78 results about "Electronic tuning" patented technology

An electronically tuned, absorptive, low-loss notch filter with high RF power handling capability is obtained using a four-port quadrature hybrid coupler connected to a matched pair of band pass resonator devices and resistive terminations. The notch filter design uses series-only tuning elements for the band pass resonator devices to raise the RF power handling of the band pass resonators far above conventional techniques while also being tunable at high speeds. The notch filter architecture and method can be used for interference cancellation in a wide range of wireless technologies, such as cellular phone, wireless routers, hand-held radios, satellite communications, and any other environments where there are a number of wireless technologies in close signal proximity.

A fiber laser cavity that includes a laser gain medium for receiving an optical input projection from a laser pump. The fiber laser cavity further includes a positive dispersion fiber segment and a negative dispersion fiber segment for generating a net negative dispersion for balancing a self-phase modulation (SPM) and a dispersion induced pulse broadening / compression in the fiber laser cavity for generating an output laser with a transform-limited pulse shape. The fiber laser cavity further includes a polarization controller controlled and driven by an electronically tunable driver tapping a small portion of an output laser of the fiber laser cavity to process and filtering the small portion of the output laser to drive the polarization controller to adjust a polarization state of a laser transmission in the laser system whereby the laser cavity is an electronically-tuned self-starting polarization-shaping mode-locked fiber laser.

There is disclosed a piezoelectric droplet maker that is driven at high frequency and energized with high power and high frequency Operational Amplifier (OP-AMP) electronics. The droplet maker implements a method of producing jets of uniform droplets of solution precursors (or any other homogeneous liquids). The formation of droplets results from stream break up due to the disturbance of liquid jets by the piezo actuator as they leave an orifice. This disturbance can be electronically tuned to produce uniform droplets with high repeatability. In another aspect, the droplet maker can be used to inject axially uniform diameter solution precursor droplets into process gas flow of a microwave plasma apparatus.

The invention provides a transcranial Doppler plane annular phased array probe, which comprises a piezoelectric vibrator, a metal shielding casing, an electronic tuning circuit, a coaxial cable, a case, a back lining, a matching layer and an acoustic lens, wherein the piezoelectric vibrator comprises more than one array element ring in annular distribution to form concentric circles, each array element ring adopts independent lead wire control, the areas of all array elements are identical, in addition, the path differences of all array elements are identical, each independent array element is excited by adopting specific time delay, and the dynamic focusing in the spreading direction of ultrasonic beams can be achieved. The plane annular phased array is utilized, each array element is respectively subjected to time delay during the emitting or receiving, and the emitting focusing or the receiving focusing is realized, so focal points can be continuously adjusted, the ultrasonic beams can be effectively and controllably narrowed, the depth of field is long, the transcranial Doppler plane annular phased array probe has the advantages of variable aperture, variable focal point, variable trace and the like, the lateral resolution ratio of a system can be comprehensively improved, and the signal to noise ratio is effectively improved.

A wrist mounted electronic tuning device for use in tuning an acoustic musical instrument which includes a self-adapting wristband to automatically accommodate to a wide range of wrist sizes. Additionally, the tuning device includes sensing means operable for sensing an acoustic musical tone produced by the musical instrument and producing a representative electrical signal, conditioning means operable for amplifying, pre-filtering, and shaping the electrical signal into a representative pulse train, input means for selecting a musical note to tune to, computing means for receiving the pulse train and selected musical note and utilizing pre-programmed algorithms to determine the instrument's tuning condition, an output means to annunciate the tuning condition, and a power level switching means to permit the tuner to function in either a fully powered signal acquisition state or low power sleep state.

Methods for assisting a technician in tuning a musical instrument exhibiting inharmonicity, such as a piano. If one aspect, a plurality of target frequencies are calculated using a table of preferred stretch values. In another aspect, target frequencies are calculated from multiple inharmonicity measurements during the time a tone generator is sounding.

In order to permit electronic tuning of the frequency of a circuit including dielectric resonators, such as a dielectric resonator filter, tuning plates are employed adjacent the individual dielectric resonators. The tuning plates comprises two separate conductive portions and an electronically tunable element electrically coupled therebetween. The electronically tunable element can be any electronic component that will permit changing the capacitance between the two separate conductive portions of the tuning plates by altering the current or voltage supplied to the electronically tunable element. Such components include virtually any two or three terminal semiconductor device. However, preferable devices include varactor diodes and PIN diodes.

A power amplifier apparatus that includes a main power amplifier circuit and an injection power amplifier circuit is provided. The main amplifier includes a pair of quadrature coupled amplifiers. Similarly, the injection power amplifier also includes pair of quadrature coupled amplifiers. The output signal from the injection amplifier is connected to the isolation port of the quadrature coupler of the main amplifier. The input signal is split and applied to the inputs of both the main and injection amplifiers. The gain and phase through the injection amplifier is adjusted in order to vary the magnitude and phase of the signal injected into the isolation port of the quadrature combiner of the main amplifier. By varying the magnitude and phase of the injected signal, the impedance seen by the individual amplifiers within main amplifier can be controlled. Controlling these impedances allows the properties of the main amplifier to be dynamically varied.

This invention provides a novel electronically tunable active duplexer for wireless transceiver applications. It relates to an active duplexer with full-duplex operation, permitting simultaneous transmission and reception of signals at same or different frequencies. It incorporates varactors, instead of fixed or mechanically adjustable capacitors, in phase shifting networks enabling one to electronically tune, with ease and precision, the frequency at which isolation is desired, over a band in both transmit and receive modes of operations. It can be implemented as a Monolithic Microwave Integrated Circuit (MMIC).

A display interface for an electronic tuner for tuning a musical instrument includes a plurality of spaced apart, separately illuminatable, light emitting diodes (LEDs) situated in a continuous circular array. A cylindrically-shaped light pipe is situated in proximity to the circular array of LEDs. The light pipe has radially extending slits formed therein to define individually illuminatable segments. Each segment of the light pipe is illuminatable by a respective light emitting device. A disc-shaped note dial is situated in proximity to the light pipe and has illuminatable indicia on a surface thereof corresponding to musical notes. The indicia is illuminatable by the light pipe for viewing by a user of the electronic tuner.

The invention relates to a mobile phone, and a method and a device for dynamically tuning a television internal antenna thereof. The method for dynamically tuning the television internal antenna of the mobile phone comprises the following steps that: a mobile phone baseband circuit receives a frequency band selection signal and a frequency channel selection signal, controls a television receiving chip to be tuned to the selected frequency band and frequency channel, connects the internal antenna to a corresponding tuning network of a plurality of tuning networks in an electronic tuning circuit through the frequency band selection switch based on the selected frequency band so as to set the electronic tuning circuit in the selected frequency band, and regulates the electronic tuning circuit based on the selected frequency channel to make the electronic tuning circuit reach the tuning point of the selected frequency channel. In the invention, an optimal receiving frequency point can be dynamically changed to be synchronous with a television channel to be watched so as to realize the dynamical tuning matching with an optimal sensitivity and improve the receiving sensitivity of an antenna system. Moreover, the invention has the advantages of stable performance, low cost and small volume.

There is disclosed a piezoelectric droplet maker that is driven at high frequency and energized with high power and high frequency Operational Amplifier (OP-AMP) electronics. The droplet maker implements a method of producing jets of uniform droplets of solution precursors (or any other homogeneous liquids). The formation of droplets results from stream break up due to the disturbance of liquid jets by the piezo actuator as they leave an orifice. This disturbance can be electronically tuned to produce uniform droplets with high repeatability. In another aspect, the droplet maker can be used to inject axially uniform diameter solution precursor droplets into process gas flow of a microwave plasma apparatus.

The invention discloses a power line information monitoring method and monitoring device. The method includes the following steps that a, when transmitted in an electric power communication line, power line carrier communication information is received, and electronic tuning processing and A / D conversion are carried out on the power line carrier communication information; b, smoothing and digital frequency conversion processing are carried out on digital signals after A / D conversion; c, modeling is conducted on processed signals to restore digital baseband signals, relevant characteristics of the digital baseband signals are extracted, and whether communication behaviors exist in the electric power communication line or not is judged according to the extracted relevant characteristics. According to the method and device, information processing equipment can be monitored, the information can be transmitted through a power line, abnormal communication can be timely found out, and the situation that the equipment is attacked by pre-buried information combs due to password divulging or loss of important information is prevented.

The invention provides a friction electronics tuning diode and a modulator circuit applying the friction electronics tuning diode. The friction electronics tuning diode comprises a friction nanometer electric generator, an impedance element and a PN junction element; the first end of the PN junction element is connected to the first output end of the friction nanometer electric generator, and the second end of the PN junction element is connected to the second output end of the friction nanometer electric generator through the impedance element, wherein the first end of the PN junction element is further connected to the first output end of the friction electronics tuning diode, the second end of the PN junction element is connected to the second output end of the friction electronics tuning diode, and the junction capacitance of the PN junction element is regulated and controlled by an adjustable electrostatic potential generated by the friction nanometer electric generator under the effect of external force. Active modulation of the friction nanometer electric generator for PN junction equivalent capacitance is realized, and active human-machine interaction modulation for analog signals is realized, so that the preparation technology is simple, the material selection is wide, and the cost is relatively low.

The invention relates to a tunable laser for outputting non-polarized light. The tunable laser is mainly and technically characterized by comprising a first reflection mirror, a broadband laser gain medium, a tunable Fabry-Perot filter, a tunable acousto-optic filter, a second reflection mirror, a third reflection mirror and a laser control circuit, wherein a broadband light beam sent from the broadband laser gain medium can be filtered by the tunable Fabry-Perot filter and then is filtered by the tunable acousto-optic filter; a first-grade diffraction light beam is divided into two beams of polarized light with vertical polarized states; and a zero-grade diffraction light beam of the tunable acousto-optic filter is taken as an output light beam of the laser device. According to the tunable laser disclosed by the invention, continuous, the continuous, rapid and precise tuning can be performed on the output light of the laser in a wide spectral range; and the tunable laser has the characteristics of absence of mechanical movement parts, high electronic tuning speed, stable and reliable performance, small size, easiness in production and the like, and can be widely applied to the fields of lasers, optical tests, optical fiber communication, biological and medical instruments, optical fiber sensor networks and the like.

The present invention is an energy harvester having a mechanical natural frequency that can be mechanically tuned to the natural frequency of the vibrating environment without having to add or subtract mass to seismic / proof mass, change the mass of the mechanical spring or change the physical dimensions of the mechanical spring of the energy harvester. In another embodiment, the electromagnetic natural frequency of the energy harvester is electronically tuned by adding a tuning circuit comprising a variable dissipative element without changing the mechanical natural resonant frequencies of the energy harvester.

An apparatus and method for an electronically tuned, wavelength-dependent optical detector are disclosed. The electronically tuned, wavelength-dependent optical detector is a modified metal-semiconductor-metal photodetector comprising a comb-like metal electrode at a common voltage and metal electrodes each supplied with a control voltage by a voltage means. The wavelength to be detected in a stream of light illuminating the electronically tuned, wavelength-dependent optical detector is selected based on the set of control voltages applied to the metal electrodes using the voltage means and the relative position of the electronically tuned, wavelength-dependent optical detector. In another embodiment of the invention, the wavelength to be detected with the electronically tuned, wavelength-dependent optical detector is also selected using a standing wave generator, such as an interferometer, to produce a spatially varying light intensity on the surface of the electronically tuned, wavelength-dependent optical detector.

Adjustment work for a radio tuner system IC is reduced. A radio tuner part 30 into which is built a register 54, and an electronic tuning control part 32 into which is built a nonvolatile memory 62 for storing an operation parameter preset in the register 54, are constructed to form a single tuner system IC 20. This structure enables data for the radio tuner part 30 of the same package to be written to the nonvolatile memory 62 at a step for manufacturing the tuner system IC 20. The work of adjusting the nonvolatile memory 62 is performed in conjunction with a finished goods inspection performed after packaging of the tuner system IC. High-speed semiconductor testers are generally used to perform such inspections, and the work of adjusting the nonvolatile memory 62 can also be performed at high speed.

The invention discloses a sealing and positioning wax for an electronic tuner and a preparation method thereof. The sealing and positioning wax is prepared by mixing petroleum wax, polyethylene wax, paste hydrocarbon, and a butylene polymer according to specific proportion and processing. The sealing and positioning wax has the characteristics of high insulativity, moisture resistance, mobility, sealing performance, heat resistance, and cold resistance, appropriate physical and chemical property and using performance, non-toxicity, environmental-friendliness and the like. The sealing and positioning wax is suitable for sealing and positioning the electronic tuner.

Demodulator includes reception quality evaluation circuit for evaluating the quality of a received signal by comparison with a first reference value, and outputting an evaluation signal; and driving circuit receiving the evaluation signal. If reception quality evaluation circuit evaluates that the quality of the received signal is acceptable, power supply from driving circuit to DC offset control loop is stopped. This offers a high-frequency receiver that reduces power consumption.

A tuning device includes a weighted housing which reduces transfer of vibrations of all strings of a stringed musical instrument to a body of the stringed musical instrument, and tuning circuitry which simultaneously detects a pitch of each vibrating string. A method of tuning a stringed musical instrument includes attaching an electronic tuning device to a bridge of the stringed musical instrument, activating the electronic tuning device, causing a plurality of strings of the stringed musical instrument to vibrate simultaneously, and individually adjusting a pitch of each of the simultaneously vibrating strings in accordance with a pitch indication for each of the strings produced by the electronic tuning device.

A predistorter linearizer includes a magnitude distorter and a phase distorter, each including variability to provide a desired magnitude characteristic and phase characteristic. The method comprises adjusting a circuit to provide a desired magnitude characteristic and adjusting the circuit to provide a desired phase characteristic. A signal is modified using the desired magnitude and phase characteristics to produce a signal for amplification. The modification of the signal is offset by any modification resulting from the amplification, resulting in a more linearized amplifier output.

The invention provides a method for automatically realizing the tuning of an electronic tuning radio, which relates to the field of a broadcast technology and a computer software application technology. The method for automatically realizing the tuning of the electronic tuning radio mainly utilizes an established test module to carry out automatic test, interpolation operation and fine tuning on an ANT_vtune ATBACK list and an AMP_vtune ATBACK list, so that an antenna tuning loop calibrates r frequency points on some wave band L point by point, obtains accurate Vtune value, and stores the accurate Vtune value into the ANT_vtune ATBACK list, and a high-frequency amplifying tuning loop also calibrates the r frequency points on some wave band L point by point and adjusts the AMP_vtune ATBACKlist in time. The optimal resonance capacitance values of all the frequency points of the radio can be automatically calculated by assessing noise level, so that the optimal tuning of all the frequency points can rapidly and accurately be realized. The invention solves the problem that the optimal tuning can not be carried out on all the frequency points one by one during the production of the electronic tuning radio, overcomes the disadvantages of the long time period and the cumbersome process of manually tuning a sample machine one by one, and reduces the production complexity.

In order to permit electronic tuning of the frequency of a circuit including dielectric resonators, such as a dielectric resonator filter, tuning plates are employed adjacent the individual dielectric resonators. The tuning plates comprises two separate conductive portions and an electronically tunable element electrically coupled therebetween. The electronically tunable element can be any electronic component that will permit changing the capacitance between the two separate conductive portions of the tuning plates by altering the current or voltage supplied to the electronically tunable element. Such components include virtually any two or three terminal semiconductor device. However, preferable devices include varactor diodes and PIN diodes.

A system is described for maintaining an inductive-capacitive (LC) network at resonance while the excitation frequency may be varied between a number of discrete frequencies at desired instants controlled by a modulation input, while taking into account component parameter errors due environmental and ageing as well as manufacturing tolerances. Control of the resonance while the excitation frequency changes permits the transmission of frequency modulation (FM) or frequency shift keying (FSK) information through an inductively coupled power transfer system.

An electronic tuner has an input terminal, a mixer receiving the signal fed into the input terminal, a matching circuit connected to an output of the mixer, a band-pass filter connected to an output of this matching circuit, an intermediate-frequency (IF) amplifier connected to an output of the band-pass filter, and an output terminal receiving output of the IF amplifier. These circuits are composed of balanced circuits and connected by balanced lines. The mixer has a high output impedance. For the matching circuit, the impedance of the matching circuit at the band-pass filter side is equal to the impedance of the band-pass filter at the matching circuit side. This structure can realize an electronic tuner having low power consumption.

An RF electronic impedance tuner uses multiple PIN diodes, Varactors or MOSFETs, mounted in a low loss slab-line, between the bottom surface of the center conductor and ground, are DC controlled individually and spaced appropriately along the slab-line in order to generate maximum Gamma and bandwidth. The electronic tuner is combined with a slide screw tuner, using the same slab-line in various configurations, before, after or sharing the same slab-line section, mounted on top of each-other. Calibration on a VNA allows high Gamma and harmonic tuning.