Abstract: A projectile fuze contains a radio receiver, an oscillator, a counter and detonation means activated by an output signal from the counter. After firing the oscillator is started for a unit time period defined by successive signals transmitted to the projectile from a transmitter. The number of oscillations counted in the unit time period is multiplied by the number of unit time periods until detonation, calculated from range data, and transmitted to the projectile to set a counting limit for the counter before it produces an output signal. The signal containing the range data is used to clear the counter and restart the oscillator and may be used to render the radio receiver unresponsive to further signals. The projectile may have a booster or air-brake which is operated in flight by means of a second counter output signal or an output signal from an additional counter.

Abstract: For weighting input signal in accordance with a mathematical transfer function represented by a plurality of straight lines each of which intersects the next at a separate break-point, signal processing apparatus receives or generates a train of pulses, the number of pulses received over a sampling period being related to the signal, and detects preset numbers of pulses corresponding to the break-points, the number detected at the end of the sampling period identifying the highest break-point reached. The detection of each break-point is used to produce an analogue signal corresponding to the value of the break-point and a voltage source is selected corresponding to the gradient of the straight line section following the break-point. Pulses received after each break-point are counted, to be re-set at the next break-point, and the total at the end of the sampling period multiplied by the gradient in a D/A converter to give the analogue value of the signal in excess of the highest break-point.