tremolo

inputFilePath = 'input.wav';
outputFilePath = 'output_with_tremolo.wav';
modulatorAmplitude = 0.95; % Adjust the modulation depth as needed
modulatorFrequency = 400;   % Adjust the modulation frequency as needed

addTremolo(inputFilePath, outputFilePath, modulatorAmplitude, modulatorFrequency);


function addTremolo(inputFilePath, outputFilePath, modulatorAmplitude, modulatorFrequency)
    [inputWave, fs] = audioread(inputFilePath);

    t = (0:length(inputWave) - 1) / fs;
    modulatorSignal = 1 + modulatorAmplitude * sin(2 * pi * modulatorFrequency * t);

    outputWave = inputWave .* modulatorSignal';

    audiowrite(outputFilePath, outputWave, fs);

    figure;

    subplot(3, 1, 1);
    plot(t(1:1000), inputWave(1:1000));
    title('Input Wave');

    subplot(3, 1, 2);
    plot(t(1:1000), outputWave(1:1000));
    title('Output Wave (with Tremolo)');

    subplot(3, 1, 3);
    plot(t(1:1000), modulatorSignal(1:1000));
    title('Modulator Signal');

end