bugfix for new HIIC rating

applications/RoomAcoustics/BuildingAcoustics/ita_soundInsulationIndexImpact.m

 function varargout = ita_soundInsulationIndexImpact(varargin)
-% ita_soundInsulationIndexAirborne - sound insulation acc. to ISO 717-2 or ASTM E989
+% ita_soundInsulationIndexAirborne - impact sound ratings acc. to ISO 717-2 or ASTM E989/E3222
 
 % <ITA-Toolbox>
 % This file is part of the application BuildingAcoustics for the ITA-Toolbox. All rights reserved.
@@ -37,8 +37,9 @@ elseif strcmpi(sArgs.type,'astm') % Reference curve and frequencies according to
     freq = [100,125,160,200,250,315,400,500,630,800,1000,1250,1600,2000,2500,3150].';
     refCurve = [2 2 2 2 2 2 1 0 -1 -2 -3 -6 -9 -12 -15 -18].';
     refSurf = 32;
-    % for high-frequency rating
-    refCurveIIC = refCurve(7:end);
+    % for high-frequency rating according to ASTM E3222
+    roundingFactorHIIC = 0.1;
+    refCurveHIIC = refCurve(7:end);
     refSurfHIIC = 20;
 else
     error([upper(mfilename) ':wrong input for type']);
@@ -80,14 +81,14 @@ deficiencies.allowDBPlot = false;
 % different procedure for ASTM
 if strcmpi(sArgs.type,'astm')
     impactInsulationClass = 110 - impactInsulationClass;
-    % high-frequency rating
-    NISPL_HIIC = NISPL(7:end);
+    % high-frequency rating according to ASTM E3222
+    NISPL_HIIC = round(20.*log10(interp1(freqVector,data.freqData(:,1),freq(7:end),'spline','extrap')) + 93.98,-log10(roundingFactorHIIC));
     counter = 0;
-    impactInsulationClassH = max(ceil(NISPL_HIIC-refCurveIIC));
-    deltaHIIC = max(0,NISPL_HIIC - (refCurveIIC + impactInsulationClassH));
+    impactInsulationClassH = max(ceil(NISPL_HIIC - refCurveHIIC));
+    deltaHIIC = max(0,NISPL_HIIC - (refCurveHIIC + impactInsulationClassH));
     while sum(deltaHIIC) <= refSurfHIIC && counter < 1e3
         impactInsulationClassH = impactInsulationClassH - dbStep;
-        deltaHIIC = max(0,NISPL_HIIC - (refCurveIIC + impactInsulationClassH));
+        deltaHIIC = max(0,NISPL_HIIC - (refCurveHIIC + impactInsulationClassH));
         counter = counter+1;
     end
     impactInsulationClassH = impactInsulationClassH + dbStep;