That assignment had 2 part. I already complated part 1. and collected the phasor frequency and magnitude datas. My code is here: I need to write a new code to answer those question. Please help me i dont know how to do those. Many thanks. You can find .wav file from this website any .wav file will be okay.http://www.grsites.com/archive/sounds/category/10/ HERE IS MY PART 1 OF THIS ASSIGNMENT CODE. clc clear all [y, Fs] = audioread(\'chirp.wav\'); % Reading file Fs = 8192; % Sampling frequency N=length(y); T=1/Fs; Fmax=Fs/2; T0=N*T; %duration of the signal. t =[1/Fs:1/Fs:N/Fs] % Time Vector sound(y,Fs); % Plays .wav file hold on subplot(3,1,1); plot(t,y, \'c\'); % Plots input signal xlabel(\'Time\'); ylabel(\'Amplitude\'); title(\'Input Signal\') Xr=fft(y); %use FFT to find DFT freq1 =[-Fmax:Fs/N:Fmax-(Fs/N)]; %freq1 = linspace(1,Fs,length(y)); %%%frequency vector subplot(3,1,2); a=fftshift(Xr); c=abs(a); plot(freq1, c, \'r\'); %%%Stem Plot xlabel(\'Freq\'); ylabel(\'Amplitude\'); title(\'Fourier Transform (Magnitude)\'); Xr_phase=angle(a); %Calculation of %phase subplot(3,1,3); plot(freq1,Xr_phase,\'g\') %Use %fftshift to %shift zero frequency component xlabel(\'Phase\'); ylabel(\'Frequency\'); title(\'Phase Plot\'); %%% saving text file in ASCII foramt%% % 1st column- frequency%% % 2nd column- magnitude components%% % 3rd column- phase (deg) components%% A(:,1)=freq1; A(:,2)=c; A(:,3)=Xr_phase; save(\'parameters.txt\',\'A\', \'-ASCII\') THIS PART HAS BEEN COMPLETED NO NEED TO RE DO IT AGAIN. ITS CODE IS IN THE ABOVE. This picture is only information purposes to understand part 2 of the assignment. Signal Synthesizer (part-2) 1. Read the analyzed value (magnitude, phase and frequency) from ASCII files. 2. Re-create sinusoid using the following equation for each set of (magnitude, phase and frequency) A Cos (2nft G) 3. Combine all sinusoids and plot the signal (this is regenerated signal). 4. Compare this combined signal with original chirp signal 5. Play the regenerated signal (It should sound like the original audio signal). 6. Store the synthesized audio signal in a WAV file (name it chirp synthesized.wav). Solution freq2=A(:,1)\'%freq Components; c2=A(:,2)\';%magnitude components Xr_phase2=A(:,3)\'; %phase (deg) components%%; for i=1:1:length(c2) signalA(i)=c2(i)*cos((2*pi*freq2(i)*t(i))+Xr_phase2(i)); end figure(2) plot(t,signalA); sound(signalA,Fs);.

1. That assignment had 2 part. I already complated part 1. and collected the phasor frequency and
magnitude datas. My code is here: I need to write a new code to answer those question. Please
help me i dont know how to do those. Many thanks.
You can find .wav file from this website any .wav file will be
okay.http://www.grsites.com/archive/sounds/category/10/
HERE IS MY PART 1 OF THIS ASSIGNMENT CODE.
clc
clear all
[y, Fs] = audioread('chirp.wav'); % Reading file
Fs = 8192; % Sampling frequency
N=length(y);
T=1/Fs;
Fmax=Fs/2;
T0=N*T; %duration of the signal.
t =[1/Fs:1/Fs:N/Fs] % Time Vector
sound(y,Fs); % Plays .wav file
hold on
subplot(3,1,1);
plot(t,y, 'c'); % Plots input signal
xlabel('Time');
ylabel('Amplitude');
title('Input Signal')
Xr=fft(y); %use FFT to find DFT
freq1 =[-Fmax:Fs/N:Fmax-(Fs/N)];
%freq1 = linspace(1,Fs,length(y)); %%%frequency vector
subplot(3,1,2);
a=fftshift(Xr);
c=abs(a);
plot(freq1, c, 'r'); %%%Stem Plot
xlabel('Freq');
ylabel('Amplitude');
title('Fourier Transform (Magnitude)');
Xr_phase=angle(a); %Calculation of %phase
subplot(3,1,3);
plot(freq1,Xr_phase,'g') %Use %fftshift to %shift zero frequency component

2. xlabel('Phase');
ylabel('Frequency');
title('Phase Plot');
%%% saving text file in ASCII foramt%%
% 1st column- frequency%%
% 2nd column- magnitude components%%
% 3rd column- phase (deg) components%%
A(:,1)=freq1;
A(:,2)=c;
A(:,3)=Xr_phase;
save('parameters.txt','A', '-ASCII')
THIS PART HAS BEEN COMPLETED NO NEED TO RE DO IT AGAIN. ITS CODE IS IN
THE ABOVE. This picture is only information purposes to understand part 2 of the assignment.
Signal Synthesizer (part-2) 1. Read the analyzed value (magnitude, phase and frequency) from
ASCII files. 2. Re-create sinusoid using the following equation for each set of (magnitude, phase
and frequency) A Cos (2nft G) 3. Combine all sinusoids and plot the signal (this is regenerated
signal). 4. Compare this combined signal with original chirp signal 5. Play the regenerated signal
(It should sound like the original audio signal). 6. Store the synthesized audio signal in a WAV
file (name it chirp synthesized.wav).
Solution
freq2=A(:,1)'%freq Components;
c2=A(:,2)';%magnitude components
Xr_phase2=A(:,3)'; %phase (deg) components%%;
for i=1:1:length(c2)
signalA(i)=c2(i)*cos((2*pi*freq2(i)*t(i))+Xr_phase2(i));
end
figure(2)
plot(t,signalA);
sound(signalA,Fs);