An optoelectronic device comprising a light-sensitive device which produces or modifies an electric current in dependence upon the intensity of light incident thereon, and a light-emitting device arranged to emit light in response to said electric current and so disposed that part of said emitted light is incident upon the light-sensitive device to provide positive feedback.

A negative-feedback amplifier prevents deterioration of the open-loop gain and the distortion improvement effect despite changes in a sending frequency by demodulating a baseband signal from a carrier and an output signal of an amplifier and a demodulated baseband signal. The negative-feedback amplifier includes a correcting member for correcting a phase error of the demodulated baseband signal caused by a delay in the amplifier for each change of a sending frequency of the carrier.

A feedback network for connecting an output of an operational amplifier with a feedback input of the operational amplifier, wherein the feedback network comprises a feedback circuit. The feedback network comprises a semiconductor switch in series to the feedback circuit for turning off and on the feedback network.

Directional haptic feedback provided in a haptic feedback interface device. An interface device includes at least two actuator assemblies, which each include a moving inertial mass. A single control signal provided to the actuator assemblies at different magnitudes provides directional inertial sensations felt by the user. A greater magnitude waveform can be applied to one actuator to provide a sensation having a direction approximately corresponding to a position of that actuator in the housing...

According to a feedback control method, the response process of set point tracking control is divided into three, tracking, convergence, and stabilization phases. The phase is switched to the tracking phase at set point change start time as the tracking phase start time. The manipulated variable which causes the controlled variable to tracking the set point is continuously output in the tracking phase. The phase is switched to the convergence phase at, as the convergence phase start time, specif...

A control system for resistance welders of the type in which welding current is supplied to a workpiece through a transformer. The system assures weld quality by monitoring the change in resistance across the weld during the welding operation without the need for auxillary leads or separate sensing transducers at or near the workpiece and automatically terminates the welding current when a quality weld is made as determined by weld resistivity characteristics. The system monitors discrete change...

A control system for resistance welders of the type in which welding current is supplied to a workpiece through a transformer. The system assures weld quality by monitoring the change in resistance across the weld during the welding operation without the need for auxillary leads or separate sensing transducers at or near the workpiece and automatically terminates the welding current when a quality weld is made as determined by resistivity characteristics of the weld. The system monitors discrete...

A feedback system for a robot controller provides feedback signals representing incremental motion along an axis in either a first or second direction based upon a pair of encoder signals from a position encoder. The feedback system includes circuitry which produces a pair of signals indicating the state of the first encoder signal and whether the first encoder signal has changed state, and circuitry which produces a pair of signals indicating the state of the second encoder signal and whether t...

A servo motor feedback fault detector that combines the motor drive voltage, the current flowing through the motor and the rotational speed of the motor and compares this combined signal with a dynamic threshold generated by combining a percentage tolerance of the motor current with a percentage tolerance of the motor rotational rate.

A circuit for providing decision feedback equalization uses a variable gain differential amplifier as a level detector and variable gain adjustment to provide nondelayed positive feedback and bit time delayed intersymbol interference compensating feedback to both enhance the amplitude of the present bit and reduce the intersymbol interference of one or more prior bits in a pulse bit stream.