Abstract: A signal processing method for eliminating fixed error sources in the video signal of a pyroelectric vidicon comprising the step of adding the signal value at each point of the pyroelectric plate to previous signal values relating to the same point for forming an integrated or mean value for a great number of signal values at each point and then subtracting the fixed error estimate from the signal values in the latest received video signal. This mean value, if differing from zero, is the estimate of the fixed error at the respective point.

Abstract: A pulse generator for generating pulse groups with desired widths and relations (spacings) within and between the groups up to extremely high speeds and with a time accuracy of the order of nanoseconds e.g. in radar applications. It is purely digital and operates on a control frequency which may be derived from an internal crystal oscillator or may be externally supplied. The generator is divided into two main units, a first unit for determining the spacing of the pulse groups, and a second unit controlled by the first unit for determining the pulse widths and controlling pulse generator means. Different time space numbers and pulse widths numbers may be programmed into PROM memories of said units and may be selected by the same set of operating mode signals. The time spacing may also be optimized by means of an external computer controlling a further PROM holding information which may be combined with the time distance PROM information.