78 results about "Electronic tuning" patented technology

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.

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).

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.

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.

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.

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.