1. A method of noisy signal analysis, comprising: (a) setting a predetermined step function, wherein said predetermined step function changes each signal in a signal group to a first identical value; (b) changing a threshold value of said predetermined step function to a first threshold value which induces a first step function, wherein said first step function changes a signal in said signal group from becoming said first identical value to becoming a second identical value; and (c) continuing changing said first threshold value of said first step function to a second threshold value which induces a second step function, wherein said second step function changes all signals in said signal group from becoming said first identical value to becoming said second identical value.