From c35d3d302ad2c36a0518f3de247acaa80b71ee55 Mon Sep 17 00:00:00 2001
From: Markus Mueller-Trapet <markus.mueller-trapet@rwth-aachen.de>
Date: Fri, 23 Jun 2017 15:12:23 -0400
Subject: [PATCH] added spectrum adaptation terms from ISO 717-1
---
.../ita_soundInsulationIndexAirborne.m | 63 ++++++++++++-------
1 file changed, 41 insertions(+), 22 deletions(-)
diff --git a/applications/RoomAcoustics/BuildingAcoustics/ita_soundInsulationIndexAirborne.m b/applications/RoomAcoustics/BuildingAcoustics/ita_soundInsulationIndexAirborne.m
index 93273055..427c8a4a 100644
--- a/applications/RoomAcoustics/BuildingAcoustics/ita_soundInsulationIndexAirborne.m
+++ b/applications/RoomAcoustics/BuildingAcoustics/ita_soundInsulationIndexAirborne.m
@@ -13,17 +13,21 @@ sArgs = struct('pos1_data','anything','bandsperoctave',3,'freqVector',[],'create
%% reference curves
if strcmpi(sArgs.type,'iso') % Reference curve and frequencies according to ISO 717-1
- outputStr = 'R_W';
+ outputStr = 'R_w (C; C_{tr})';
roundingFactor = 0.1;
deficiencyLimit = Inf;
if sArgs.bandsperoctave == 1
- refCurve = [36 45 52 55 56]-52;
freq = [125 250 500 1000 2000];
refSurf = 10;
+ refCurve = [36 45 52 55 56].'-52;
+ Ccurve = [-21 -14 -8 -5 -4].';
+ Ctrcurve = [-14 -10 -7 -4 -6].';
elseif sArgs.bandsperoctave == 3
- freq = [100,125,160,200,250,315,400,500,630,800,1000,1250,1600,2000,2500,3150];
- refCurve = [33 36 39 42 45 48 51 52 53 54 55 56 56 56 56 56]-52;
+ freq = [100,125,160,200,250,315,400,500,630,800,1000,1250,1600,2000,2500,3150].';
refSurf = 32;
+ refCurve = [33 36 39 42 45 48 51 52 53 54 55 56 56 56 56 56].'-52;
+ Ccurve = [-29 -26 -23 -21 -19 -17 -15 -13 -12 -11 -10 -9 -9 -9 -9 -9].';
+ Ctrcurve = [-20 -20 -18 -16 -15 -14 -13 -12 -11 -9 -8 -9 -10 -11 -13 -15].';
else
error([upper(mfilename) ':wrong input for bandsperoctave']);
end
@@ -32,14 +36,12 @@ elseif strcmpi(sArgs.type,'astm') % Reference curve and frequencies according to
roundingFactor = 1;
deficiencyLimit = 8;
sArgs.bandsperoctave = 3;
- freq = [125,160,200,250,315,400,500,630,800,1000,1250,1600,2000,2500,3150,4000];
- refCurve = [-16 -13 -10 -7 -4 -1 0 1 2 3 4 4 4 4 4 4];
+ freq = [125,160,200,250,315,400,500,630,800,1000,1250,1600,2000,2500,3150,4000].';
+ refCurve = [-16 -13 -10 -7 -4 -1 0 1 2 3 4 4 4 4 4 4].';
refSurf = 32;
else
error([upper(mfilename) ':wrong input for type']);
end
-freq = freq(:);
-refCurve = refCurve(:);
dbStep = 1;
%% prepare data
@@ -52,45 +54,62 @@ if ~isa(data,'itaSuper')
end
end
freqVector = data.freqVector;
-soundInsulation = 20.*log10(interp1(freqVector,data.freqData(:,1),freq,'spline','extrap'));
+soundReduction = 20.*log10(interp1(freqVector,data.freqData(:,1),freq,'spline','extrap'));
if min(freqVector) > freq(1) || max(freqVector) < freq(end)
warning([upper(mfilename) ': Sound insulation data will be extrapolated']);
end
%% sound insulation index
-soundInsulation = round(soundInsulation/roundingFactor)*roundingFactor;
-soundInsulationIndex = min(floor(soundInsulation-refCurve));
-delta = max(0,refCurve + soundInsulationIndex - soundInsulation);
+soundReduction = round(soundReduction/roundingFactor)*roundingFactor;
+soundReductionIndex = min(floor(soundReduction-refCurve));
+delta = max(0,refCurve + soundReductionIndex - soundReduction);
counter = 0; % stopping criterion
% shift reference curve until limits are reached
while sum(delta) < refSurf && all(delta <= deficiencyLimit) && counter < 1e3
- soundInsulationIndex = soundInsulationIndex + dbStep;
- delta = max(0,refCurve + soundInsulationIndex - soundInsulation);
+ soundReductionIndex = soundReductionIndex + dbStep;
+ delta = max(0,refCurve + soundReductionIndex - soundReduction);
counter = counter+1;
end
-soundInsulationIndex = soundInsulationIndex - dbStep;
-delta = max(0,refCurve + soundInsulationIndex - soundInsulation);
+soundReductionIndex = soundReductionIndex - dbStep;
+delta = max(0,refCurve + soundReductionIndex - soundReduction);
deficiencies = itaResult(delta,freq,'freq')*itaValue(1,'dB');
deficiencies.allowDBPlot = false;
+%% adaptation terms for ISO
+if strcmpi(sArgs.type,'iso')
+ C = round(-10.*log10(sum(10.^((Ccurve - soundReduction)./10),1)) - soundReductionIndex);
+ Ctr = round(-10.*log10(sum(10.^((Ctrcurve - soundReduction)./10),1)) - soundReductionIndex);
+else
+ C = 0;
+ Ctr = 0;
+end
+
%% output
if sArgs.createPlot
fgh = ita_plot_freq(data);
- plotResult = itaResult([10.^((refCurve+soundInsulationIndex)./20), [ones(sum(freq<=500),1)*10.^(soundInsulationIndex./20); nan(sum(freq>500),1)]],freq,'freq');
+ plotResult = itaResult([10.^((refCurve+soundReductionIndex)./20), [ones(sum(freq<=500),1)*10.^(soundReductionIndex./20); nan(sum(freq>500),1)]],freq,'freq');
ita_plot_freq(plotResult,'figure_handle',fgh,'axes_handle',gca,'hold');
bar(gca,deficiencies.freqVector,deficiencies.freq,'hist');
[maxDef,maxIdx] = max(deficiencies.freq);
- legend({'Sound transmission loss','Shifted reference curve',[outputStr ' = ' num2str(soundInsulationIndex) 'dB'],['Deficiencies (sum: ' num2str(sum(deficiencies.freq)) 'dB, max: ' num2str(maxDef) 'dB at ' num2str(deficiencies.freqVector(maxIdx)) 'Hz)']});
- ylim([0 max(max(soundInsulation),max(refCurve)+soundInsulationIndex)+15]);
+ if strcmpi(sArgs.type,'iso')
+ singleNumberString = [outputStr ' = ' num2str(soundReductionIndex) ' (' num2str(C) '; ' num2str(Ctr) ') dB'];
+ else
+ singleNumberString = [outputStr ' = ' num2str(soundReductionIndex) 'dB'];
+ end
+ legend({'Sound transmission loss','Shifted reference curve',singleNumberString,['Deficiencies (sum: ' num2str(sum(deficiencies.freq)) 'dB, max: ' num2str(maxDef) 'dB at ' num2str(deficiencies.freqVector(maxIdx)) 'Hz)']});
+ ylim([0 max(max(soundReduction),max(refCurve)+soundReductionIndex)+15]);
end
-varargout{1} = soundInsulationIndex;
+varargout{1} = soundReductionIndex;
% reference curve specified at the freqVector specified by the input itaResult:
if nargout >= 2
- varargout{2} = interp1(freq, 10.^((refCurve+soundInsulationIndex)./20), freqVector, 'linear');
- if nargout == 3
+ varargout{2} = interp1(freq, 10.^((refCurve+soundReductionIndex)./20), freqVector, 'linear');
+ if nargout >= 3
varargout{3} = deficiencies;
+ if nargout >= 4
+ varargout{4} = [C,Ctr];
+ end
end
end
--
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