87 results about "Electronic feedback" patented technology

The field of the invention is that of light boxes used for illuminating optical-valve displays, especially matrix liquid-crystal displays (or LCDs). The illumination from light boxes can at the present time be produced by light-emitting diodes that emit in various spectral bands so as to reconstruct white illumination. For a number of applications, in particular aeronautical applications, it is necessary to maintain the photometric and calorimetric characteristics of this illumination independently of the environmental and ageing conditions of the components. The invention provides an electronic feedback control device for maintaining the photometric and calorimetric characteristics of this illumination at given setpoint values without introducing disturbing optoelectronic devices into the light box. Several possible technical solutions are described.

A fuel control system uses a fuel pump powered by a variable speed pump motor controlled by a closed loop electronic feedback system that tracks motor speed and corrects fuel pump motor speed so that the fuel pump delivers flow according to a desired flow schedule based on the pressure feedback from the manifold.

A method, in a computer system, for processing messages descriptive of an interaction between a user of the computer system and a third party according to a predefined manner includes receiving an electronic message, such that the electronic message includes interaction information associated with an interaction between the user and the third party; verifying integrity of the electronic message; identifying a rule associated with the interaction, including identifying a condition associated with the rule identifying an action to be performed if the condition is met; and performing the action based on the rule and the interaction information in the electronic message if the condition is met.

A wavelength selective switch architecture for ROADMs for switching the spectral channels of a multi-channel, multi-wavelength optical signal between input and output ports employs a biaxial MEMS port mirror array for optimal coupling efficiency and ITU grid alignment, an anamorphic beam expander for expanding input optical signals to create an elongated beam profile, a diffraction grating for spatially separating the spectral channels, an anamorphic focusing lens system, an array of biaxial elongated channel MEMS micromirrors, a built-in Optical Channel Monitor, and an electronic feedback control system. The bi-axial channel micromirrors are rotatable about one axis to switch spectral channels between ports, and are rotatable about an orthogonal axis to vary the coupling of the spectral channel to an output port and control attenuation of the spectral signal for complete blocking or for a predetermined power level. The architecture affords hitless switching, near notchless operation, ITU channel alignment, high passband, stability over a broad temperature range, and minimum insertion loss through the optimal optical coupling efficiency enabled by the feedback control system.

A system, computer program product and method including delivering an initial promotion to a customer, determining a status of the initial promotion delivered, selecting a related promotion based on the status of the initial promotion determined, and delivering the related promotion to the customer. The related promotion is selected based on the status of the initial promotion determined by selecting a predetermined related promotion associated with the status of the initial promotion determined. Moreover, the initial and related promotions may be delivered through an electronic or hard delivery medium, and the status of the initial promotion delivered may be determined by determining a status of the initial promotion based on electronic feedback from the customer or based on predetermined status criteria assigned to the initial promotion. Promotions may be delivered primarily through an effective delivery medium for a particular customer which is determined by applying a predetermined effectiveness criteria which includes one of determining the number of occurrences of a predetermined status within a delivery medium and determining the frequency of the customer's use of the delivery medium.

Embodiments of the present invention use an external cavity laser source with dual input terminals, such as bias current for a gain section, and a voltage signal for a modulator section. An aspect of the present invention provides an ultra-low frequency noise external cavity frequency modulated (FM) semiconductor laser source frequency stabilized by a dual electronic feedback circuitry applied to semiconductor gain section and a modulation section. A further aspect of the present invention provides an optical frequency discriminator based on homodyne phase demodulation using an unbalanced Michelson interferometer with fiber optics delay and a symmetrical 3×3 optical coupler.

A feedback cancellation assembly for an electroacoustic communication apparatus may include a signal transmission path for generation and emission of an outgoing sound signal to an external environment through an electrodynamic loudspeaker and a signal reception path comprising a microphone for generation of a microphone input signal corresponding to sound received from the external environment. The signal reception path may generate a digital microphone signal. The outgoing sound signal may be acoustically coupled to the microphone. An electronic feedback cancellation path may be coupled between a tapping node and a summing node to produce a feedback cancellation signal to the summing node.

A replacement handle for rowing exercise machines. The rowing machine handle described herein is a simple tool which can be added to existing machines to give the user greater feedback and control over training and exercise sessions, on a variety of rowing exercise machines, than is currently available. It is easy to use, and with included applications for mobile devices will help the user to create more effective training sessions and training programs. Said rowing machine handle can be used effectively by a wide range of users. Current rowing machine handles do not provide electronic feedback about the rowing motion or exercise performance. The above replacement handle will provide direct and immediate feedback to the user about his exercise session, including information about his rowing motion (technique) and his exercise performance (physiology).

A computer-based test creation system and method for generating test items. The test creation process includes creating items in electronic form and allowing access by a plurality of reviewers via a network. The reviewers may review the item for content, fairness and format, and collaborate with each other before indicating that the item is acceptable for inclusion in a test. After the administration of the items to test takers, item performance may be evaluated on-line by reviewing electronic feedback from the administrations and creating electronic evaluation reports. Since the items are created in an electronic form, the items may further include new forms of stimuli such as graphics and multimedia.

A system for actively damping the low-frequency coloration of sound in a listening room is provided comprising an acoustic wave sensor, an acoustic wave actuator, and an electronic feedback controller. The listening room defines at least one mode of low-frequency coloration. The acoustic wave actuator is substantially collocated with the acoustic wave sensor within the listening room. The electronic feedback controller is operative to generate a signal at its output by applying a feedback controller transfer function. The feedback controller transfer function comprises a second order differential equation including a first variable representing a predetermined damping ratio and a second variable representing a tuned natural frequency and creates a 90 degree phase lead substantially at the resonant frequencies of at least one mode of low-frequency coloration. The feedback controller output signal represents a rate of change of volume velocity to be produced by the acoustic wave actuator. Further provided are methods for actively damping the low-frequency coloration of sound within a listening room and systems for actively treating noise within a fluid-carrying duct, including those which employ active low- and high-pass acoustic filters.

We disclose an optical transponder, in which one or more all-electronic feedback paths are used to obtain a relatively accurate estimate of the device-specific signal distortions in the transmitter portion thereof. The obtained estimate is used to enable the digital signal processor of the optical transponder to carry out electronic pre-distortion (EPD) that can significantly reduce or cancel these signal distortions without the use of detailed factory-calibration measurements or optics dedicated to feedback purposes. The use of all-electronic feedback paths may enable a beneficial reduction in the cost of the EPD functionality, e.g., by eliminating a significant extra cost associated with the implementation of optically generated feedback.

A drive mechanism for back pressure regulator used in liquid chromatography, supercritical fluid chromatography, or supercritical fluid extraction allows very fine automated control over a very wide range of pressures by combining a linear actuator compressing a spring, pushing a pin. The nozzle assembly of the regulator comprises a flow through chamber containing a diaphragm and a seat, in which the pin pushes the diaphragm against the seat, together with an upstream pressure sensor and electronic feedback control to the motor of the actuator. The BPR of the embodiments exhibits high pressure stability and extremely low pressure noise, even at moderate to high pressures. The exemplary BPR can be use at either constant pressure or to generate pressure programs where the pressure is varied versus time. Further, the nozzle assembly has a field-replaceable head, requiring no mechanical adjustment on replacement.

A CO₂ laser reference oscillator (RO) can provide injection seeding to a Q-switched (QS) or Q-switched cavity dumped (QSCD) CO₂ laser, where the output frequency of the RO laser is locked to the peak of the laser line by the use of appropriate electronics to dither one of the resonator mirrors of the reference oscillator. This injected radiation seeds the radiation building up within the Q-switched laser cavity, such that the oscillating frequency favors the wavelength of the injected radiation. An electronic feedback control circuit can be used to lock an axial mode of the Q-switched laser to line center. The change in build-up time of the pulses within the QS laser can be used to maintain cavity length at a value that enables oscillating at the peak of the same laser line that is injected into QS laser.

A computer-based test creation system and method for generating test items. The test creation process includes creating items in electronic form and allowing access by a plurality of reviewers via a network. The reviewers may review the item for content, fairness and format, and collaborate with each other before indicating that the item is acceptable for inclusion in a test. After the administration of the items to test takers, item performance may be evaluated on-line by reviewing electronic feedback from the administrations and creating electronic evaluation reports. Since the items are created in an electronic form, the items may further include new forms of stimuli such as graphics and multimedia.

A half bridge resonant converter comprises a half bridge inverter having a high side switch and a low side switch with an output defined from a node between the high side switch and the low side switch. The output connects to a resonant circuit. There are separate control circuits for generating the gate drive signals for controlling the switching of the high side switch and low side switch, in dependence on an electrical feedback parameter, each with different reference voltage supplies.

A system and method for the monitoring of ammonia in a fluid. The ammonia monitoring system includes an ammonia sensor that is configured to detect trace amounts of ammonia (NH₃) in a fluid (i.e., gas or liquid) that is pumped through it in real time. The real time ammonia sensor includes an interferometer configured to track the amount of ammonia that is pumped into the real time ammonia sensor. The ammonia monitoring system, via the real time ammonia sensor, is further configured to detect ammonia levels in industrial poultry houses and provide electronic feedback to the building's ventilation control system.

The invention provides a lever feedback electrohydraulic servo mechanism for solving the problems of an electronic feedback electrohydraulic servo mechanism such as zero drift, poor positioning accuracy, weak capacity of resisting oil interference of an electrohydraulic servo valve, higher failure rate and poor reliability. The key points of the lever feedback electrohydraulic servo mechanism are as follows: the lever feedback mechanism is employed, an electrohydraulic actuator is taken as a conversion device, and a slide-valve pilot valve controlled by a mechanical force and an oil cylinder form the lever feedback electrohydraulic servo mechanism. The lever feedback electrohydraulic servo mechanism has the beneficial effects of high positioning accuracy, high stability, strong capacity of resisting oil pollution, high operating safety and high operating reliability. The lever feedback electrohydraulic servo mechanism can be applied to an electrohydraulic control system instead of the electronic feedback electrohydraulic servo mechanism for driving various controlled objects.

A method, computer program product, and computer system for a sentiment action process. Electronic feedback reports about a version of a product are received over a network from one or more users of a plurality of users. Sentiment of at least a portion of the electronic feedback reports about the version of the product is analyzed. The sentiment of at least the portion of the electronic feedback reports about the version of the product is determined to have reached a threshold. In response to determining that the sentiment of at least the portion of the electronic feedback reports about the version of the product has reached the threshold, the version of the product is automatically changed to a second version of the product.