Adaptive Thresholding Systems

The conditions under which adaptive thesholding should be employed are discussed. The three most important systems for accomplishing adaptive thresholding are the level adjuster, the constant-fraction discriminator, and the double differentiator. Practical implementations of these systems, including false alarm protection, are described in terms of subsystems. Approximate position variances associated with the three systems are derived. Relative advantages and disadvantages are discussed.