and then locking an optical carrier wave after the up-conversion is generated under a high-order mode, the high-quality optical microwave signal is produced. The method provided by the invention can be used for producing any high-frequency optical microwave signal based on an injection locking technology by using the lower-frequency electric signal, and the tunability of the microwave frequency can be realized by only controlling the wavelength, polarization state and optical power of the injected continuous lights.

An automatic engine shutdown apparatus for automatically shutting down an engine under a predetermined running or operating condition. The apparatus includes a vehicle speed sensor for detecting a vehicle speed, a throttle sensor for detecting a throttle opening, a travel history memory for storing a travel history of a vehicle, and an engine shutdown controller for automatically shutting down the engine depending on the vehicle speed, the throttle opening, and the travel history. The engine shutdown controller shuts down the engine after elapse of a standby time depending on the travel history since a predetermined engine shutdown condition has been satisfied. As a result, the automatic engine shutdown time is optimized depending on predetermined running or operating conditions of the vehicle.

A wireless mesh network comprising a plurality of mobile mesh devices coupled as nodes in a mesh network topology is provided herein. Generally speaking, each mobile mesh device may be a portable, self-contained unit, which does not require network or power wiring to communicate network traffic between the nodes. According to one embodiment, the mobile mesh device may include a small cell gateway for capturing, converting and re-routing cellular signals throughout and beyond the wireless mesh network. According to another embodiment, the mobile mesh device may include a real-time locating services (RTLS) hardware / software engine for capturing network traffic, identifying the identity and location of the device transmitting the network traffic, and triggering an action in response to either the identity and / or the location of the transmitting device. In some embodiments, the RTLS hardware / software engine may be combined with the small cell gateway to automatically re-route converted cellular signals throughout and beyond the wireless mesh network based on the identity of captured data packets.

A small antenna using an SRR structure in a wireless communication system includes: a first radiation unit positioned over a dielectric substrate formed of a predetermined dielectric medium and having a predetermined ring shape; a feed unit positioned over the dielectric substrate and configured to feed a signal to the first radiation unit; a second radiation unit positioned under the dielectric substrate and having a predetermined ring shape; a via formed through the dielectric substrate to connect the first and second radiation units; a ground unit positioned under the dielectric substrate and configured to ground the first and second radiation units; and a metal line unit positioned under the dielectric substrate to connect the second radiation unit and the ground unit. The feed unit includes first and second capacitors which accomplish impedance matching when the signal is fed to the first radiation unit.

An operational amplifier, a sub A / D converter, a D / A converter, and an operation amplifier in a first stage circuit operate in response to a clock signal. An operation amplifier, a sub A / D converter, a D / A converter, and an operation amplifier in a second stage circuit operate in response to a clock signal having a frequency three times as high as that of the first clock signal. An analog signal output from the operational amplifier in the first stage is applied to an input node in the second stage circuit through a switch. An analog signal output from an operational amplifier in the second stage circuit is applied to an input node in the second stage circuit through a switch.

An antenna device is provided with an antenna element including a base, an inductance adjustment pattern that is formed on the upper surface and a side surface of the base and has a substantially U-shape, a capacitance adjustment pattern that is formed on the upper surface of the base and is placed to face the inductance adjustment pattern, and first to third terminal electrodes provided on the bottom surface of the base. The antenna element is installed between the first side and the second side of the ground pattern that form the two facing sides of the antenna mounting region. One end of the inductance adjustment pattern is connected to the feed line, the other end of the inductance adjustment pattern is connected to the first side of the ground pattern, and the third terminal electrode is connected to the second side of the ground pattern.

An automatic engine shutdown apparatus for automatically shutting down an engine under a predetermined running or operating condition. The apparatus includes a vehicle speed sensor for detecting a vehicle speed, a throttle sensor for detecting a throttle opening, a travel history memory for storing a travel history of a vehicle, and an engine shutdown controller for automatically shutting down the engine depending on the vehicle speed, the throttle opening, and the travel history. The engine shutdown controller shuts down the engine after elapse of a standby time depending on the travel history since a predetermined engine shutdown condition has been satisfied. As a result, the automatic engine shutdown time is optimized depending on predetermined running or operating conditions of the vehicle.

A method of running a radio equipment, comprising providing a radio equipment having a structure of physically separate modules of a baseband modem and a radio frequency unit including radio frequency control means and radio frequency parts means; and providing a digital interface for the connection of the baseband modem module and the radio frequency unit module with each other within the radio equipment.

A wireless mesh network comprising a plurality of mobile mesh devices coupled as nodes in a mesh network topology is provided herein. Generally speaking, each mobile mesh device may be a portable, self-contained unit, which does not require network or power wiring to communicate network traffic between the nodes. According to one embodiment, the mobile mesh device may include a plurality of dipole antennas, which are enclosed within the mobile mesh device and configured to forward network traffic. At least one of the dipole antennas may be a frequency adjustable end-fed dipole antenna comprising a channel selection pin, which can be adjusted up or down along the dipole axis to change a resonant frequency of the dipole antenna. A method for setting or adjusting a resonant frequency of a frequency adjustable end-fed dipole antenna is also provided herein.

Disclosed is a method for tuning an antenna module in a portable wireless terminal and built-in antenna module using the same. According to the method and built-in antenna module, the built-in antenna module is provided with a plate type radiator defining a slot with a predetermined width to form a pattern. The plate type radiator is provided with downwardly protruded feed and ground pins that are spaced apart, and at least one passive element having a predetermined value is connected to the radiator to optimally tune the antenna module. Therefore, various frequency response properties of the built-in antenna module can be attained by altering such a passive element as a variable design parameter without changing the radiator. Also, this construction can take the place of a matching circuit in a signal line, such that radiation performance can be increased without insertion loss.

In an embodiment, an electroacoustic converter (earphone 100) has an enclosure 41, piezoelectric sounding body 32, electromagnetic sounding body 31, and passage 35. The piezoelectric sounding body 32 includes a vibration plate 321 having a periphery supported directly or indirectly on the enclosure 41, and a piezoelectric element 322 placed at least on one side of the vibration plate 321. The piezoelectric sounding body 32 divides the interior of the enclosure 41 into a first space S1 and a second space S2. The electromagnetic sounding body 31 is placed in the first space S1. A passage 35 is provided in or around the piezoelectric sounding body 32, to connect the first space S1 and second space S2. The electroacoustic converter is capable of obtaining desired frequency characteristics easily.

A waveguide filter comprises a dielectric board on at least one of the two E-planes of a rectangular waveguide. The dielectric board comprises a conductive pattern formed on one surface thereof and having a slit extending in a signal propagation direction, and a ground pattern formed on the other surface.

The invention discloses a pairing processing method, a first interphone, a second interphone and a pairing processing system and belongs to the field of wireless communication. The method comprises the following steps that the first interphone and the second interphone respond to a request for starting pairing, and the first interphone and the second interphone are switched to a broadcast frequency; the first interphone generates pairing information including a pairing identifier and a team-forming frequency; the first interphone sends the pairing information to the second interphone; the second interphone receives the pairing information, and if the pairing identifier is a target team-forming identifier, the second interphone is switched to the team-forming frequency; and the first interphone is switched to the team-forming frequency. Through frequency pairing of the first interphone and the second interphone, the problems of difficulty in operation, troublesome team-forming frequency modulation and too long time of frequency setting of a member are solved, so that the first interphone and the second interphone can be quickly switched to the same frequency to realize talkback, and the uniform frequency setting is quick, simple and easy to operate when a team utilizes the interphones.

A method for frequency- and time-selective interference suppression for a communication system based on OFDM, and a receiver therefor. To achieve a much lower bit error rate at the output of the receiver or to permit greater interference or a lower signal-to-noise ratio (in a prior art L-DACS1 receiver, at least 45 nautical miles) for the same transmission power, the invention provides: a filter bank pulse blanking method FBPB in which the sampled received signal is applied to a blanking unit for frequency-selective pulse blanking, which blanking unit consists of an analysis filter bank having M sub-bands; a module for frequency-selective pulse blanking of the sub-band signals; and a synthesis filter bank, which reassembles the signal. The analysis filter bank, which breaks down the received signal into multiple sub-bands on a frequency-selective basis, is used before OFDM windowing, such that the sub-band breakdown applies pulse blanking on a sub-band-selective basis.

In an embodiment, an electroacoustic converter (earphone 100) has an enclosure 41, piezoelectric sounding body 32, electromagnetic sounding body 31, and passage 35. The piezoelectric sounding body 32 includes a first vibration plate 321 having a periphery supported directly or indirectly on the enclosure 41, and a piezoelectric element 322 placed at least on one side of the vibration plate 321. The piezoelectric sounding body 32 has a second vibration plate and divides the interior of the enclosure 41 into a first space S1 and a second space S2. The electromagnetic sounding body 31 is placed in the first space S1. The passage 35 is provided in or around the piezoelectric sounding body 32 to connect the first space S1 and second space S2. The electroacoustic converter is capable of obtaining desired frequency characteristics easily.

A display device including a display control unit is provided. The display control unit is configured to display, in a display screen, a list image including a list of medical data that includes a part of a plurality of pieces of medical data of a patient having different time information. The display control unit is further configured to display a period image illustrating a total period from an oldest time to the present in time information of the medical data of the patient such that the total period fits in the display screen, wherein the display control unit is configured to display, in the period image, a partial period from an oldest time to a latest time of the time information of the medical data included on the displayed list of medical data.