apd lab2 assig1

adjustVolume('input.wav', 6, 'output.wav')

function adjustVolume(inputFile, dBGain, outputFile)
    if ~exist(inputFile, 'file')
        error('Input file does not exist.');
    end

    [audioIn, sampleRate] = audioread(inputFile);

    gainFactor = 10^(dBGain/20);

    audioOut = audioIn * gainFactor;

    audiowrite(outputFile, audioOut, sampleRate);

    t = (0:length(audioIn) - 1) / sampleRate;

    figure;

    subplot(2, 1, 1);
    plot(t, audioIn);
    title('Input Waveform');
    xlabel('Time (s)');
    ylabel('Amplitude');

    subplot(2, 1, 2);
    plot(t, audioOut);
    title('Output Waveform');
    xlabel('Time (s)');
    ylabel('Amplitude');

    disp('Volume adjustment complete.')
end