4 plot_ ale

Purpose

Displays the adaptive filter transfer function and the signals involved in adaptive line enhancer applications.

Syntax

plot_ale(w,x,y,e)

Description

plot_ale() displays the adaptive filter transfer function and the signals of interest in adaptive line enhancer applications. plot_ale() takes as input parameters the adaptive filter coefficients vector $w(n)$, the filter input signal $x(n)$, output signal $y(n)$, and error signal $e(n)$ and returns after rendering the ALE graph. The variables of plot_model() are summarized below.

 
Input Parameters ::
   w  : The adaptive filter response
   x  : filter input signal (narrow-band + wide-band)
   y  : filter output signal (narrow-band)
   e  : error signal (wide-band)

Example

Figure 9.3: The adaptive line enhancer graph window.

An example ALE graph generated using plot_ale() is shown in Fig. 9.3. The top left and right panels display the impulse response and frequency response of the adaptive filter, respectively. The next three panels display the line enhancer input $x(n)$, output $y(n)$, and error $e(n)$, respectively.