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| − | + | == Matlab Code == | |
| + | <pre> | ||
| + | %% Joshua Long | ||
| + | %% ECE 301 | ||
| + | %% HW 1.1 Playing Music | ||
| + | |||
| + | %% clear memory | ||
| + | clear | ||
| + | |||
| + | %% clear console | ||
| + | clc | ||
| + | |||
| + | delta = .00005; | ||
| + | |||
| + | tempo = 60/140; | ||
| + | |||
| + | %%Values for note lengths | ||
| + | hn = 0:delta:2*tempo; | ||
| + | qn = 0:delta:tempo; | ||
| + | en = 0:delta:.5*tempo; | ||
| + | dqn = 0:delta:1.5*tempo; | ||
| + | |||
| + | %%Values for note lengths for Twice the tempo | ||
| + | thn = 0:delta:.5*2*tempo; | ||
| + | tqn = 0:delta:.5*tempo; | ||
| + | ten = 0:delta:.5*.5*tempo; | ||
| + | tdqn = 0:delta:.5*1.5*tempo; | ||
| + | |||
| + | %%Values for the freq. of notes | ||
| + | Eb = 311.13; | ||
| + | F = 349.23; | ||
| + | G = 392.00; | ||
| + | Ab = 415.30; | ||
| + | Bb = 466.16; | ||
| + | C = 523.25; | ||
| + | |||
| + | %%Regular Tempo | ||
| + | y = [sin(2*pi*Eb*hn),sin(2*pi*F*qn),sin(2*pi*G*qn),sin(2*pi*Ab*dqn),sin(2*pi*Bb*en), sin(2*pi*C*qn)]; | ||
| + | %%Transformation of x(t) = y(2) | ||
| + | x = [sin(2*pi*2*Eb*hn),sin(2*pi*2*F*qn),sin(2*pi*2*G*qn),sin(2*pi*2*Ab*dqn),sin(2*pi*2*Bb*en), sin(2*pi*2*C*qn)]; | ||
| + | %%Tempo Twice as Fast | ||
| + | z = [sin(2*pi*Eb*thn),sin(2*pi*F*tqn),sin(2*pi*G*tqn),sin(2*pi*Ab*tdqn),sin(2*pi*Bb*ten), sin(2*pi*C*tqn)]; | ||
| + | |||
| + | sound(y,1/delta); | ||
| + | sound(z,1/delta); | ||
| + | sound(x,1/delta); | ||
| + | |||
| + | %%Save a wav file: | ||
| + | wavwrite([y,z,x],44100/2.2,32,'N:\Personal\ECE301\Hail_Purdue.wav'); | ||
| + | |||
| + | </pre> | ||
| + | |||
| + | |||
| + | == Results == | ||
| + | |||
| + | The [[Media:JAL_Hail_Purdue.wav _ECE301Fall2008mboutin| audio file]] contains the regular Hail Purdue followed by the tune being played twice as fast followed by the y(t)=x(2t) transformation. | ||
| + | |||
| + | The first two have the same sounding notes but the 2nd is just half the time to play. However, the last one made the frequency twice as fast and made it half the tempo. | ||
Latest revision as of 08:17, 5 September 2008
Matlab Code
%% Joshua Long %% ECE 301 %% HW 1.1 Playing Music %% clear memory clear %% clear console clc delta = .00005; tempo = 60/140; %%Values for note lengths hn = 0:delta:2*tempo; qn = 0:delta:tempo; en = 0:delta:.5*tempo; dqn = 0:delta:1.5*tempo; %%Values for note lengths for Twice the tempo thn = 0:delta:.5*2*tempo; tqn = 0:delta:.5*tempo; ten = 0:delta:.5*.5*tempo; tdqn = 0:delta:.5*1.5*tempo; %%Values for the freq. of notes Eb = 311.13; F = 349.23; G = 392.00; Ab = 415.30; Bb = 466.16; C = 523.25; %%Regular Tempo y = [sin(2*pi*Eb*hn),sin(2*pi*F*qn),sin(2*pi*G*qn),sin(2*pi*Ab*dqn),sin(2*pi*Bb*en), sin(2*pi*C*qn)]; %%Transformation of x(t) = y(2) x = [sin(2*pi*2*Eb*hn),sin(2*pi*2*F*qn),sin(2*pi*2*G*qn),sin(2*pi*2*Ab*dqn),sin(2*pi*2*Bb*en), sin(2*pi*2*C*qn)]; %%Tempo Twice as Fast z = [sin(2*pi*Eb*thn),sin(2*pi*F*tqn),sin(2*pi*G*tqn),sin(2*pi*Ab*tdqn),sin(2*pi*Bb*ten), sin(2*pi*C*tqn)]; sound(y,1/delta); sound(z,1/delta); sound(x,1/delta); %%Save a wav file: wavwrite([y,z,x],44100/2.2,32,'N:\Personal\ECE301\Hail_Purdue.wav');
Results
The audio file contains the regular Hail Purdue followed by the tune being played twice as fast followed by the y(t)=x(2t) transformation.
The first two have the same sounding notes but the 2nd is just half the time to play. However, the last one made the frequency twice as fast and made it half the tempo.
