HW1, ECE301, Prof. Boutin

In this homework assignment, we were asked to write a Matlab code to play the "Hail Purdue" song with different speeds and pitch.

Sound Files

Sound File

MATLAB Code Hail Purdue

% Mark Frankosky (mfrankos@purdue.edu)
% ECE301 HW1.1
% Hail Purdue

% Set up Sample Rate
SampleRate = 1/20000;
timeSig = 172;

% Times
Q = 60/timeSig;
E = 60/timeSig/2;
DQ = Q+E;
H = 2*Q;
DH = H+Q;

% Set up note frequencies...
C4  = 2*130.81;
C4S = 2*138.59;
D4  = 2*146.83;
D4S = 2*155.56;
E4  = 2*164.81;
F4  = 2*174.61;
F4S = 2*185;
G4  = 2*196;
G4S = 2*207.65;
A4  = 2*220;
A4S = 2*233.08;
B4  = 2*246.94;

% Set up Notes
Notes = [A4 B4 C4S D4 E4 F4S F4S G4 G4 G4 D4 E4 F4 F4S];

% Set up Times
NoteLength = [H Q Q DQ E Q Q Q E E Q E E DH];

% Play normal speed
for nn=1:length(NoteLength)
  
  TimeVector    = 0:SampleRate:NoteLength(nn);
  SoundVector   = sin(2*pi*Notes(nn)*TimeVector);

  soundsc(SoundVector, 1/SampleRate);
end

pause(2)

% Play second time twice as fast
for nn=1:length(NoteLength)
  
  TimeVector    = 0:SampleRate:.5*NoteLength(nn);
  SoundVector   = sin(2*pi*Notes(nn)*TimeVector);

  soundsc(SoundVector, 1/SampleRate);
end

pause(2)

% play third time with twice the frequency
% same as applying the transform x(2t)
for nn=1:length(NoteLength)
  
  TimeVector    = 0:SampleRate:NoteLength(nn);
  SoundVector   = sin(2*2*pi*Notes(nn)*TimeVector);

  soundsc(SoundVector, 1/SampleRate);
end

MATLAB Code Mario

% Mark Frankosky (mfrankos@purdue.edu)
% ECE301 HW1.1
% Not quite hail purdue

SampleRate = 1/20000;
timeSig = 216;

% Times
Q = 60/timeSig;
E = 60/timeSig/2;
DQ = Q+E;
H = 2*Q;

% Set up note frequencies...
% (many arent used...but didnt feel like figuring out which ones were)
C3  = 130.81;
C3S = 138.59;
D3  = 146.83;
D3S = 155.56;
E3  = 164.81;
F3  = 174.61;
F3S = 185;
G3  = 196;
G3S = 207.65;
A3  = 220;
A3S = 233.08;
B3  = 246.94;

C4  = 2*130.81;
C4S = 2*138.59;
D4  = 2*146.83;
D4S = 2*155.56;
E4  = 2*164.81;
F4  = 2*174.61;
F4S = 2*185;
G4  = 2*196;
G4S = 2*207.65;
A4  = 2*220;
A4S = 2*233.08;
B4  = 2*246.94;

C5  = 3*130.81;
C5S = 3*138.59;
D5  = 3*146.83;
D5S = 3*155.56;
E5  = 3*164.81;
F5  = 3*174.61;
F5S = 3*185;
G5  = 3*196;
G5S = 3*207.65;
A5  = 3*220;
A5S = 3*233.08;
B5  = 3*246.94;

% Rest Value (no freqency)
REST = 0;

% Set up Note Values
Notes1 = [E5 E5 REST E5 REST C5 E5 G5 REST G4 REST C5 G4 REST E4 A4 B4 ...
          A4S A4 G4 E5 G5 A5 F5 G5 REST E5 C5 D5 B4 C5 G4 REST E4 A4 B4 ...
          A4S A4 G4 E5 G5 A5 F5 G5 REST E5 C5 D5 B4];
    
Notes2 = [F4S F4S REST F4S REST F4S F4S G4 REST G4 REST E4 E4 REST C4 ...
          C4 D4 C4S C4 C4 G4 B4 C5 A4 B4 REST A4 E4 F4 D4 E4 E4 REST ...
          C4 C4 D4 C4S C4 C4 G4 B4 C5 A4 B4 REST A4 E4 F4 D4 ];

Notes3 = [D3 D3 REST D3 REST D3 D3 G3 REST G3 REST G3 E3 REST C3 F3 G3 ...
          F3S F3 E3 C4 E4 F4 D4 E4 REST C4 A3 B3 G3 G3 E3 REST C3 F3 G3...
          F3S F3 E3 C4 E4 F4 D4 E4 REST C4 A3 B3 G3 ];

% Set up Time values
Time = [E E E E E E Q Q Q Q Q DQ E Q H Q Q E Q Q Q Q Q E E E Q E E DQ ...
        DQ E Q H Q Q E Q Q Q Q Q E E E Q E E DQ];

TotalVector = 0;

% Play normal speed
for nn=1:length(Time)
  
  t = 0:SampleRate:Time(nn);
  SoundVector1 = sin(2*pi*Notes1(nn)*t);
  SoundVector2 = sin(2*pi*Notes2(nn)*t);
  SoundVector3 = sin(2*pi*Notes3(nn)*t);
  
  SoundVectorSum  = SoundVector1+SoundVector2+SoundVector3;
  TotalVector     = [TotalVector SoundVectorSum];
  soundsc(SoundVectorSum, 1/SampleRate);
end

pause(3)

% play double speed
for nn=1:length(Time)
  
  t = 0:SampleRate:0.5*Time(nn);
  SoundVector1 = sin(2*pi*Notes1(nn)*t);
  SoundVector2 = sin(2*pi*Notes2(nn)*t);
  SoundVector3 = sin(2*pi*Notes3(nn)*t);
  
  SoundVectorSum  = SoundVector1+SoundVector2+SoundVector3;
  TotalVector     = [TotalVector SoundVectorSum];
  soundsc(SoundVectorSum, 1/SampleRate);
end

pause(3)

% play with 2x frequency
for nn=1:length(Time)
  
  t = 0:SampleRate:Time(nn);
  SoundVector1 = sin(2*2*pi*Notes1(nn)*t);
  SoundVector2 = sin(2*2*pi*Notes2(nn)*t);
  SoundVector3 = sin(2*2*pi*Notes3(nn)*t);
  
  SoundVectorSum  = SoundVector1+SoundVector2+SoundVector3;
  TotalVector     = [TotalVector SoundVectorSum];
  soundsc(SoundVectorSum, 1/SampleRate);
end