stuff from 400G analysis (project deliv 01)

Classes/04_DSP/Equalizer/Postfilter.m

@@ -67,22 +67,29 @@ classdef Postfilter < handle
 
         end
 
-        function showFilter(obj,noiseclass_in,options)
+        function showFilter(obj,options)
 
             arguments
                 obj 
-                noiseclass_in 
+                options.noiseclass_in =[]
                 options.fignum = 121
                 options.color = []
             end
 
             % noiseclass_in.spectrum('displayname','Noise PSD shifted to 0dBm','fignum',options.fignum,'normalizeTo0dB',1);
-            
+            if ~isempty(options.noiseclass_in)
+            len = length(options.noiseclass_in);
+            fs = options.noiseclass_in.fs;
+            else
+                len = 1024;
+                fs = 1;
+            end
+
             figure(options.fignum)
-            [h,w] = freqz(1,obj.coefficients,length(noiseclass_in),"whole",noiseclass_in.fs);
+            [h,w] = freqz(1,obj.coefficients,len,"whole",fs);
             h = h/max(abs(h));
             hold on
-            w_ = (w - noiseclass_in.fs/2);
+            w_ = (w - fs/2);
             
             if isempty(options.color)
                 plot(w_.*1e-9,20*log10(fftshift(abs(h))),'DisplayName',['Burg Coeffs: ', num2str(round(obj.coefficients,2)), ' '],'LineWidth',2);