diff --git a/.DS_Store b/.DS_Store
deleted file mode 100644
index 797d900..0000000
Binary files a/.DS_Store and /dev/null differ
diff --git a/Code/chanvocoder_execution.m b/Code/chanvocoder_execution.m
index 0dcb644..b550db4 100644
--- a/Code/chanvocoder_execution.m
+++ b/Code/chanvocoder_execution.m
@@ -1,5 +1,5 @@
 modfile = 'Sound/modulator22.wav';
-carfile = 'Sound/carrier22.wav';
+carfile = 'Sound/white.wav';
 outfile = 'Sound/vocodedsound.wav';
 
 [modul, sr1] = audioread(modfile);
@@ -12,3 +12,34 @@ end
 y = chanvocoder(carrier, modul, 512, 16, 0.2);
 audiowrite(outfile, y, sr1);
 
+% Plot temporal variations of modulator, carrier, and output signals
+t_mod = (0:length(modul)-1) / sr1;
+t_car = (0:length(carrier)-1) / sr1;
+t_out = (0:length(y)-1) / sr1;
+
+figure;
+subplot(3,1,1);
+plot(t_mod, modul);
+title('Modulator Signal');
+xlabel('Time (s)');
+ylabel('Amplitude');
+
+subplot(3,1,2);
+plot(t_car, carrier);
+title('Carrier Signal');
+xlabel('Time (s)');
+ylabel('Amplitude');
+
+subplot(3,1,3);
+plot(t_out, y);
+title('Output Signal');
+xlabel('Time (s)');
+ylabel('Amplitude');
+
+% Compute spectrogram of modulator, carrier, and output signals
+spectrogram(modul, sr1, 5, 30);
+
+spectrogram(carrier, sr1, 5, 30);
+
+spectrogram(y, sr1, 5, 30);
+
diff --git a/Code/speech_analysis_complete_sampling_part.m b/Code/speech_analysis_complete_sampling_part.m
index 2087418..71e1ca7 100644
--- a/Code/speech_analysis_complete_sampling_part.m
+++ b/Code/speech_analysis_complete_sampling_part.m
@@ -70,8 +70,11 @@ cutoff_freq_iir = 1000; % in Hz
 [b, a] = butter(iir_order, cutoff_freq_iir / (Fs/2), 'low');
 
 % Check IIR filter stability
+poles = roots(a); % Compute poles
 iir_stable = all(abs(roots(a)) < 1);  % Check if all poles are inside the unit circle
 fprintf('IIR filter stability: %d\n', iir_stable);
+fprintf('Poles of the IIR filter: ');
+disp(poles');
 
 % Apply IIR filter to the original signal
 filtered_signal_iir = filter(b, a, signal);
@@ -185,6 +188,6 @@ ylabel('Amplitude');
 title('IIR Filtered Signal (Downsampled)');
 
 % Write downsampled signals to audio files
-audiowrite('downsampled_signal1.wav', downsampled_filtered_signal_fir, 4000);
-audiowrite('downsampled_signal2.wav', downsampled_filtered_signal_iir, 4000);
+audiowrite('downsampled_signal1_fir.wav', downsampled_filtered_signal_fir, 4000);
+audiowrite('downsampled_signal2_iir.wav', downsampled_filtered_signal_iir, 4000);
 
diff --git a/Sound/downsampled_signal1_fir.wav b/Sound/downsampled_signal1_fir.wav
new file mode 100644
index 0000000..e186802
Binary files /dev/null and b/Sound/downsampled_signal1_fir.wav differ
diff --git a/Sound/downsampled_signal2.wav b/Sound/downsampled_signal2.wav
index 6dfbcb4..ffd4e55 100644
Binary files a/Sound/downsampled_signal2.wav and b/Sound/downsampled_signal2.wav differ
diff --git a/Sound/downsampled_signal2_iir.wav b/Sound/downsampled_signal2_iir.wav
new file mode 100644
index 0000000..6dfbcb4
Binary files /dev/null and b/Sound/downsampled_signal2_iir.wav differ
diff --git a/Sound/vocodedsound.wav b/Sound/vocodedsound.wav
index fd619ff..748c837 100644
Binary files a/Sound/vocodedsound.wav and b/Sound/vocodedsound.wav differ