MATLAB: Help me pls about the homework

homework

Firtly, sorry for my bad english. I want to write a program that has 20 seconds sound (called x) and program will choose 1 sec a part of sound randomly (called y) and will say us this 1 sec part is which part of sound. How can i write this fuction related to x and y ? Then we will add a noise to y. what is the differences between with noise and without noise? Thanks!

Best Answer

Here's a start:

% Read in standard MATLAB demo sound:
filename = 'guitartune.wav';
[y,Fs] = audioread(filename,'native');
whos y
% Find starting point for the 1 second chunk.
randomStartingIndex = randi(length(y) - Fs)
% Extract a 1 second chunk.
yExtracted = y(........
% Add noise to that chunk:
yNoisy = yExtracted + amplitude * rand(......
% Play the sound:
sound(yNoisy);

I trust you can finish it.

Related Solutions

MATLAB: How to increase the length of an audio file with random white noise

Use the semicolon operator. For a mono signal

[y, Fs] = audioread('guitartune.wav');
% Crop to 1 second
y = y(1:Fs);
% soundsc(y, Fs);
% Make noise
noiseSignal = rand(length(y), 1);
% Concatenate noise.
outputSignal = [y; noiseSignal];
% Play the sound
soundsc(outputSignal, Fs);

MATLAB: I have a wav file and I want to play it….how

Try soundsc(). Here's one way to add white noise:

% Read in the standard demo wave file that ships with MATLAB.
[y, fs] = audioread('guitartune.wav');
soundsc(y, fs);  % Here is where we actually play the music from the speakers.

% Plot the original waveform.
subplot(2, 1, 1);
plot(y, 'b-');
grid on;
drawnow;
% Give it time for it to finish playing the original tune
% while asking user if they want to play the noisy one.
message = sprintf('Do you want to play the noisy one?');
reply = questdlg(message, 'Play tune?', 'Yes', 'No', 'Yes');
if strcmpi(reply, 'No')
  % User said No, so exit.
  return;
end
% Define the noise amplitude.  Change this to increate or decrease the noise.
noiseAmplitude = 0.1;
% Add noise to every element of the sound waveform.
yNoisy = y + noiseAmplitude * rand(length(y), 1) - noiseAmplitude/2;
% Plot the noisy waveform below the original one.
subplot(2, 1, 2);
plot(y, 'b-');
grid on;
drawnow;
% Here is where we actually play the music from the speakers.
soundsc(yNoisy, fs);

Best Answer

Related Solutions

MATLAB: How to increase the length of an audio file with random white noise

MATLAB: I have a wav file and I want to play it….how

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