# Translations:Feedback filters/2/en

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Let us describe the constant box of the basic feedback filter. The input to the feedback system is the wavelet , where *n* denotes time. According to our convention, the time index *n* is taken at discrete-time instants spaced one unit apart. We now analyze the feedback filter by tracing the path around the loop. We start at the beginning of the feedback loop (point *A* in Figure 12). We see that the filter output is fed back through the loop and enters the constant box as its input. The constant box carries out a constant multiplication. That is, the output of the constant box is equal to *c* times its input, where *c* is a fixed number. Thus, the impulse-response function of the constant box is the wavelet , so its *Z*-transform is