Translations:Feedback filters/4/en

If the magnitude of c is less than 1 - that is, if ${|}c{|<}1$ - this box produces a constant attenuation. On the other hand, if the magnitude of c is greater than 1 - that is, if ${|}c{|>1}$ - this box produces a constant amplification. Because the input to the constant box is $y_{n}$, the output from the constant box is $cy_{n}$ (as shown at point B in Figure 12). The action of the constant box in terms of Z-transforms is