Can someone help me with a project?

I'm fairly new to MatLab and I'm working on a final project for my college class. The project is open-ended as to what I can do. I'm attempting to create either an audio file or a .jpg file based off of data that I've derived from a block of text. Any ideas on how I should procede would be very helpful! I used a very rudimentary process to gather the data from the text so if anyone has some advice for that it would also be very appreciated!

Thank you

Answer 1

[Sean de Wolski]

In order to avoid reinventing the wheel, I would search the FEX

On a quick search, this looks relevant.

Answer 2

[Image Analyst]

Here's a demo I wrote to create a wave file from mathematical parameters. Perhaps you could adapt it so that the amplitude, decay, envelope, etc. depend on the ASCII values of the text.

% Program to create a wave file with variable amplitude and pitch.

% Initialization / clean-up code.
clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
clear;  % Erase all existing variables. Or clearvars if you want.
workspace;  % Make sure the workspace panel is showing.
format long g;
format compact;
fontSize = 20;

% Create the filename where we will save the waveform.
folder = pwd;
baseFileName = 'Test_Wave.wav';
fullFileName = fullfile(folder, baseFileName);
fprintf('Full File Name = %s\n', fullFileName);

% Set up the time axis:
t = 1:15000;

% Set up the period (pitch, frequency):
T = 13;
T = linspace(25, 8, length(t)); % Pitch changes.

% Create the maximum amplitude:
Amplitude = 32767;
% Add an exponential decay:
Amplitude = Amplitude .* exp(-0.0003*t);

% Add an ocillation on the amplitude:
% Amplitude = Amplitude .* rand(1, length(x)); % Makes a shushing/roaring sound.
Amplitude = Amplitude .* sin(2.*pi.*t./2000); % Decaying pulsing sound.

% Construct the waveform:
y = int16(Amplitude .* sin(2.*pi.*t./T));
% y = abs(int16(Amplitude .* sin(2.*pi.*x./T)));

% Plot the waveform:
plot(t, y, 'b-');
title('Waveform', 'FontSize', fontSize);
xlabel('Time', 'FontSize', fontSize);
ylabel('Y', 'FontSize', fontSize);
grid on;
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]);
fprintf('Writing file %s...\n', fullFileName);

% Write the waveform to a file:
wavwrite(y, fullFileName);

% Play the sound as many times as the user wants.
playAgain = true;
counter = 1;
while playAgain
  % Play the sound that we just created.
  fprintf('Playing file %s   %d times...\n', fullFileName, counter);
  PlaySoundFile(folder, baseFileName);
  % Ask user if they want to play the sound again.
  promptMessage = sprintf('You have played the sound %d times.\nDo you want to play the sound again?', counter);
  titleBarCaption = 'Continue?';
  button = questdlg(promptMessage, titleBarCaption, 'Yes', 'No', 'Yes');
  if strcmpi(button, 'No')
    playAgain = false;
    break;
  end
  counter = counter + 1;
end

% Alert user that we are done.
message = sprintf('Done playing %s.\n', fullFileName);
fprintf('%s\n', message);
promptMessage = sprintf('Done playing %s.\nClick OK to close the window\nor Cancel to leave it up.', fullFileName);
titleBarCaption = 'Continue?';
button = questdlg(promptMessage, titleBarCaption, 'OK', 'Cancel', 'OK');
if strcmpi(button, 'OK')
  close all;  % Close down the figure.
end