(New page: == Homework 1 Solution == <ol> <li> <ol type="a"> <li> Below is a Matlab code that plays the melody of the song "Smoke on the Water" by Deep Purple at <b>original tempo</b>:<br><br> % Def...) |
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| − | == Homework 1 | + | == [[HW1_ECE301_Spring2011_Prof_Boutin|Homework 1]], [[2011_Spring_ECE_301_Boutin|ECE301 Spring 20011, Prof. Boutin]] == |
<ol> | <ol> | ||
<li> | <li> | ||
| Line 26: | Line 26: | ||
tune=[g b_flat c_dq g b_flat d_flat c_h g b_flat c_dq b_flat g];<br> | tune=[g b_flat c_dq g b_flat d_flat c_h g b_flat c_dq b_flat g];<br> | ||
sound(tune,1/T)<br> | sound(tune,1/T)<br> | ||
| − | wavwrite(tune,1/T,8,'1_a.wav')<br><br> | + | wavwrite(tune,1/T,8,'[[Media:hw1_ECE301S11_Prof_Boutin_1_a.wav|1_a.wav]]')<br><br> |
</li> | </li> | ||
<li> | <li> | ||
| − | Below is a Matlab code that plays the melody | + | Below is a Matlab code that plays the melody at <b>twice original tempo</b>:<br><br> |
% Defining sampling period and duration of a quarter note<br> | % Defining sampling period and duration of a quarter note<br> | ||
% The tempo of the song is increased by a factor of 2 by modifying the variable BMP accordingly<br> | % The tempo of the song is increased by a factor of 2 by modifying the variable BMP accordingly<br> | ||
| Line 52: | Line 52: | ||
tune=[g b_flat c_dq g b_flat d_flat c_h g b_flat c_dq b_flat g];<br> | tune=[g b_flat c_dq g b_flat d_flat c_h g b_flat c_dq b_flat g];<br> | ||
sound(tune,1/T)<br> | sound(tune,1/T)<br> | ||
| − | wavwrite(tune,1/T,8,'1_b.wav')<br><br> | + | wavwrite(tune,1/T,8,'[[Media:hw1_ECE301S11_Prof_Boutin_1_b.wav|1_b.wav]]')<br><br> |
</li> | </li> | ||
<li> | <li> | ||
| − | Below is a Matlab code that plays the melody | + | Below is a Matlab code that plays the melody after applying the transformation <b><math>y(t)=x(2t)</math></b>:<br><br> |
% Defining sampling period and duration of a quarter note<br> | % Defining sampling period and duration of a quarter note<br> | ||
T=0.00001;<br> | T=0.00001;<br> | ||
| Line 79: | Line 79: | ||
tune=[g b_flat c_dq g b_flat d_flat c_h g b_flat c_dq b_flat g];<br> | tune=[g b_flat c_dq g b_flat d_flat c_h g b_flat c_dq b_flat g];<br> | ||
sound(tune,1/T)<br> | sound(tune,1/T)<br> | ||
| − | wavwrite(tune,1/T,8,'1_c.wav')<br><br> | + | wavwrite(tune,1/T,8,'[[Media:hw1_ECE301S11_Prof_Boutin_1_c.wav|1_c.wav]]')<br><br> |
| + | </li> | ||
| + | </ol> | ||
| + | <li> | ||
| + | <ol type="a"> | ||
| + | <li> | ||
| + | The forward phrase is "Number nine". | ||
| + | </li> | ||
| + | <li> | ||
| + | Below is a Matlab code that plays the extract <b>backwards</b>:<br><br> | ||
| + | [song Fs nbits] = wavread('Beatles.wav');<br> | ||
| + | song = flipud(song);<br> | ||
| + | wavwrite(song, Fs, nbits,'[[Media:hw1_ECE301S11_Prof_Boutin_2_b.wav|2_b.wav]]')<br><br> | ||
| + | Yes, there is a subliminal message in this extract. The subliminal message is "Turn me on, dead man". | ||
| + | |||
| + | ---- | ||
| + | |||
| + | [[HW1 ECE301 Spring2011 Prof Boutin|Back to HW1]] | ||
| + | |||
| + | [[2011 Spring ECE 301 Boutin|Back to 2011 Spring ECE 301 Boutin]] <br> | ||
| + | |||
| + | [[Category:2011_Spring_ECE_301_Boutin]] | ||
Latest revision as of 11:29, 11 February 2011
Homework 1, ECE301 Spring 20011, Prof. Boutin
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Below is a Matlab code that plays the melody of the song "Smoke on the Water" by Deep Purple at original tempo:
% Defining sampling period and duration of a quarter note
T=0.00001;
BPM=112;
dur=1/(BPM/60);
% Defining note durations
haft=0:T:dur*2;
dotted_quart=0:T:dur*1.5;
quart=0:T:dur;
eighth=0:T:dur/2;
% Defining notes of the melody
g=sin(2*pi*392*quart);
b_flat=sin(2*pi*466.16*quart);
c_dq=sin(2*pi*523.25*dotted_quart);
c_h=sin(2*pi*523.25*haft);
d_flat=sin(2*pi*554.37*eighth);
% Creating, playing, and saving melody into a wave file
tune=[g b_flat c_dq g b_flat d_flat c_h g b_flat c_dq b_flat g];
sound(tune,1/T)
wavwrite(tune,1/T,8,'1_a.wav')
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Below is a Matlab code that plays the melody at twice original tempo:
% Defining sampling period and duration of a quarter note
% The tempo of the song is increased by a factor of 2 by modifying the variable BMP accordingly
T=0.00001;
BPM=2*112;
dur=1/(BPM/60);
% Defining note durations
haft=0:T:dur*2;
dotted_quart=0:T:dur*1.5;
quart=0:T:dur;
eighth=0:T:dur/2;
% Defining notes of the melody
g=sin(2*pi*392*quart);
b_flat=sin(2*pi*466.16*quart);
c_dq=sin(2*pi*523.25*dotted_quart);
c_h=sin(2*pi*523.25*haft);
d_flat=sin(2*pi*554.37*eighth);
% Creating, playing, and saving melody into a wave file
tune=[g b_flat c_dq g b_flat d_flat c_h g b_flat c_dq b_flat g];
sound(tune,1/T)
wavwrite(tune,1/T,8,'1_b.wav')
-
Below is a Matlab code that plays the melody after applying the transformation $ y(t)=x(2t) $:
% Defining sampling period and duration of a quarter note
T=0.00001;
BPM=112;
dur=1/(BPM/60);
% Defining note durations
haft=0:T:dur*2;
dotted_quart=0:T:dur*1.5;
quart=0:T:dur;
eighth=0:T:dur/2;
% Defining notes of the melody
% y(t)=x(2t) transformation is applied by multiplying the value inside the sine waves by a factor of 2
g=sin(2*pi*2**392*quart);
b_flat=sin(2*pi*2*466.16*quart);
c_dq=sin(2*pi*2*523.25*dotted_quart);
c_h=sin(2*pi*2*523.25*haft);
d_flat=sin(2*pi*2*554.37*eighth);
% Creating, playing, and saving melody into a wave file
tune=[g b_flat c_dq g b_flat d_flat c_h g b_flat c_dq b_flat g];
sound(tune,1/T)
wavwrite(tune,1/T,8,'1_c.wav')
-
Below is a Matlab code that plays the melody of the song "Smoke on the Water" by Deep Purple at original tempo:
-
- The forward phrase is "Number nine".
-
Below is a Matlab code that plays the extract backwards:
[song Fs nbits] = wavread('Beatles.wav');
song = flipud(song);
wavwrite(song, Fs, nbits,'2_b.wav')
Yes, there is a subliminal message in this extract. The subliminal message is "Turn me on, dead man".
Back to 2011 Spring ECE 301 Boutin
