Band pass gain fix

Band Pass Chebyshev/band_pass_design.m

@@ -300,6 +300,7 @@ units_alpha = zeros([1 band_pass_number_of_poles]);
 units_Z2 = zeros([1 band_pass_number_of_poles]);
 units_Z3 = zeros([1 band_pass_number_of_poles]);
 unit_transfer_function = [tf(1) tf(1) tf(1) tf(1)];
+units_filter_central_frequency_gain = zeros([1 band_pass_number_of_poles]);
 
 for i=1:band_pass_number_of_poles
     % Calculates BW using the eq. 7-62
@@ -331,7 +332,17 @@ for i=1:band_pass_number_of_poles
     % Calculates the gain at the central radial frequency and the alpha
     % parameter using the eq. 7-89
     units_central_frequency_gain(1,i) = 2*band_pass_poles_Q(1,i)^2;
-    units_alpha(1,i) = 1/units_central_frequency_gain(1,i);
+    %units_alpha(1,i) = 1/units_central_frequency_gain(1,i);
+    
+    % 11-58
+    units_filter_central_frequency_gain(1,i) = sqrt((2*band_pass_poles_Q(1,i)* ...
+        band_pass_poles_radial_frequencies(1,i)* ...
+        design_geometric_central_radial_frequency)^2/ ...
+        ((band_pass_poles_radial_frequencies(1,i)^2- ...
+        design_geometric_central_radial_frequency^2)^2+ ...
+        ((band_pass_poles_radial_frequencies(1,i)/band_pass_poles_Q(1,i))^2* ...
+        design_geometric_central_radial_frequency^2)));
+    units_alpha(1,i) = 1/units_filter_central_frequency_gain(1,i);
     
     % Calculates the values of the resistors used to diminish the entry
     % using the eq. 7-90 (to include the scaling already done the equations
@@ -355,12 +366,24 @@ for i=1:band_pass_number_of_poles
         band_pass_poles_radial_frequencies(1,i)^2];
     %}
     unit_transfer_function(i) = tf(unit_numerator, unit_denominator);
+    
+    [units_filter_central_frequency_gain(1,i),phase] = ...
+        bode(unit_transfer_function(i), ...
+        design_geometric_central_radial_frequency);
 end
 
+%{
+total_gain = units_filter_central_frequency_gain(1,1)* ...
+    units_filter_central_frequency_gain(1,2)* ...
+    units_filter_central_frequency_gain(1,3)* ...
+    units_filter_central_frequency_gain(1,4);
+%}
+
 total_transfer_function = series(series(series( ...
     unit_transfer_function(1), unit_transfer_function(2)), ...
     unit_transfer_function(3)), unit_transfer_function(4));
-%total_transfer_function = total_transfer_function*38.2;
+
+%total_transfer_function = total_transfer_function*(1/total_gain);
 
 %plot_transfer_function(unit_transfer_function(2), [1 10]);
 %ltiview(unit_transfer_function(1), unit_transfer_function(2), ...
@@ -368,15 +391,15 @@ total_transfer_function = series(series(series( ...
 
 %ltiview(total_transfer_function);
 
-%{
+%
 plot_transfer_function(total_transfer_function, ...
-    [specification_central_frequency ...
+    [specification_low_stop_frequency ...
-    941.83 ...
-    specification_low_stop_frequency ...
     specification_low_pass_frequency ...
+    specification_central_frequency ...
+    941.83 ...
     specification_high_pass_frequency ...
     specification_high_stop_frequency]);
-%}
+%
 
 % Clears unneeded variables from workspace
 clearVars = {'units_central_frequency_gain', 'i', 'units_alpha', ...