Qinetiq Limited

Selina A Ballantyne

Robin Jones

Adrian Sean Coffey

Martin Johnson

An apparatus for producing a digital depiction of a signal ( ) which is adaptive to the signal itself. A constant rate sampling means, such as an analogue to digital converter ( ), samples the signal ( ) at a constant rate and produces a first digital depiction ( ) of a signal. A transformation means ( ) is responsive to the first digital depiction ( ) and produces a second digital depiction based on the evolution of the signal. The transformation means may be capable of determining when a predetermined threshold level has been crossed and measuring the time interval between predetermined threshold level crossings. The transformation means ( ) may include a logic arrangement and a timer counter and is run from a clock signal ( ) from the same clock ( ) as drives the sampling means. A method of adapting a conventional ADC ( ) to adaptively sample the signal ( ) by adding a transformation means ( ) run off the same clock ( ) as the ADC ( ) is also provided.

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Malvern, United Kingdom

Selina A Ballantyne