Importance

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Abstract

A microprocessor-controlled exposure control system for a camera uses a modified analogue-to-digital ramp-type converter to trigger an amplitive comparator after a time lapse proportional to the scene brightness as sensed by a photosensor. The comparator output is interrogated at a rate algorithmically governed according to filmspeed sensings to provide an interrogation rate proportional to the filmspeed. A running tally of the number of interrogations until the comparator triggers is kept in memory storage, the resulting number being a digital representation of the filmspeed-scene brightness product. The need for algorithmic multiplication of the digital representations of these two numbers is eliminated.

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First Claim