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95results about "Automatic frequency control" patented technology
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Broadband integrated tuner
InactiveUS7079195B1Low costImprove manufacturabilityTelevision system detailsColor television detailsFrequency mixerDown conversion mixer
A broadband integrated receiver for receiving input signals and outputting composite video and audio signals is disclosed. The receiver employs an up-conversion mixer and a down-conversion mixer in series to produce an intermediate signal. An intermediate filter between the mixers performs coarse channel selection. The down-conversion mixer may be an image rejection mixer to provide additional filtering.
Owner:CSR TECH INC
High-frequency switch
A high-frequency switch includes a transmission terminal, an antenna terminal, a reception terminal, and a voltage-control terminal; a first diode, the cathode thereof being electrically connected to the transmission terminal, and the anode being electrically connected to the antenna terminal; a first transmission line, electrically connected between the antenna terminal and the reception terminal; a second diode, the cathode thereof being electrically connected to the reception terminal, and the anode being electrically connected to the voltage-control terminal; a second transmission line, one end thereof being electrically connected to the transmission terminal, and the other end being connected to ground; and a capacitor, electrically connected between the voltage-control terminal and ground. The above high-frequency switch can be miniaturized and has superior performance.< / PTEXT>
Owner:MURATA MFG CO LTD
Frequency phase correction system
InactiveUS20050162306A1Effective sensitivity is improvedLow signal levelPosition fixationAngle demodulation by phase difference detectionPhase correctionRadio frequency signal
A frequency phase correction system and method are described that provides a receiver with a greater ability to lock onto relatively weak radio frequency signals by determining and estimating an amount of frequency error in a local frequency reference of the receiver, and using the error estimate to maintain frequency coherence with a received signal, thereby allowing tracking over a longer period of time, enabling longer integration times to capture weaker signals without losing frequency coherence.
Owner:CSR TECH INC
Bicycle management column and charging method for electric bicycle rental system
InactiveCN101571974AApparatus for meter-controlled dispensingAutomatic frequency controlEngineeringCard reader
The invention discloses a bicycle management column and a charging method for an electric bicycle rental system, wherein the bicycle management column comprises a shell, a lockset, a card reader, a rental processing module, a bicycle identification module, a charging module and a stopper; and the method comprises the following steps that: a user parks an electric bicycle in place first, the stopper sends an in-place signal, the bicycle identification module identifies the bicycle identity, the rental processing module performs bicycle-returning processing, the lockset locks the electric bicycle and then the charging module charges the electric bicycle automatically, and charge-completion information is displayed when the charging is completed. By applying the bicycle management column and the charging method; after the user returns the electric bicycle, the bicycle management column charges the returned electric bicycle automatically. Thus, the problem that the returned electric bicycle cannot be charged automatically when the electric bicycle rental is in operation is solved.
Owner:童国林 +1
Timing synchronization circuit for wireless communication apparatus
ActiveUS20160041579A1Pulse automatic controlGenerating/distributing signalsData transmissionComputer science
A transmission node includes a digital front-end device that provides functional clocks for JESD204B based data transmission. The front-end device includes a PLL for generating a phase locked clock based on a device clock of the front-end device, a clock dividing unit for generating the functional clocks by dividing the phase locked clock, a clock gating unit connected between the PLL and the clock dividing unit, and a system reference signal sampling unit for timing radio frame boundaries. The clock gating unit gates the phase locked clock to align the functional clocks with the device clock within a predetermined number of cycles of the phase locked clock, upon locking of the PLL or receipt of a system resynchronization request. The system reference signal sampling unit samples the system reference signal with zero-cycle latency between device clock and phase locked clock.
Owner:NXP USA INC
Fractional-N based digital AFC system with a translational PLL transmitter
ActiveUS7626462B1Pulse automatic controlAutomatic frequency controlLocal oscillator signalRadio frequency signal
A fractional-N based Automatic Frequency Control (AFC) system for a mobile terminal is provided. In general, automatic frequency control is implemented in a frequency synthesizer to correct or compensate for a frequency error of an associated reference oscillator. The frequency synthesizer includes a first fractional-N phase-locked loop (FN-PLL) generating a baseband clock signal used by a baseband processor of the mobile terminal, a second FN-PLL generating a receiver local oscillator signal used by a receiver of the mobile terminal to downconvert a received radio frequency signal to a desired frequency, and a translational PLL generating a transmitter local oscillator signal used by a transmitter of the mobile terminal to provide a radio frequency transmit signal. The automatic frequency control is performed by applying a digital correction value, which is preferably multiplicative, to fractional-N dividers of the first and second FN-PLLs.
Owner:QORVO US INC
Systems and Methods for Tuning Filters
InactiveUS7482890B2Reduce sensitivityError in sensitivityTransmission control/equlisationAutomatic frequency controlFir filter designFilter tuning
Owner:SUPERCONDUCTOR TECHNOLOGIES INC
Method and apparatus for crystal drift compensation
InactiveUS20050195917A1Reduce noiseReduce circuit costPulse automatic controlGenerator stabilizationFrequency stabilizationFrequency synthesizer
A mobile device includes frequency synthesizer circuitry for generating a channel frequency at a multiple of a reference frequency. The reference frequency is generated by a free-running crystal oscillator, without frequency stabilization circuitry. Variations in the output of the crystal oscillator are compensated by adjusting the multiplication factor of the frequency synthesizer.
Owner:TEXAS INSTR INC
Spectrum analyzer and method for correcting frequency errors
ActiveUS20070026830A1Compensating for such errorSpectral/fourier analysisPulse automatic controlSignal correctionSpectrum analyzer
A spectrum analyzer corrects for internal frequency errors in a reference oscillator using a timing control signal. The reference oscillator provides a reference signal at a reference frequency. An error detection circuit determines an error in the reference frequency using the timing control signal and produces an error correction signal for use by a frequency conversion device in adjusting an output frequency thereof to compensate for the frequency error in the reference frequency.
Owner:KEYSIGHT TECH
Apparatus and method for generating vibration based on sound characteristics
ActiveUS20130163785A1Signal processingPiezoelectric/electrostrictive gramophone pickupsDistribution characteristicEngineering
A method and apparatus for generating vibration based on sound characteristics in a mobile terminal are provided. The method includes converting audio data into an audio signal upon generation of a sound play request; determining whether to generate vibration based on a sound volume of the audio signal; setting an actuator to be driven for the audio signal among at least two actuators based on frequency distribution characteristics of the audio signal if it is determined upon determining to generate the vibration; and driving the actuator being set for the audio signal when outputting the audio signal.
Owner:SAMSUNG ELECTRONICS CO LTD
Method and arrangement for reducing frequency offset in a radio receiver
InactiveUS6956895B2Reduce noiseFrequency errorAutomatic frequency controlTransmission noise suppressionRadio receiver designFrequency compensation
The invention concerns generally the technology of reducing frequency offset in a radio receiver. Especially the invention concerns receivers where a channel estimator is used for correcting the base band signal. The objects of the invention are achieved by monitoring the phase of the channel estimation output and generating a complex phasor on the basis of successive phase values. The received baseband signal is then multiplied by the generated complex phasor for compensating the frequency offset. The frequency compensation can be made before or after said channel estimation thus producing a feedback compensation or feed forward compensation. The feedback compensation can be implemented by compensating the baseband signal either prior to the despreading or after the despreading.
Owner:NOKIA TECHNOLOGLES OY
Mobile radio communication system, mobile communication device, and frequency control method thereof
InactiveUS20110217934A1Synchronisation arrangementBaseband system detailsInformation processingLocal oscillator signal
A mobile communication device and a frequency control method for the device are provided that can have an internal reference frequency follow a change in reception frequency even when the reception frequency changes abruptly. In a mobile radio communication system including a mobile station and a stationary base station, the mobile station includes: a transceiver that receives a high-frequency signal from the base station; and an information processing section that predicts a frequency change in the reception high-frequency signal received from the base station based on mobile environment information on the mobile station provided from outside and controls a frequency of a local oscillator signal of the transceiver section based on a prediction result.
Owner:LENOVO INNOVATIONS LTD HONG KONG
Transmitter, receiver, and transmission/reception system
InactiveUS20070206661A1Small sizeLittle powerSurgeryEndoscopesVoltage converterAudio power amplifier
A transmission / reception system includes a transmitter and a receiver. The transmitter includes a voltage converter for generating a voltage according to transmission data, a voltage-controlled oscillator for generating a signal of a frequency corresponding to the voltage generated by the voltage converter under non-feedback control, and a first antenna for emitting the signal generated by the voltage-controlled oscillator. The receiver includes a second antenna for receiving the signal emitted from the first antenna, a first amplifier for amplifying the signal received by the second antenna, an oscillator for generating a local oscillation signal, a mixer for mixing the signal amplified by the first amplifier with the local oscillation signal and converting the signal amplified by the first amplifier into an intermediate-frequency (IF) signal, a detector for detecting the IF signal, and a controller for changing a frequency of the local oscillation signal according to the frequency of the received signal, so that the IF signal has a predetermined frequency.
Owner:PANASONIC CORP
Dynamic biasing of a vco in a phase-locked loop
InactiveUS20090111409A1Pulse automatic controlGenerator stabilizationSignal-to-noise ratio (imaging)Control signal
A local oscillator includes a phase-locked loop. The phase-locked loop includes voltage controlled oscillator (VCO) and a novel VCO control circuit. The VCO control circuit may be programmable and configurable. In one example, an instruction is received onto the VCO control circuit to change the power state of the VCO. The instruction is issued by other circuitry in response to a detected change in RF channel conditions (for example, a change in a signal-to-noise determination) in a cellular telephone. In response, the VCO control circuit outputs control signals that gradually widen the loop bandwidth of the PLL, then gradually change the VCO bias current to change the VCO power state, and then narrow the loop bandwidth of the PLL back to its original bandwidth. The entire process of widening the PLL bandwidth, changing the VCO power state, and narrowing the PLL bandwidth occurs while the PLL remains locked.
Owner:QUALCOMM INC
Reference oscillator frequency correction system
InactiveCN101084451AImprove noise characteristicsIncrease effective sensitivityGenerator stabilizationPosition fixationRadio frequency signalWeak signal
A receiver reference oscillator frequency correction system and method are described that provides a receiver with a greater ability to lock onto relatively weak radio frequency signals by determining and estimating an amount of frequency error in a local frequency reference of the receiver, and using the error estimate to maintain frequency coherence with a received signal, thereby allowing tracking over a longer period of time, enabling longer integration times to capture weaker signals without losing frequency coherence.
Owner:SIRF TECHONOLOGY INC
Method for dynamically tuning the clock frequency of an oscillator and corresponding oscillating system
ActiveUS7622997B2Minimize and reduce errorPulse automatic controlGenerator stabilizationClock rateEngineering
An oscillator system may include an oscillator block having a plurality of inputs and outputting a clock signal, a frequency divider block receiving the clock signal and outputting a divided clock signal, a tuning block receiving the divided clock signal and outputting a comparison signal, and a control block coupled to the tuning block. The control block may receive the comparison signal. The control block may include a configuration block for producing a plurality of outputs for the corresponding inputs of the oscillator block, and an Up / Down counter having outputs applied to the configuration block.
Owner:STMICROELECTRONICS SRL
Wireless communication system and method
InactiveCN101388720AImprove reception characteristicsCarrier regulationFrequency-modulated carrier systemsInformation transmissionCommunications system
Owner:NEC CORP
Synchronization scheme with adaptive reference frequency correction
ActiveUS20110248754A1Improved synchronization schemeImprove methodSynchronisation arrangementPulse automatic controlCouplingControl signal
An apparatus and a method provide synchronization of an output signal to a synchronization information. The synchronization is accomplished by providing coupling of a correction control information that controls a signal generator, e.g. a phase locked loop arrangement or a direct digital synthesis arrangement, to its exact frequency to a frequency conversion unit that converts an uncorrected reference frequency to a correct or exact reference frequency. Thereby, the uncorrected reference frequency for the signal generator can be provided by a simple crystal oscillator without any frequency controller. The setting of the signal generator and the frequency conversion unit can be done in a predetermined sequence which enables a user equipment to synchronize its reference frequency to the synchronization information emitted by a communication network.
Owner:SNAPTRACK
Frequency phase correction system
InactiveUS7929928B2High sensitivityLong integrationPosition fixationAngle demodulation by phase difference detectionPhase correctionTime segment
A frequency phase correction system and method are described that provides a receiver with a greater ability to lock onto relatively weak radio frequency signals by determining and estimating an amount of frequency error in a local frequency reference of the receiver, and using the error estimate to maintain frequency coherence with a received signal, thereby allowing tracking over a longer period of time, enabling longer integration times to capture weaker signals without losing frequency coherence.
Owner:CSR TECH INC
Oscillators having arbitrary frequencies and related systems and methods
ActiveUS8228127B2Pulse automatic controlModulated-carrier systemsElectrical and Electronics engineeringEngineering
Systems and methods for operating with oscillators configured to produce an oscillating signal having an arbitrary frequency are described. The frequency of the oscillating signal may be shifted to remove its arbitrary nature by application of multiple tuning signals or values to the oscillator. Alternatively, the arbitrary frequency may be accommodated by adjusting operation one or more components of a circuit receiving the oscillating signal.
Owner:ANALOG DEVICES INC
Oscillators having arbitrary frequencies and related systems and methods
ActiveUS20120139647A1Adjustment of settingPulse automatic controlOscillations generatorsElectrical and Electronics engineering
Systems and methods for operating with oscillators configured to produce an oscillating signal having an arbitrary frequency are described. The frequency of the oscillating signal may be shifted to remove its arbitrary nature by application of multiple tuning signals or values to the oscillator. Alternatively, the arbitrary frequency may be accommodated by adjusting operation one or more components of a circuit receiving the oscillating signal.
Owner:ANALOG DEVICES INC
Tuning circuit
InactiveUS7463085B2Maximize the effectMultiple-port networksContinuous tuning detailsCapacitanceEngineering
The present invention relates to a filter and, more particularly, to a tuning circuit of a filter for correcting a cut-off frequency of the filter. The tuning circuit comprises a current generation unit having a first transistor and a variable resistor unit, and a capacitance correction unit having a second transistor, a capacitor unit, an up-down counter and a selection unit for selecting a control path of the up-down counter for varying the resistance or capacitance.
Owner:INTEGRANT TECH
Automatic frequency control loop circuit
InactiveUS20070025491A1Decreases count valuePulse automatic controlAmplitude-modulated carrier systemsFrequency synthesizerEngineering
Provided is a frequency control loop circuit changing division ratios of a frequency synthesizer to oscillate frequencies in a broadband with high precision. The circuit comprises a clock oscillator, a frequency synthesizer, and a demodulator.
Owner:INTEGRANT TECH
Device and method for adjusting loop filter gain in automatic frequency controller
InactiveUS8706051B2Improve performanceResonant long antennasPulse automatic controlLoop filterEngineering
Provided is a device and a method for adjusting a loop filter gain in an automatic frequency controller, which can allow the automatic frequency controller to operate while maintaining an optimal performance. The device includes a velocity estimator for estimating a change in velocity in accordance with a movement of a terminal; a loop filter gain controller for controlling a loop filter gain in accordance with a change in velocity received from the velocity estimator; and a loop filter gain unit for multiplying a loop filter gain received from the loop filter gain controller and a frequency error for output. Further, there is provided a method for adjusting a loop filter gain in an automatic frequency controller, having the steps of: estimating a change in velocity in accordance with a movement of a terminal; adjusting a loop filter gain in accordance with the estimated change in velocity; and multiplying the adjusted loop filter value and a frequency error for output.
Owner:SAMSUNG ELECTRONICS CO LTD
Method and Apparatus for Automatic Frequency Correction in a Multimode Device
ActiveUS20090227248A1Synchronisation arrangementTime-division multiplexRadio access technologyComputer science
A method and apparatus for synchronizing a system clock with a serving cell (102) associated with a first radio access technology and monitoring an adjacent cell (104) associated with a second radio access technology is provided. A communication device (100) includes a first synchronization device (205) capable of synchronization with the serving cell (102) and a second synchronization device (206) capable of independently synchronizing with the adjacent cell (104). The first synchronization device (205) and second synchronization device (206) include independent frequency correction modules (207,208). Thus, the second frequency synchronization device (206) may be corrected per the adjacent cell (104) while the first synchronization device (205) remains synchronized with the serving cell (102). Thus, the same corrected system clock may be used between two radio access technologies.
Owner:GOOGLE TECH HLDG LLC
Intelligent-tracking tunable band-pass filtering device
InactiveCN101610076AConducive to simplificationSimple design principleAutomatic frequency controlFrequency selective two-port networksBandpass filteringImpedance matching
The invention belongs to the technical field of signal filtering and provides an intelligent-tracking tunable band-pass filtering device which consists of a central processing unit, first, second, third and fourth DA converters, an RAM, an external data interruption and high-pass filter, a first band-stop resonance filter, a second band-stop resonance filter, a low-pass filter, an n-shaped resistance impedance matching device, as well as a first and a second single-chip integrated radio-frequency amplifier. The intelligent-tracking tunable band-pass filtering device adopts the high-pass filter with unchanged cut-off frequency to inhibit static stray signals (wherein the frequency and the power are unchanged), and adopts two band-stop resonance filters with changeable resonance frequency and one intelligent-tracking low-pass filter to constitute an intelligent-tracking filtering device which has changeable central frequency and changeable relative bandwidth to inhibit the static stray signals.
Owner:THE 41ST INST OF CHINA ELECTRONICS TECH GRP
Variable tuning circuit using variable capacitance diode and television tuner
InactiveUS20080129428A1Increase rangeIncrease valueTelevision system detailsContinuous tuning detailsLow frequency bandEngineering
The invention provides a variable tuning circuit capable of extending a variable range in a high frequency band, ensuring the value of L of an inductor to increase the value of Q of a circuit in a low frequency band, and preventing a reduction in gain, an increase in noise, and unstable oscillation.A variable tuning circuit includes: a first parallel resonance circuit that includes a varactor diode, a capacitor connected in series to the varactor diode, and a first inductor connected in parallel to the varactor diode and the capacitor; and a second parallel resonance circuit that includes a second inductor connected in parallel to the varactor diode with a direct current cut-off capacitor interposed therebetween. When the varactor diode has a maximum capacitance, a resonant frequency of the second parallel resonance circuit is set about a lowest frequency in a variable frequency range.
Owner:ALPS ALPINE CO LTD
Device and method for adjusting loop filter gain in automatic frequency controller
InactiveUS20070200639A1Improve performancePulse automatic controlAutomatic frequency controlLoop filterEngineering
Provided is a device and a method for adjusting a loop filter gain in an automatic frequency controller, which can allow the automatic frequency controller to operate while maintaining an optimal performance. The device includes a velocity estimator for estimating a change in velocity in accordance with a movement of a terminal; a loop filter gain controller for controlling a loop filter gain in accordance with a change in velocity received from the velocity estimator; and a loop filter gain unit for multiplying a loop filter gain received from the loop filter gain controller and a frequency error for output. Further, there is provided a method for adjusting a loop filter gain in an automatic frequency controller, having the steps of: estimating a change in velocity in accordance with a movement of a terminal; adjusting a loop filter gain in accordance with the estimated change in velocity; and multiplying the adjusted loop filter value and a frequency error for output.
Owner:SAMSUNG ELECTRONICS CO LTD
Radio broadcast reciever, automatic tuning device for radio broadcast and method for receiving radio broadcast
InactiveUS20080045167A1Resonant circuit detailsBroadcast-related systemsNoise detectionFrequency conversion
A radio broadcast receiver includes: a frequency conversion circuit for receiving a radio broadcast wave and for outputting a reception signal; a detection circuit for detecting the reception signal of an analog radio broadcast wave and for outputting a detection signal; an automatic tuning device for searching a broadcast frequency; and a noise amplifier for amplifying a noise component in the detection signal and for outputting a noise detection signal. The automatic tuning device selects the broadcast frequency when the reception signal level is equal to or larger than a predetermined electric field intensity threshold value and a noise detection signal level is equal to or smaller than a predetermined noise determination threshold value.
Owner:DENSO CORP
Switchable tuneable bandpass filter with optimized frequency response
InactiveUS7106149B2Uniform gain responseAdditional outlayMultiple-port networksTelevision system detailsBandpass filteringCoupling
In a receiver, provision is made of a tuneable switchable bandpass filter comprising a primary resonant circuit and a first secondary resonant circuit. A second secondary resonant circuit can be switched into a part of the first primary resonant circuit, thereby producing a second primary resonant circuit. By virtue of the embodiment of the primary resonant circuit, the bandpass filter is switchable in terms of frequency range with little outlay on circuitry and, on account of the individual embodiment of a first and second secondary resonant circuit with individual coupling elements, can be optimized with regard to a constant amplitude response.
Owner:THOMSON LICENSING SA
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