32results about "Resonant circuit driving/adjusting means" patented technology

A method and apparatus for amplifying audio signals without exceeding an input current limit budgeted for the audio power amplifier circuit includes an intermediate energy storage between a battery and the audio power amplifier which provides an energy reserve to support amplifying peaks where the peaks have a peak power that is greater than the power that can be drawn from the battery due to the input current limit. Speech signals, which include substantial periodic content having short peaks relative to a pitch period, can be amplified without depleting the intermediate energy storage, allowing the intermediate energy storage to recover after a peak and before occurrence of a next peak. When an audio signal is amplified that results in depletion of the intermediate energy storage, a depletion recovery circuit reduces the overall audio gain to reduce the power demand of the audio power amplifier so as to substantially avoid distortion.

A RF-resonator (1) comprises a resonator body (2) with at least one resonant cavity (3). A conductive sheet material forms a surface area of the resonant cavity (3), the conductive sheet material being deformable by application of a mechanical force for tuning the resonator to a target frequency. A method for tuning the RF-resonator, comprising the following steps: measuring the resonance frequency of the resonant cavity (3), and deforming the conductive sheet material by applying an increasing mechanical force to the conductive sheet material until the target frequency of the resonant cavity (3) is reached.

An antenna tuning apparatus for a multiport antenna array used for sending and / or receiving electromagnetic waves for radio communication comprises: 4 antenna ports, 4 user ports, 10 adjustable impedance devices each presenting a negative reactance and having a terminal coupled to one of the antenna ports, 4 windings each having a first terminal coupled to one of the antenna ports and a second terminal coupled to one of the user ports, and 10 adjustable impedance devices each presenting a negative reactance and having a terminal coupled to one of the user ports. All adjustable impedance devices are adjustable by electrical means. Any small variation in the impedance matrix of the antenna array, caused by a change in operating frequency or a change in the medium surrounding the antennas, can be compensated with a new adjustment of the adjustable impedance devices.

Certain implementations of the disclosed technology may include systems and methods for high-frequency resonant gyroscopes. In an example implementation, a resonator gyroscope assembly is provided. The resonator gyroscope assembly can include a square resonator body suspended adjacent to a substrate, a ground electrode attached to a side of the resonator body, a piezoelectric layer attached to a side of the ground electrode, a drive electrode in electrical communication with the piezoelectric layer, and configured to stimulate one or more vibration modes of the square resonator body; and a sense electrode in electrical communication with the piezoelectric layer, and configured to receive an output from the square or disk resonator responsive to stimulation of the one or more vibration modes.

In a method and apparatus for operating a super-heterodyne receiver, a tuning circuit has a local oscillator for frequency shifting a desired channel to a selected frequency and a controller for controlling the local oscillator. The controller determines for each of a number of identified channels, whether an image signal is present at frequencies in the spectrum that when tuned to a first selected frequency interfere, and is operable to select a modified selected frequency at which interference between the image signal and the identified channel is reduced.

The invention relates to an electrical terminal module to which a large number of electrical conductors are connected and on which at least one predetermined function, in particular a timing function, can be executed. These functions can often be set, adjustable electrical components being arranged on a printed circuit board, which is arranged in the terminal module, for this reason. Since electrical terminal modules of this kind are required in ever narrower forms, it is necessary to create ways of being able to even arrange the adjustable electrical components in the housing too, but at the same time maintaining the ease with which the function can be set. The invention solves this problem by virtue of directly mounting the adjusting means on the printed circuit board which is installed in the housing.

A method for switch mode DC-AC converter driven oscillation system control, which can make the system always work on square wave driving, soft-switching and resonant conditions at the same time so that the system efficiency and power transfer ability can be greatly increased. The proposed method composes of four major techniques: (1) the technique to dynamically monitoring the innate system resonant frequency by detecting the phase difference between the system gate driving signal and the ZVC (Zero Voltage Crossing) or ZCC (Zero Current Crossing) signal of the main oscillation of the system;(2) the technique to realize a kind of Voltage Controlled Soft-switching Capacitor (VCSC); (3) the technique to avoid frequency bifurcation problem of variable frequency systems and (4) the technique toadjust the output pulse width of mono-stable flip flops (or multivabritors) dynamically with a DC voltage.

An implantable device including a proximal end, a distal end, an elongate electrically conductive component arranged between the proximal end and the distal end, and a contact pole electrically connected to the elongate electrically conductive component. The contact pole is arranged in a region of the distal end to electrically contact bodily tissue adjacent to the contact pole during operation of the implantable device. The elongate electrically conductive component includes a sub-component connected in series with remaining portions of the elongate electrically conductive component. The sub-component includes a capacitive component, an inductive component and a magneto-resistive component, which are arranged to cause a reduction of a resistivity of the magneto-resistive component that leads to a shift of a resonance frequency of the sub-component.