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ex_Sharpness_DIN45692.m
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ex_Sharpness_DIN45692.m
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% Script ex_Sharpness_DIN45692
%
% Example: compute stationary and time-varying Sharpness (DIN 45692) from input signal
%
% FUNCTION:
% OUT = Sharpness_DIN45692(insig, fs, weight_type, LoudnessField, LoudnessMethod, time_skip, show_sharpness, show_loudness)
% type <help Sharpness_DIN45692> for more info
%
% test signal: narrow band noise with a center frequency of 1kHz,
% a bandwidth of 160 Hz (920 Hz to 1080 Hz) and an overall level of 60 dB
% should yield a sharpness value of 1 acum
%
% Author: Gil Felix Greco, Braunschweig 28.02.2023
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
clc; clear all; close all;
%% load test signal
dir_ref_sounds = [basepath_SQAT 'sound_files' filesep 'reference_signals' filesep];
[TestSignal,fs]=audioread([dir_ref_sounds 'RefSignal_Sharpness_DIN45692.wav']); % 'sound_files\reference_signals\' - path of the sound file for reference
lvl_cal_signal = 60; % information from the file name...
dBFS_in = lvl_cal_signal-20*log10(rms(TestSignal)); % difference between target and actual full-scale value
dBFS_out = 94; % dB full scale convention in SQAT: amplitude of 1 = 1 Pa, or 94 dB SPL
dB_correction = dBFS_in - dBFS_out;
insig_cal = TestSignal * 10^(dB_correction/20);
%% sharpness (stationary) calculation using SQAT
S_stationary = Sharpness_DIN45692(insig_cal, fs,... % input signal and sampling frequency
'DIN45692',... % Weight_Type, type of weighting function used for sharpness calculation
0,... % field used for loudness calculation; free field = 0; diffuse field = 1;
1,... % method used for loudness calculation: stationary (from input 1/3 octave unweighted SPL)=0; stationary = 1; time varying = 2;
0,... % time_skip (second) for statistics calculation
0,... % show sharpness results
0); % show loudness results
% display result
fprintf('\nCalculation of reference signal (60 dBSPL at 1kHz) based on a stationary loudness\n');
fprintf('\tcalculation yields a sharpness value of %g (acum) using the DIN45692 weighting function\n',S_stationary.Sharpness);
%% sharpness (time-varying) calculation using SQAT
S_time_varying = Sharpness_DIN45692(insig_cal, fs,... % input signal and sampling frequency
'DIN45692',... % Weight_Type, type of weighting function used for sharpness calculation
0,... % field used for loudness calculation; free field = 0; diffuse field = 1;
2,... % method used for loudness calculation: stationary (from input 1/3 octave unweighted SPL)=0; stationary = 1; time varying = 2;
0.5,... % time_skip (second) for statistics calculation
0,... % show sharpness results
0); % show loudness results
% display result
fprintf('\n Calculation of reference signal (60 dBSPL at 1kHz) based on a time-varying loudness\n');
fprintf('\t calculation yields a mean sharpness value over time of %g (acum) using the DIN45692\n',S_time_varying.Smean);
fprintf('\t weighting function.\n');
%% sharpness (time-varying) calculation using SQAT - compare results obtained using different weighting functions
S_time_varying_bismarck = Sharpness_DIN45692(insig_cal, fs,... % input signal and sampling frequency
'bismarck',... % Weight_Type, type of weighting function used for sharpness calculation
0,... % field used for loudness calculation; free field = 0; diffuse field = 1;
2,... % method used for loudness calculation: stationary (from input 1/3 octave unweighted SPL)=0; stationary = 1; time varying = 2;
0.5,... % time_skip (second) for statistics calculation
0,... % show sharpness results
0); % show loudness results
S_time_varying_aures = Sharpness_DIN45692(insig_cal, fs,... % input signal and sampling frequency
'aures',... % Weight_Type, type of weighting function used for sharpness calculation
0,... % field used for loudness calculation; free field = 0; diffuse field = 1;
2,... % method used for loudness calculation: stationary (from input 1/3 octave unweighted SPL)=0; stationary = 1; time varying = 2;
0.5,... % time_skip (second) for statistics calculation
0,... % show sharpness results
0); % show loudness results
%% plot sharpness (time-varying) calculation using SQAT - compare results obtained using different weighting functions
figure('NAME','Sharpness analysis (comparison of weighting functions)');
plot(S_time_varying.time,S_time_varying.InstantaneousSharpness,'k','Linewidth',2); hold on;
plot(S_time_varying_bismarck.time,S_time_varying_bismarck.InstantaneousSharpness,'c--','Linewidth',1.5);
plot(S_time_varying_aures.time,S_time_varying_aures.InstantaneousSharpness,'r','Linewidth',1.5);
xlabel('Time, $t$ (s)','Interpreter','Latex');
ylabel('Sharpness, $S$ (acum)','Interpreter','Latex');
ylim([0.9 1.1]);
legend('DIN45692','von Bismarck','Aures','Location','best','Interpreter','Latex');
legend boxoff
set(gcf,'color','w')