Revision as of 02:24, 18 January 2011

Michael Meyer: ECE 301 Homework 1

clear all;
clc

%%Question 1. Part 1.%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

bpm = 112;

delta = 0.00005;

%%Note lengths.
half = [0:delta:120/bpm];
quart = [0:delta:60/bpm];
eighth = [0:delta:30/bpm];
dotquart = [0:delta:90/bpm];

%%Note Frequencies.
gfreq = 2^(-2/12)*440;
bffreq = 2^(1/12)*440;
cfreq = 2^(3/12)*440;
dffreq = 2^(4/12)*440;

%%Notes
G = sin(2*pi*gfreq*quart);
Bf = sin(2*pi*bffreq*quart);
Cdq = sin(2*pi*cfreq*dotquart);
Df = sin(2*pi*dffreq*eighth);
Ch = sin(2*pi*cfreq*half);

%%Song
song = [G, Bf, Cdq, G, Bf, Df, Ch, G, Bf, Cdq, Bf, G];

sound(song, 1/delta)
wavwrite(song, 1/delta, '112bpm.wav')
pause(1);

%%Question 1. Part 2.%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

bpmfast = 224;

%%Note lengths.
half = [0:delta:120/bpmfast];
quart = [0:delta:60/bpmfast];
eighth = [0:delta:30/bpmfast];
dotquart = [0:delta:90/bpmfast];

%%Notes
G = sin(2*pi*gfreq*quart);
Bf = sin(2*pi*bffreq*quart);
Cdq = sin(2*pi*cfreq*dotquart);
Df = sin(2*pi*dffreq*eighth);
Ch = sin(2*pi*cfreq*half);

%%Fast Song
fastsong = [G, Bf, Cdq, G, Bf, Df, Ch, G, Bf, Cdq, Bf, G];

sound(fastsong, 1/delta)
wavwrite(fastsong, 1/delta, '224bpm.wav')
pause(1);

%%Question 1. Part 3.%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

bpm = 112;

delta = 0.00005;

%%Note lengths.
half = [0:delta:120/bpm];
quart = [0:delta:60/bpm];
eighth = [0:delta:30/bpm];
dotquart = [0:delta:90/bpm];

%%Note Frequencies.
gfreq = 2^(-2/12)*440;
bffreq = 2^(1/12)*440;
cfreq = 2^(3/12)*440;
dffreq = 2^(4/12)*440;

%%Notes
G = sin(4*pi*gfreq*quart);
Bf = sin(4*pi*bffreq*quart);
Cdq = sin(4*pi*cfreq*dotquart);
Df = sin(4*pi*dffreq*eighth);
Ch = sin(4*pi*cfreq*half);

%%Song
highsong = [G, Bf, Cdq, G, Bf, Df, Ch, G, Bf, Cdq, Bf, G];

sound(highsong, 1/delta)
wavwrite(highsong, 1/delta, 'highpitch.wav')

%%Combining all songs into one.
combined = horzcat(1, song, fastsong, highsong);

wavwrite(combined, 1/delta, 'combined.wav')

%%Question 2. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

[Beatles, fs, N] = wavread('Beatles.wav');
RevBeatles = flipud(Beatles);
sound(RevBeatles, fs)
wavwrite(RevBeatles, fs, N, 'seltaeB.wav');

Output Files:

112bpm.wav

224bpm.wav

highpitch.wav

combined.wav

seltaeB.wav