Procedures of rational coding are classified by their opportunity to change parameters and structure of the coding device for ensuring compression of data. Exist fixed, parametrically - adaptive and nonparametric - adaptive procedures of rational coding.
At division of channels according to a form (RKF) basic functions (t) have to be minimum independent and it is desirable ortogonalna. Thus the transferred information is concluded in amplitude of basic functions. In case of RKF basic functions have the following appearance: