Abstract: Predictive control system for heating, ventilation and air conditioning comprising controller (20), which comprises: superior layer (21) comprising a comfort questions module (211), a user preference information module (212) and a master algorithm module (213); direct higher layer (22) comprising the dynamic models module (221) and the room regulator module (222); a direct lower layer (23) comprising a heat flux estimator module (231) and a device control module (232); microprocessor; room presence detectors (24), at least one actuator (25), data bus connected to memory and microprocessor. Computer-implemented predictive control method for heating, ventilation and air conditioning installations related to said system.

Abstract: Non-linearities of an electron beam in a cathode ray tube are corrected in accordance with the position of the beam by circuitry which completes the correction from stored digital values. In response to positional signals X and Y, correction waveforms are generated in analog circuits 8H, 8V and 10. The waveforms are scaled by circuits 11 in accordance with the stored digital values and are summed in circuits 9R to 9L and applied to the windings of the cathode ray tube. Preferably the invention is applied to the correction of misconvergence in a shadow mask color tube.