delta = .00005;
% Beat
bpm = 112; %beat per minute
beat_interval = 60/bpm;
% Notes
quarter = 0:delta:beat_interval;
eighth = 0:delta:(beat_interval/2);
haft = 0:delta:(beat_interval*2);
dot_qrtr = 0:delta:(beat_interval*1.5);
%Frequencies of Notes
G = (2^(-2/12))*440;
Bf = (2^(1/12))*440;
C = (2^(3/12))*440;
Df = (2^(4/12))*440;
%Note Sounds
quarter_G = sin(2*pi*G*quarter);
quarter_Bf = sin(2*pi*Bf*quarter);
dot_qrtr_C = sin(2*pi*C*dot_qrtr);
eighth_Df = sin(2*pi*Df*eighth);
haft_C = sin(2*pi*C*haft);
haft_G = sin(2*pi*G*haft);
%Note Array
note_array = [quarter_G, quarter_Bf, dot_qrtr_C, quarter_G, quarter_Bf, eighth_Df, haft_C, quarter_G, quarter_Bf, dot_qrtr_C, quarter_Bf, quarter_G];
%Song on Regular Speed
sound(note_array, 1/delta);
wavwrite(note_array, 1/delta, '301_hw1_1A');
%Prob 1b -- Double Speed = half the beat interval
beat_interval2 = (beat_interval / 2);
% Notes 2x Speed
quarter2 = 0:delta:beat_interval2;
eighth2 = 0:delta:(beat_interval2 / 2);
haft2 = 0:delta:(beat_interval2 * 2);
dot_qrtr2 = 0:delta:(beat_interval2 * 1.5);
%Note Sounds 2x Speed
quarter_G2 = sin(2*pi*G*quarter2);
quarter_Bf2 = sin(2*pi*Bf*quarter2);
dot_qrtr_C2 = sin(2*pi*C*dot_qrtr2);
eighth_Df2 = sin(2*pi*Df*eighth2);
haft_C2 = sin(2*pi*C*haft2);
haft_G2 = sin(2*pi*G*haft2);
%Note Array 2x Speed
note_array2 = [quarter_G2 quarter_Bf2 dot_qrtr_C2 quarter_G2 quarter_Bf2 eighth_Df2 haft_C2 quarter_G2 quarter_Bf2 dot_qrtr_C2 quarter_Bf2 quarter_G2];
%Song on 2x Speed
sound(note_array2, 1/delta);
wavwrite(note_array2, 1/delta, '301_hw1_1B');
%Prob 1c -- Twice the pitch
%Note Sounds 2x Pitch
quarter_G3 = sin(2*pi*G*quarter);
quarter_Bf3 = sin(2*pi*Bf*quarter);
dot_qrtr_C3 = sin(2*pi*C*dot_qrtr);
eighth_Df3 = sin(2*pi*Df*eighth);
haft_C3 = sin(2*pi*C*haft);
haft_G3 = sin(2*pi*G*haft);
%Note Array 2x Pitch
note_array3 = [quarter_G3 quarter_Bf3 dot_qrtr_C3 quarter_G3 quarter_Bf3 eighth_Df3 haft_C3 quarter_G3 quarter_Bf3 dot_qrtr_C3 quarter_Bf3 quarter_G3];
%Song on 2x Pitch
sound(note_array3, 1/ delta);
wavwrite(note_array3, 1/delta, '301_hw1_1C');
%Problem 2
%Read and play the original song
[y, Fs] = wavread('Beatles.wav');
sound(y, Fs);
%Flip the song and save this version
flip = flipud(y);
sound(flip, Fs);
wavwrite(flip, Fs, 'Beatles_flip');
% 1. Number 9 is repeated.
% 2. It sounds mostly like gibberish but if I had to guess it ends in dead man.
