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Lab_2_Speech_Processing
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Uncommented version with filtering IIR and FIR

This commit is contained in:
Mattis ROELLINGER 2024-03-28 12:02:55 +01:00
parent 8f89d076e6
commit aaec5b54fa
5 changed files with 77 additions and 5 deletions
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0
modulator22.wav → data/modulator22.wav
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data/modulator22_decimate.wav Normal file
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data/modulator22_downsample.wav Normal file
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modulator22_speedown.wav → data/modulator22_speedown.wav
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speech_analysis.m
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@ -2,7 +2,7 @@ pkg load signal
clear all
close all
[y,fs]=audioread('modulator22.wav');
[y,fs]=audioread('./data/modulator22.wav');
t=0:1/fs:length(y)/fs-1/fs;
@ -12,9 +12,8 @@ t=0:1/fs:length(y)/fs-1/fs;
##xlabel('time(s)');
##ylabel('amplitude(n.u.');
audiowrite('modulator22_speedown.wav', y , fs/2);
[y_speedown,fs_speedown]=audioread('modulator22_speedown.wav');
audiowrite('./data/modulator22_speedown.wav', y , fs/2);
[y_speedown,fs_speedown]=audioread('./data/modulator22_speedown.wav');
t_speedown=0:1/fs_speedown:length(y_speedown)/fs_speedown-1/fs_speedown;
##figure;
@ -28,3 +27,76 @@ t_speedown=0:1/fs_speedown:length(y_speedown)/fs_speedown-1/fs_speedown;
%spectrogram(y_speedown, fs_speedown, 5, 30);
%spectrogram(y_speedown, fs_speedown, 5, 5);
##y_downsampled = downsample(y, 2);
##fs_downsample = fs/2;
##audiowrite('./data/modulator22_downsample.wav', y_downsampled , fs_downsample);
##t_downsample=0:1/fs_downsample:length(y_downsampled)/fs_downsample-1/fs_downsample;
##y_decimated = decimate(y, 2);
##fs_decimate = fs/2;
##audiowrite('./data/modulator22_decimate.wav', y_decimated , fs_decimate);
##t_decimate=0:1/fs_decimate:length(y_decimated)/fs_decimate-1/fs_decimate;
##
##figure;
##set(gcf, 'name','Decimate vs Downsample');
##title('Decimate vs Downsample');
##plot(t_downsample,y_downsampled,'b');
##hold on;
##plot(t_decimate,y_decimated,'g');
##xlabel('time(s)');
##ylabel('amplitude(n.u)');
##legend('downsample()','decimate()',"location","southeastoutside");
##
##frequencySpectrum(y_decimated, fs_decimate, true);
##frequencySpectrum(y_downsampled, fs_downsample, true);
%%%FILTER IMPLEMENTATION %%%%
%creating a low pass filter FIR
N=30;
fc=1000;
bfir=fir1(N,fc/(fs/2));
freqz(bfir,1);
%filter the signal
y_FIR_filter=filter(bfir,1,y);
%plot of the signal FIR
##figure;
##plot(y_FIR_filter,'g');
%creating a low pass filter IIR
N=8;
fc=1000;
[biir,a]=butter(N,fc/(fs/2));
freqz(biir,a);
Z=roots(biir); %zeros of the transfer fct
P=roots(a); %poles fo the transfer fct
%representation of zeros/poles in complex plan
##figure;
##zplane(Z,P);
##title('Zeros and poles of the transfer function of the IIR filter');
##legend('zeros','poles');
##grid on;
%filter the signal
y_IIR_filter=filter(biir,a,y);
%plot of the signal IIR
##figure;
##plot(y_IIR_filter,'b');
%downsample of the IIR signal
y_IIR_downsample = downsample(y_downsampled, 2);
fs_IIR_downsample = fs/2;
t_IIR_downsample=0:1/fs_IIR_downsample:length(y_IIR_downsample)/fs_IIR_downsample-1/fs_IIR_downsample;
figure;
set(gcf, 'name','Downsample of IIR');
plot(t_IIR_downsample,y_IIR_downsample,'b');
xlabel('time(s)');
ylabel('amplitude(n.u)');
legend('downsample()',"location","southeastoutside");