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272 results about "Digital feedback" patented technology
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Network architecture for remote robot with interchangeable tools
ActiveUS20060074525A1Slow feedback loopLess time-critical decisionProgramme controlProgramme-controlled manipulatorDigital feedbackAuto-configuration
Systems, methods and devices for the remote control of a robot which incorporates interchangeable tool heads. Although applicable to many different industries, the core structure of the system includes a robot with a tool head interface for mechanically, electrically and operatively interconnecting a plurality of interchangeable tool heads to perform various work functions. The robot and tool head may include several levels of digital feedback (local, remote and wide area) depending on the application. The systems include a single umbilical cord to send power, air, and communications signals between the robot and a remote computer. Additionally, all communication (including video) is preferably sent in a digital format. Finally, a GUI running on the remote computer automatically queries and identifies all of the various devices on the network and automatically configures its user options to parallel the installed devices. Systems according to the preferred embodiments find particular application in the pipeline arts. For example, interchangeable tool heads may be designed to facilitate inspection, debris clearing, cleaning, relining, lateral cutting after relining, mapping, and various other common pipeline-related tasks.
Owner:REDZONE ROBOTICS
Active noise reduction for audiometry
InactiveUS6396930B1Maximize noise control performanceAccurate comparisonEar treatmentAudiometeringNoise controlNoise field
The technology of active noise reduction (ANR) is incorporated into audiometry testing in a variety of formats. Analog feedback, digital feedback, adaptive feedforward, and adaptive feedback noise control schemes are presented for use in audiometry to reduce the ambient noise heard by the test subject, allowing subject testing in higher ambient noise fields. Audiometer test signals are appropriately compensated so the test results are accurate and comply with existing calibration standards for audiometers. Existing audiometry headphone technologies are modified so that ANR can be accomplished while satisfying existing standards for audiometric testing. Embodiments are also defined for alternate headphone arrangements that may not conform to current (1997) audiometric testing standards but provide sufficient performance advantages to warrant new standards for audiometry testing in the future.
Owner:GENTEX CORP
Configurable LED driver/dimmer for solid state lighting applications
ActiveUS20110204820A1Reduce power consumptionImprove efficiencyElectroluminescent light sourcesElectric light circuit arrangementDigital feedbackDimmer
The disclosure is directed at a configurable light emitting diode (LED) driver / dimmer for controlling a set of light fixture loads comprising: a power circuit; a primary digital controller for controlling the power circuit; a set of output current drivers, each of the set of output current drivers connected to one of the set of light fixture loads for controlling the associated light fixture load; a secondary digital controller for controlling the set of output current drivers; wherein the secondary controller transmits LED control information to control outputs of the set of output current drivers; and wherein the secondary digital controller provides digital feedback control information to the primary digital controller.
Owner:MATE
Digital voltage regulator using current control
InactiveUS6853169B2Reduce current rippleReduce in quantityApparatus without intermediate ac conversionDc source parallel operationDigital feedbackControl signal
A digitally implemented voltage regulator having including a plurality of slaves coupled in parallel. Each slave includes a switching circuit that intermittently couples an input terminal and an output terminal of the voltage regulator in response to a digital control signal for the corresponding slave. A current sensor in each slave generates a digital first feedback signal derived from the current passing through the corresponding switching circuit. A digital controller receives and uses the digital feedback signals from the plurality of slaves to generate a digital control signal for each slave. The digital controller operates active slaves of the plurality of slaves at determined phase offsets to minimize voltage ripple and maintain the output voltage at the output terminal at a substantially constant level.
Owner:VOLTERRA SEMICONDUCTOR
Digital to analog converter
ActiveUS7038608B1Reduce the amount of noiseImprove transient responseElectric signal transmission systemsDigital-analogue convertorsDigital feedbackClock rate
A digital to analog converter includes a digital processor having an input port adapted to receive an input signal and an output port coupled to an input port of an analog filter wherein the digital processor includes a digital feedback loop which compares a reference digital voltage with a digital voltage provided by a digital model of the analog filter. Using a completely digital feedback loop which compares an input digital voltage with the digital voltage from the digital model of the analog filter results in a single bit digital to analog converter having improved accuracy for a given clock rate and filter. The next digital state of the converter (i.e. ‘0’ or ‘1’) is selected based upon a comparison of the input (or reference) voltage with the digital voltage provided by the digital feedback loop. The digital converter output is then fed to the analog filter. If the analog filter matches the digital model, then the analog voltage will match the digital voltage, and therefore the reference voltage.
Owner:VALEO RADAR SYST
Intensity Noise Reduction Methods and Apparatus for Interferometric Sensing and Imaging Systems
ActiveUS20110228280A1Reduce noiseSuppress noiseGain controlUsing optical meansDigital feedbackControl signal
In part, aspects of the invention relate to methods, apparatus, and systems for intensity and / or pattern line noise reduction in a data collection system such as an optical coherence tomography system that uses an electromagnetic radiation source and interferometric principles. In one embodiment, the noise is intensity noise or line pattern noise and the source is a laser such as a swept laser. One or more attenuators responsive to one or more control signals can be used in conjunction with an analog or digital feedback network in one embodiment.
Owner:LIGHTLAB IMAGING
Configurable LED driver/dimmer for solid state lighting applications
ActiveUS20120280637A1Available powerReduce power consumptionElectrical apparatusElectroluminescent light sourcesDigital feedbackDimmer
The disclosure is directed at a configurable light emitting diode (LED) dimmer for controlling a set of light fixture loads comprising: a power circuit; a primary digital controller for controlling the power circuit; a set of output current drivers, each of the set of output current drivers connected to one of the set of light fixture loads for controlling the associated light fixture load; a secondary digital controller for controlling the set of output current drivers; wherein the secondary controller transmits LED control information to control outputs of the set of output current drivers; and wherein the secondary digital controller provides digital feedback control information to the primary digital controller.
Owner:MATE
Wide range power supply
ActiveUS20070008745A1Operation efficiency is highHigh operating requirementsEfficient power electronics conversionConversion with intermediate conversion to dcResonant inverterAnalog feedback
A wide range power supply capable of delivering 20V to 5000V is provided. The power supply of the present invention uses switch mode technology to achieve high overall operating efficiency and is capable of operating from no load to full load without loss of regulation. The power supply in accordance with the embodiments of the present invention operates directly from the utility supply (e.g., 110V / 220V and 50 Hz / 60 Hz). In one embodiment, the power supply's power conversion stage includes the following stages: an input rectifier; a buck converter; a quasi-resonant inverter; and a voltage multiplier. The above indicated stages are connected in series to achieve the large output voltage range. High precision is obtained from a use of a digital feedback loop, possibly in connection with an analog feedback loop.
Owner:BIO RAD LAB INC
Digital feedback display panel for communicating computer status information
A personal computer system provides a digital feedback display panel and supporting software to provide digital computer status feedback for a user. The digital feedback display panel is integrated with a computer housing of the computer system. The supporting software detects status notification messages which are processed and communicated to the digital feedback display panel. The digital feedback display panel provides display feedback to the user based on the detected status notification messages. The display feedback can take the form of status icons and blinking text messages displayed on the digital feedback display panel. Examples of status conditions of the computer system which can be communicated to the user include (i) a connection state of a peripheral device to the computer system, (ii) the computer system is connected to the Internet, (iii) an indication of how many unread e-mails for the computer system are available, and (iv) network time for a server coupled to the computer system.
Owner:HEWLETT PACKARD DEV CO LP
Laser scanning and power control in a rapid prototyping system
ActiveUS20060215246A1Smooth transitAdditive manufacturing apparatus3D object support structuresDigital feedbackLaser scanning
Owner:3D SYST INC
Power supply with a digital feedback loop
ActiveUS7324354B2High operating requirementsLow costEfficient power electronics conversionConversion with intermediate conversion to dcResonant inverterDigital feedback
A wide range power supply capable of delivering 20V to 5000V is provided. The power supply of the present invention uses switch mode technology to achieve high overall operating efficiency and is capable of operating from no load to full load without loss of regulation. The power supply in accordance with the embodiments of the present invention operates directly from the utility supply (e.g., 110V / 220V and 50 Hz / 60 Hz). In one embodiment, the power supply's power conversion stage includes the following stages: an input rectifier; a buck converter; a quasi-resonant inverter; and a voltage multiplier. The above indicated stages are connected in series to achieve the large output voltage range. High precision is obtained from a use of a digital feedback loop, possibly in connection with an analog feedback loop.
Owner:BIO RAD LAB INC
Differential front-end continuous-time sigma-delta ADC using chopper stabilisation
ActiveUS20060139192A1Less sensitive to substrate noiseReduce thermal noiseAnalogue/digital conversionElectric signal transmission systemsIntegratorDigital feedback
A multi-bit continuous-time sigma-delta analog-to-digital converter (ADC) has a differential input stage which receives an analog input signal current. A multi-bit feedback current digital-to-analog converter (IDAC) generates a multi-level feedback current depending on a digital feedback signal from a flash ADC. An integrator has a differential input that integrates the difference of the generated current by the multi-bit IDAC and the input signal current on a continuous-time basis. The input stage further comprises a first biasing current source and a second biasing current source which bias the input stage in a mid-scale condition. A first summing node connects to the first differential input line, a first differential input of the integrator and the first output branch. A second summing node connects to the second differential input line, a second differential input of the integrator and the second output branch. A set of chopping switches alternately connect the biasing current sources to the summing nodes in a first configuration and a second, reversed, configuration. The converter receives a modulator clock signal at a frequency FS and the chopping switches can operate at FS or a binary subdivision thereof. The integrator amplifier can also be chopper-stabilized.
Owner:ANALOG DEVICES INC
Non linear controlled power supply with a linear soft start operation
InactiveUS7315160B2Ac-dc conversion without reversalConversion with intermediate conversion to dcMicrocontrollerDigital feedback
Owner:SILICON LAB INC
Capacitive transducer circuit and method
ActiveUS20100315272A1Analogue/digital conversionElectric signal transmission systemsDigital feedbackAudio power amplifier
A capacitive transducer circuit comprises a capacitive transducer having first and second electrodes. The first and second electrodes are biased by respective first and second bias voltages. An amplifier is connected to receive a first analogue signal on an input terminal, the first analogue signal being generated by the capacitive transducer, and to generate a second analogue signal on an output terminal. A digital feedback circuit is connected between the output terminal of the amplifier and the input terminal of the amplifier. The digital feedback circuit is configured to provide one of said first or second bias voltages. The output of a voltage source which provides the other bias voltage for the capacitive transducer may be filtered by a low pass filter. The low pass filter may comprise a switched capacitor filter circuit.
Owner:CIRRUS LOGIC INC
Network architecture for remote robot with interchangeable tools
ActiveUS7720570B2Programme controlProgramme-controlled manipulatorDigital feedbackAuto-configuration
Owner:REDZONE ROBOTICS
Digital Polar Transmitter
ActiveUS20080225984A1Simultaneous amplitude and angle modulationDc level restoring means or bias distort correctionAudio power amplifierDigital feedback
A digital polar transmitter includes a baseband processor configured to receive an input signal and to convert the input signal into a baseband amplitude component and a baseband phase component. The transmitter also includes a phase modulator in communication with the baseband processor. The phase modulator is configured to modulate an RF carrier signal based on the phase component and to generate a phase-modulated RF carrier signal. A power amplifier is provided in communication with the baseband processor and the phase modulator. The power amplifier is configured to amplify the phase-modulated RF carrier signal based on the baseband amplitude component and to generate an amplified RF signal. The transmitter also includes a digital feedback loop in communication with the power amplifier and the baseband processor. The digital feedback loop is configured to detect the amplified RF signal and to provide a digital amplitude feedback signal and a detected phase feedback signal to the baseband processor.
Owner:EAGLE TECH LLC
Testing device and testing method of electric steering engine
ActiveCN102788956AEasy to testEngine testingProgramme control in sequence/logic controllersDigital feedbackNetwork Communication Protocols
The invention discloses a testing device and a testing method of an electric steering engine. The testing method is characterized in that a digital control instruction is sent and a digital feedback signal is received by an industrial control computer; communication protocol conversion is carried out upon the digital control instruction and the feedback signal by a test transfer box; when the electric steering engine to be tested is of analogue type, digital-to-analogue conversion is carried out upon the digital control instruction signal after communication protocol conversion to generate an analogue control instruction; analogue-to-digital conversion is carried out upon a feedback signal after communication protocol conversion to generate a digital feedback signal; the electric steering engine to be tested is controlled by an electric steering engine controller to drive a simulated load table to work according to the digital control instruction or the analogue control instruction, and a signal generated during work is sent to the test transfer box to be used as a feedback signal. According to the testing device and the testing method disclosed by the invention, the entire test device is commonly used in test of analogue and digital electric steering engines through functions of analogue-to-digital conversion and digital-to-analogue conversion of the test transfer box, so that the test process is simplified.
Owner:SICHUAN AEROSPACE FENGHUO SERVO CONTROL TECH CO LTD
Self calibrating transmit path correction system
ActiveUS7313198B2Carrier regulationModulation with suppressed carrierDigital feedbackPhase imbalance
A transmit path correction system (34) for compensating for digital DC offsets, I / Q gain imbalances and I / Q phase imbalances includes a mixed signal forward path (36) and a mixed signal feedback path (38). The forward pat (36), which is operable to process input data symbols to produce at least one analog output signal, preferably includes a digital DC offset correction circuit (86) for compensating for digital DC offsets in the forward path (36) using at least one digital feedback signal (82, 84), an I / Q phase equalization circuit (90) for compensating for the I / Q phase imbalances in the forward path (36), and an I / Q gain equalization circuit (88) for compensating for the I / Q gain imbalances in the forward path (36) using the digital feedback signal(s) (82, 84). The feedback pat (38) processes the analog output of the forward path (36) to produce the digital feedback signal(s) (82, 84).
Owner:GOOGLE TECH HLDG LLC
AC output power supply with digital feedback loop
InactiveUS7502697B2Level controlCounting objects with random distributionDigital feedbackControl signal
An AC power supply includes a digital feedback loop for output regulation. The feedback loop generates an RMS control signal that is mixed with a desired waveform to produce an input for a feedback loop that generates an instantaneous control signal. The instantaneous control signal is used to regulate power supply output.
Owner:PROGRAMMABLE DIV OF XANTREX TECH
Capacitive transducer circuit and method
ActiveUS20090279719A1Substation/switching arrangement detailsSemiconductor electrostatic transducersDigital feedbackAudio power amplifier
A capacitive transducer circuit includes a capacitive transducer having first and second electrodes. The first and second electrodes are biased by respective first and second bias voltages. An amplifier is connected to receive a first analog signal on an input terminal, the first analog signal being generated by the capacitive transducer, and to generate a second analog signal on an output terminal. A digital feedback circuit is connected between the output terminal of the amplifier and the input terminal of the amplifier. The digital feedback circuit is configured to provide one of said first or second bias voltages. A switched capacitor filter circuit may be arranged between the voltage source and the transducer and may be arranged to filter the output of the voltage source.
Owner:CIRRUS LOGIC INC
Non linear controlled power supply with a linear soft start operation
InactiveUS20060023476A1Ac-dc conversion without reversalConversion with intermediate conversion to dcMicrocontrollerDigital feedback
A system for controlling a soft start for a switching converter includes a digital feedback control system for receiving an analog voltage signal representing the output of a switching converter, for digitally processing the analog voltage signal by comparing it to a corrected reference voltage to generate a voltage error signal and for generating drive signals to control the operation of the switching converter to provide a regulated output. A microcontroller providers a secondary feedback loop for generating the corrected reference voltage. The secondary feedback loop enabling the output voltage signal to vary linearly over time during a soft start.
Owner:SILICON LAB INC
Monitoring and control of power converters
InactiveUS20090309567A1Adjust in timeDc-dc conversionElectric variable regulationDigital feedbackFrequency measurements
A digital controller configured to inject a signal into a digital feedback path that facilitates regulation of a power converter and measure the corresponding phase, gain, or frequency. The digital controller may also include an adaptive tuning controller for adjusting power converter operating attributes based in part on the measurements. In an exemplary embodiment, the adaptive tuning controller uses the phase, gain, and / or frequency measurements to adjust the digital feedback signal. In an exemplary embodiment, the adaptive tuning controller compares the operating measurements with desired values and generates adjusted operating attributes. In accordance with an exemplary embodiment, the monitoring and adjusting of the digital feedback signal occurs while the digital controller is regulating a power signal in the power converter.
Owner:UNIV OF COLORADO THE REGENTS OF
Switching converter systems with isolating digital feedback loops
ActiveUS20110242858A1Conversion with intermediate conversion to dcDc-dc conversionDigital feedbackTransformer
Switching converter systems are provided to control output voltage across a load by means of a converter forward path and a converter feedback path. The forward path preferably includes a transistor, an inductive element, a diode and a capacitor arranged to switchably exchange energy with the capacitor to thereby generate the output voltage. The feedback path preferably extends from the capacitor and is configured to digitally control a duty cycle of the transistor in response to the output voltage. In a system embodiment, the feedback path includes at least one comparator arranged to provide a digital error signal in response to a comparison of the output voltage to a reference voltage; a first isolation channel configured to isolatably transport a clock signal to digitally gate the error signal; a second isolation channel configured to isolatably transport the error signal; and a controller coupled to the first and second isolation channels and configured to control the duty cycle in response to the error signal. A transformer is preferably inserted into the first and second isolation channels to enhance isolation and, preferably, the first and second isolation channels respectively include first and second digital gates that each have an output port coupled to an input port of the other.
Owner:ANALOG DEVICES INC
Method and apparatus for providing an interactive language tutor
InactiveUS7299188B2Meaningful feedbackFocusNatural language translationDigital computer detailsDigital feedbackRemedial action
A method and apparatus for generating a pronunciation score by receiving a user phrase intended to conform to a reference phrase and processing the user phrase in accordance with at least one of an articulation-scoring engine, a duration scoring engine and an intonation-scoring engine to derive thereby the pronunciation score. The scores provided by the various scoring engines are adapted to provide a visual and / or numerical feedback that provides information pertaining to correctness or incorrectness in one or more speech-features such as intonation, articulation, voicing, phoneme error and relative word duration. Such useful interactive feedback will allow a user to quickly identify the problem area and take remedial action in reciting “tutor” sentences or phrases.
Owner:LUCENT TECH INC +1
Delta-Sigma-Delta Modulator
InactiveUS20110006937A1Electric signal transmission systemsAnalogue conversionDigital feedbackEngineering
An Analog-to-Digital Converter (ADC) is provided. An embodiment of the ADC includes a modified Delta modulator including a digital feedback loop, and a digital Sigma-Delta modulator configured within the feedback loop. Embodiments of the invention provide analog functionality with all the benefits of a digital design process as well as various other advantages provided by a Delta-Sigma-Delta modulator configuration.
Owner:STELLAMAR
RF transmitter with digital feedback for MRI
InactiveUS20100141257A1The method is simple and reliableAvoid instabilityElectric/magnetic detectionMeasurements using NMRNMR - Nuclear magnetic resonanceCoil array
A method and an RF transmit system for generating RF transmit signals for feeding an RF transmitter (14) in the form of, or comprising, one or more antenna device(s), coil(s), coil elements, or coil array(s) is disclosed. Furthermore, a multi-channel RF transmit system for feeding a plurality of such RF transmitters, especially for use as an RF excitation system in a magnetic resonance imaging (MRI) system for exciting nuclear magnetic resonances (NMR) is disclosed. A demand RF transmit signal is compared in the digital domain with an RF transmit signal and digitally corrected with respect to differences or errors between both by means of a complex predistorter (11), an adaption unit (17) and a look-up table unit (18).
Owner:KONINKLIJKE PHILIPS ELECTRONICS NV
Methods and systems for digital dither
InactiveUS20020057214A1Electric signal transmission systemsDifferential modulationDigital feedbackAnalog feedback
Methods and systems for applying digital dither includes methods and systems for applying digital dither in data converters, such as, for example, delta-sigma data converters. In an embodiment, an analog signal from a first path of a delta-sigma modulator is quantized to an m-bit digital signal and an n-bit dithered digital feedback signal is generated from at least a portion of the m-bit digital signal. The n-bit dithered digital feedback signal is converted to an analog feedback signal and fed back to a second path of the delta-sigma modulator. In an embodiment, the n-bit dithered digital feedback signal is generated by selecting one of a plurality of sets of n-bits from the m-bit digital signal depending upon a state of a dither control signal. The dither control signal can alternate between a plurality of states or pseudo-randomly switch between a plurality of states. In an embodiment, the m-bit digital signal is an m-bit thermometer code signal and the n-bit dithered digital feedback signal is generated by selecting between bits 0 through m-2 and bits 1 through m-1 of the m-bit digital signal. In an alternative embodiment, the m-bit digital signal is an m-bit thermometer code signal and the n-bit dithered digital feedback signal is generated by selecting between even and odd bits of the m-bit digital signal.
Owner:AVAGO TECH INT SALES PTE LTD
Method and apparatus to reduce internal circuit errors in a multi-bit delta-sigma modualtor
ActiveUS20080100486A1Reduce errorsElectric signal transmission systemsDifferential modulationDigital analog converterDigital feedback
An N-bit delta-sigma modulator reduces circuit errors associated with an internal N-bit digital-to-analog converter by replacing the N-bit digital-to-analog converter with a digital feedback circuit comprising a ternary digital-to-analog converter and an (N−1)-bit digital-to-analog converter. The internal N-bit digital-to-analog converter is typically used to generate a global feedback signal that is provided to a first summation circuit. To provide an equivalent function but with better noise transfer characteristics, the digital feedback circuit generates two feedback signals. The ternary digital-to-analog converter is part of a first feedback path that generates a first feedback signal for the first summation circuit, and the (N−1)-bit digital-to-analog converter is part of a second feedback path that generates a second feedback signal for the first summation circuit or a subsequent summation circuit.
Owner:REALTEK SEMICON CORP
Digital offset phase-locked loop
ActiveUS7746178B1Reducing loop gainKeep linearPulse automatic controlDigital feedbackDigital control oscillator
The present invention relates to a digital offset phase-locked loop (DOPLL), which may have advantages of size, simplicity, performance, design portability, or any combination thereof, compared to analog-based phase-locked loops (PLLs). The DOPLL may include a digital controlled oscillator (DCO), which provides a controllable frequency output signal based on a digital control signal, a radio frequency (RF) mixer circuit, which provides a reduced-frequency feedback signal based on the controllable frequency output signal without reducing loop gain, a time-to-digital converter (TDC), which provides a digital feedback signal that is a time representation of the reduced-frequency feedback signal, and digital PLL circuitry, which provides the digital control signal based on the digital feedback signal and a digital setpoint signal.
Owner:QORVO US INC
Configurable LED driver/dimmer for solid state lighting applications
ActiveUS8525446B2Available powerReduce power consumptionElectroluminescent light sourcesElectric light circuit arrangementDigital feedbackPower flow
The disclosure is directed at a configurable light emitting diode (LED) driver / dimmer for controlling a set of light fixture loads comprising: a power circuit; a primary digital controller for controlling the power circuit; a set of output current drivers, each of the set of output current drivers connected to one of the set of light fixture loads for controlling the associated light fixture load; a secondary digital controller for controlling the set of output current drivers; wherein the secondary controller transmits LED control information to control outputs of the set of output current drivers; and wherein the secondary digital controller provides digital feedback control information to the primary digital controller.
Owner:MATE
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