Digital signal level comparison device

In a digital level comparison device having a binary counter, a switching network responsive thereto for adding and removing attenuation from a signal channel, an input to said binary counter for receiving an output from said signal channel and a clock generator producing clock pulses corresponding to a predetermined nominal signal level coupled to said binary counter, said counter having a plurality of stages, each stage having an output coupled to said switching network for delivering thereto an output signal when the counter registration has advanced to that stage, each said stage corresponding to a predetermined attenuation interval thereby forming a plurality of attenuation interval stages, the improvement comprising:

• first and second additional attenuation interval stages forming portions of said attenuation intervals, each attenuation interval corresponding to a said counter stage, and arranged such that advancement of said counter to said first additional interval will cause reduction of said predetermined nominal signal level by a given value and advancement of said counter to said second additional interval will increase said nominal signal level by a given value and
• means connecting said first and second additional interval stages to said clock generator for altering the output thereof in accordance with the counter registration.