Abstract: A system and method for sensing position and/or displacement of a moving, substrate, ram, target, piston, encoder wheel or the like. The system includes a plurality of transducers for generating two sinusoidal signals in quadrature related to the position and displacement of the substrate, ram or the like. Alternatively, the sinusoidal signals may be generated by other well-known devices, such as by an optical encoder or the like. The two sinusoidal signals in quadrature are processed to provide enhanced resolution compared to conventional quadrature systems. The system is also capable of self-calibration in order to accommodate fluctuations in the two sinusoidal signals in quadrature.

Abstract: A software extension that monitors a hardware-level or operating system-level representation of the visual state of a running computer application. The software extension processes the time-sequence of visual information extracted to approximate some of the internal, non-graphical application data structures and program state. The software transforms, refines, or augments the data acquired with acquired personal data or network data to form derived data. The derived data then is presented to the user to create a new application feature. This presentation may be displayed alongside the application or operating system's existing graphical user interface.

Abstract: An improved encoder interface system, able to track absolute position at higher encoder velocities without aliasing. The device and related apparatus, method and computer program product can perform this operation without loss of precision or accuracy. The improved encoder interface system can predict the phase angle of the signal for each sampling iteration and then measure the angular difference between the predicted phase angle and the actual phase angle to account for acceleration. The predictive capacity of the system thereby minimizes the problem of aliasing. As a result of this technique, aliasing will only occur when the acceleration of the object being observed exceeds a certain threshold that, like the Nyquist frequency, is dependent on the sampling rate of the signal acquisition component. Importantly, in most applications, this acceleration limit greatly exceeds any possible acceleration that the system will undergo.

Abstract: A system and method for sensing position and/or displacement of a moving, substrate, ram, target, piston, encoder wheel or the like. The system comprises a plurality of transducers for generating two sinusoidal signals in quadrature related to the position and displacement of the substrate, ram or the like. Alternatively, the sinusoidal signals may be generated by other well-known means, such as by an optical encoder or the like. The two sinusoidal signals in quadrature are processed to provide enhanced resolution compared to conventional quadrature systems. The system is also capable of self-calibration in order to accommodate fluctuations in the two sinusoidal signals in quadrature.