hey i am new to matlab , actually i want to fft analysis of honey bee sound wav files . i have done with single file now i want to read and plot all files in folder

clc

clear

file1='ch01_day05_2a3';

[y,fs] = audioread('C:\Users\Muhammad Yasir\Downloads\Compressed\project matlab\ch01\ch01_day05_2a3.wav');

L=length(y);

t=(1000*(0:1/fs:(L-1)/fs))';

n = 2^nextpow2(L);

Y=fft(y,n);

P = abs(Y/n);

P = P(1:n/2+1);

P(2:end-1) = 2*P(2:end-1);

power = abs(Y).^2/n; % power of the DFT

power = power(1:n/2+1);

power(2:end-1) = 2*power(2:end-1);

f = fs*(0:(n/2))/n;

f1 = fs*(0:n-1)/n;

figure

subplot(4,1,1)

plot(t,y)

xlabel('Time in mseconds');

ylabel('Audio Level');

title('Plot of bee audio files ');

grid on

grid minor

subplot(4,1,2)

plot(f,P)

title('Single-Sided Magnitude Spectrum of bee audio ')

xlabel('f (Hz)')

ylabel('Magnitude')

grid on

grid minor

subplot(4,1,3)

[pk,j] = findpeaks(P,'SortStr','descend','NPeaks',8);

Peaks(:,j) = f(j);

xx=(f(:,j));

xx=(sort(xx));

[~,loc] = max(P);

plot(f(1:10*loc),P(1:10*loc),f(j),pk,'o')

title(['The maixmum of Magnitude Spectrum occurs at ( ' ,num2str(xx) , ' ) Hz' ])

xlabel('f (Hz)')

ylabel('Magnitude')

grid on

grid minor

subplot(4,1,4)

plot(f,power)

xlabel('Frequency')

ylabel('Power')

Answer 1

[Yasir Muhammad]

this worked for me

clc

clear

D = 'C:\Users\Muhammad Yasir\Downloads\Compressed\project matlab\ch08';

S = dir(fullfile(D,'*.wav'));

N = numel(S);

y = cell(1,N);

fs = cell(1,N);

for k = 1:N

F = fullfile(D,S(k).name);

[y{k},fs{k}] = audioread(F);

L=length(y{k});

t=(1000*(0:1/fs{k}:(L-1)/fs{k}));

n = 2^nextpow2(L);

Y=fft(y{k},n);

P = abs(Y/n);

P = P(1:n/2+1);

P(2:end-1) = 2*P(2:end-1);

power = abs(Y).^2/n; % power of the DFT

power = power(1:n/2+1);

power(2:end-1) = 2*power(2:end-1);

f = fs{k}*(0:(n/2))/n;

f1 = fs{k}*(0:n-1)/n;

figure

subplot(4,1,1)

plot(t,y{k})

xlabel('Time in mseconds');

ylabel('Audio Level');

title('Plot of bee audio files ');

grid on

grid minor

subplot(4,1,2)

plot(f,P)

title('Single-Sided Magnitude Spectrum of bee audio ')

xlabel('f (Hz)')

ylabel('Magnitude')

grid on

grid minor

subplot(4,1,3)

[pk,j] = findpeaks(P,'SortStr','descend','NPeaks',8);

Peaks(:,j) = f(j);

xx=(f(:,j));

xx=(sort(xx));

[~,loc] = max(P);

plot(f(1:10*loc),P(1:10*loc),f(j),pk,'o')

title(['The maixmum of Magnitude Spectrum occurs at ( ' ,num2str(xx) , ' ) Hz' ])

xlabel('f (Hz)')

ylabel('Magnitude')

name = sprintf('figure_%d.jpg',k);

% Specify some particular, specific folder:

path = fullfile('C:\Users\Muhammad Yasir\Desktop\ch08\', name);

saveas(gcf,path,'png')

end

% Your destination folder

Answer 2

[KALYAN ACHARJYA]

A lot of similar question answers are available in MATLAB Answers (replace images files with wav), Like here

https://www.mathworks.com/matlabcentral/answers/393578-how-to-read-input-images-from-the-folder-sequentially#answer_332825

https://www.mathworks.com/matlabcentral/answers/480448-read-and-analyse-multiple-wav-files

for
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plot(data);
hold on;
end