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Instructor's note: just put a space at the beginning of each line of code. That way your text won't be interpreted as wikitext code, and it will display correctly. -pm
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The following code is what composes the .m file that satisfies this homework assignment. The first part (labeled "Part 1") plays the first line of 'Smoke on the Water' by Deep Purple, then plays it at 2x speed, then 2x amplitude. The second part load the Beatles song, plays it, then reverses it, and plays it again. The source code below is attached, as well as the .wav file of the reversed beatles song. I am not certain what it says in revers, but I have to believe that whatever the random collection of notes is that would be produced by playing it in reverse would not be intentional, or even particularly legible.
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<pre>&nbsp;%Derek Richards
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%Derek Richards  
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  %HW 1 ECE 301  
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  %######                            # 
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  %HW 1 ECE 301
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  %#    #  ##   ##### #####      ## 
−
  %______          _    __ &nbsp;%
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  %#    # # # #    #  #      # # 
−
  %| ___ \        | |   / |&nbsp;%
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  %###### #    # #    #  #        # 
−
  %| |_/ /__ _ _ __| |_ `| |&nbsp;%
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  %#      ###### #####    #        # 
−
  %|  __// _` | '__| __| | |&nbsp;%
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  %#      #    # #   #    #        #    
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  %| | | (_| | | | |_  _| |_%
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%#      #    # #    #  #      #####
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  %\_|   \__,_|_|   \__| \___/%
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  b=(112/60);&nbsp;%b is the time of one standard beat
 
  b=(112/60);&nbsp;%b is the time of one standard beat
 
  half_b=0.5*(112/60);
 
  half_b=0.5*(112/60);
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  e=@(tempo)0:delta:0.125*tempo;&nbsp;%eigth note
 
  e=@(tempo)0:delta:0.125*tempo;&nbsp;%eigth note
 
  A4=440;&nbsp;%Frequency of note A4
 
  A4=440;&nbsp;%Frequency of note A4
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  %Note funtion takes 2 variables
 
  %Note funtion takes 2 variables
 
  %ntype: type of note (w,h,q,dotq,e)
 
  %ntype: type of note (w,h,q,dotq,e)
 
  %dev_A4: deviation from note A4 positive is up the scale, negative is down
 
  %dev_A4: deviation from note A4 positive is up the scale, negative is down
 
  NOTE = @(ntype,dev_A4) sin(2*pi*2^(dev_A4/12)*A4*ntype);
 
  NOTE = @(ntype,dev_A4) sin(2*pi*2^(dev_A4/12)*A4*ntype);
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  %Smoke on the Water, by Deep Purple
 
  %Smoke on the Water, by Deep Purple
 
  sound(NOTE(q(b),-2),1/delta);
 
  sound(NOTE(q(b),-2),1/delta);
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  sound(NOTE(q(b),1),1/delta);
 
  sound(NOTE(q(b),1),1/delta);
 
  sound(NOTE(e(b),5),1/delta);
 
  sound(NOTE(e(b),5),1/delta);
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sound(NOTE(h(b),4),1/delta);
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sound(NOTE(q(b),-2),1/delta);
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sound(NOTE(q(b),1),1/delta);
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sound(NOTE(dotq(b),4),1/delta);
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sound(NOTE(e(b),1),1/delta);
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sound(NOTE(e(b),1),1/delta);
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sound(NOTE(h(b),-2),1/delta);
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%Silence to create a pause before 2x speed
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sound(NOTE(q(8),68),1/delta);
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%Smoke on the Water, by deep Purple, twice tempo
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sound(NOTE(q(half_b),-2),1/delta);
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sound(NOTE(q(half_b),1),1/delta);
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sound(NOTE(dotq(half_b),4),1/delta);
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sound(NOTE(q(half_b),-2),1/delta);
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sound(NOTE(q(half_b),-2),1/delta);
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sound(NOTE(q(half_b),1),1/delta);
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sound(NOTE(e(half_b),5),1/delta);
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sound(NOTE(h(half_b),4),1/delta);
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sound(NOTE(q(half_b),-2),1/delta);
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sound(NOTE(q(half_b),1),1/delta);
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sound(NOTE(dotq(half_b),4),1/delta);
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sound(NOTE(e(half_b),1),1/delta);
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sound(NOTE(e(half_b),1),1/delta);
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sound(NOTE(h(half_b),-2),1/delta);
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%Silence to create a pause before x(2*t) speed
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sound(NOTE(q(8),68),1/delta);
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%Smoke on the Water, by deep Purple, x(2*t)
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NOTE = @(ntype,dev_A4) sin(2*2*pi*2^(dev_A4/12)*A4*ntype);
 +
sound(NOTE(q(b),-2),1/delta);
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sound(NOTE(q(b),1),1/delta);
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sound(NOTE(dotq(b),4),1/delta);
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sound(NOTE(q(b),-2),1/delta);
 +
sound(NOTE(q(b),-2),1/delta);
 +
sound(NOTE(q(b),1),1/delta);
 +
sound(NOTE(e(b),5),1/delta);
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sound(NOTE(h(b),4),1/delta);
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sound(NOTE(q(b),-2),1/delta);
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sound(NOTE(q(b),1),1/delta);
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sound(NOTE(dotq(b),4),1/delta);
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sound(NOTE(e(b),1),1/delta);
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sound(NOTE(e(b),1),1/delta);
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sound(NOTE(h(b),-2),1/delta);
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 +
%######                          ##### 
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%#    #  ##  #####  #####    #    #
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%#    #  #  #  #    #  #            #
 +
%######  #    # #    #  #      ##### 
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%#      ###### #####    #      #     
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%#      #    # #  #    #      #     
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%#      #    # #    #  #      #######
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 +
%lets assume the file Beatles.wav is in the current directory...
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[beatle_song, Fs] = wavread('Beatles.wav');
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sound(beatle_song,Fs);
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beatle_song_rev = flipud(beatle_song);
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sound(beatle_song_rev,Fs);
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wavwrite(beatle_song_rev,Fs,'Ece301_HW1_part2');
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%END CODE
  
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sound(NOTE(h(b),4),1/delta); sound(NOTE(q(b),-2),1/delta); sound(NOTE(q(b),1),1/delta); sound(NOTE(dotq(b),4),1/delta); sound(NOTE(e(b),1),1/delta); sound(NOTE(e(b),1),1/delta); sound(NOTE(h(b),-2),1/delta); %Silence to create a pause before 2x speed sound(NOTE(q(8),68),1/delta); %Smoke on the Water, by deep Purple, twice tempo sound(NOTE(q(half_b),-2),1/delta); sound(NOTE(q(half_b),1),1/delta); sound(NOTE(dotq(half_b),4),1/delta); sound(NOTE(q(half_b),-2),1/delta); sound(NOTE(q(half_b),-2),1/delta); sound(NOTE(q(half_b),1),1/delta); sound(NOTE(e(half_b),5),1/delta); sound(NOTE(h(half_b),4),1/delta); sound(NOTE(q(half_b),-2),1/delta); sound(NOTE(q(half_b),1),1/delta); sound(NOTE(dotq(half_b),4),1/delta); sound(NOTE(e(half_b),1),1/delta); sound(NOTE(e(half_b),1),1/delta); sound(NOTE(h(half_b),-2),1/delta); %Silence to create a pause before x(2*t) speed sound(NOTE(q(8),68),1/delta); %Smoke on the Water, by deep Purple, x(2*t) NOTE = @(ntype,dev_A4) sin(2*2*pi*2^(dev_A4/12)*A4*ntype); sound(NOTE(q(b),-2),1/delta); sound(NOTE(q(b),1),1/delta); sound(NOTE(dotq(b),4),1/delta); sound(NOTE(q(b),-2),1/delta); sound(NOTE(q(b),-2),1/delta); sound(NOTE(q(b),1),1/delta); sound(NOTE(e(b),5),1/delta); sound(NOTE(h(b),4),1/delta); sound(NOTE(q(b),-2),1/delta); sound(NOTE(q(b),1),1/delta); sound(NOTE(dotq(b),4),1/delta); sound(NOTE(e(b),1),1/delta); sound(NOTE(e(b),1),1/delta); sound(NOTE(h(b),-2),1/delta); %______ _ _____&nbsp;% %| ___ \ | | / __ \% %| |_/ /__ _ _ __| |_ `' / /'% %| __// _` | '__| __| / / &nbsp;% %| | | (_| | | | |_ ./ /___% %\_| \__,_|_| \__| \_____/%
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</pre>
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Beatles Song: [[Media:Ece301_HW1_part2_Derek_Richards.wav]]
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%lets assume the file Beatles.wav is in the current directory... [beatle_song, Fs] = wavread('Beatles.wav'); sound(beatle_song,Fs); beatle_song_rev = flipud(beatle_song); sound(beatle_song_rev,Fs); wavwrite(beatle_song_rev,Fs,'Ece301_HW1_part2'); %END CODE
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Latest revision as of 12:13, 15 January 2011

The following code is what composes the .m file that satisfies this homework assignment. The first part (labeled "Part 1") plays the first line of 'Smoke on the Water' by Deep Purple, then plays it at 2x speed, then 2x amplitude. The second part load the Beatles song, plays it, then reverses it, and plays it again. The source code below is attached, as well as the .wav file of the reversed beatles song. I am not certain what it says in revers, but I have to believe that whatever the random collection of notes is that would be produced by playing it in reverse would not be intentional, or even particularly legible. 

 %Derek Richards
 %HW 1 ECE 301 
 %######                            #   
 %#     #   ##   #####  #####      ##   
 %#     #  #  #  #    #   #       # #   
 %######  #    # #    #   #         #   
 %#       ###### #####    #         #   
 %#       #    # #   #    #         #   
 %#       #    # #    #   #       ##### 
 
 b=(112/60); %b is the time of one standard beat
 half_b=0.5*(112/60);
 delta=0.000025; %arbitray variable small enough to sample well

 w=@(tempo)0:delta:tempo; %whole note
 h=@(tempo)0:delta:0.5*tempo; %half note
 q=@(tempo)0:delta:0.25*tempo; %quarter note
 dotq=@(tempo)0:delta:1.5*0.25*tempo; %dotted quarter note
 e=@(tempo)0:delta:0.125*tempo; %eigth note
 A4=440; %Frequency of note A4
 
 %Note funtion takes 2 variables
 %ntype: type of note (w,h,q,dotq,e)
 %dev_A4: deviation from note A4 positive is up the scale, negative is down
 NOTE = @(ntype,dev_A4) sin(2*pi*2^(dev_A4/12)*A4*ntype);
 
 %Smoke on the Water, by Deep Purple
 sound(NOTE(q(b),-2),1/delta);
 sound(NOTE(q(b),1),1/delta);
 sound(NOTE(dotq(b),4),1/delta);
 sound(NOTE(q(b),-2),1/delta);
 sound(NOTE(q(b),-2),1/delta);
 sound(NOTE(q(b),1),1/delta);
 sound(NOTE(e(b),5),1/delta);
 sound(NOTE(h(b),4),1/delta);
 sound(NOTE(q(b),-2),1/delta);
 sound(NOTE(q(b),1),1/delta);
 sound(NOTE(dotq(b),4),1/delta);
 sound(NOTE(e(b),1),1/delta);
 sound(NOTE(e(b),1),1/delta);
 sound(NOTE(h(b),-2),1/delta);
 %Silence to create a pause before 2x speed
 sound(NOTE(q(8),68),1/delta);
 %Smoke on the Water, by deep Purple, twice tempo
 sound(NOTE(q(half_b),-2),1/delta);
 sound(NOTE(q(half_b),1),1/delta);
 sound(NOTE(dotq(half_b),4),1/delta);
 sound(NOTE(q(half_b),-2),1/delta);
 sound(NOTE(q(half_b),-2),1/delta);
 sound(NOTE(q(half_b),1),1/delta);
 sound(NOTE(e(half_b),5),1/delta);
 sound(NOTE(h(half_b),4),1/delta);
 sound(NOTE(q(half_b),-2),1/delta);
 sound(NOTE(q(half_b),1),1/delta);
 sound(NOTE(dotq(half_b),4),1/delta);
 sound(NOTE(e(half_b),1),1/delta);
 sound(NOTE(e(half_b),1),1/delta);
 sound(NOTE(h(half_b),-2),1/delta);
 %Silence to create a pause before x(2*t) speed
 sound(NOTE(q(8),68),1/delta);
 %Smoke on the Water, by deep Purple, x(2*t)
 NOTE = @(ntype,dev_A4) sin(2*2*pi*2^(dev_A4/12)*A4*ntype);
 sound(NOTE(q(b),-2),1/delta);
 sound(NOTE(q(b),1),1/delta);
 sound(NOTE(dotq(b),4),1/delta);
 sound(NOTE(q(b),-2),1/delta);
 sound(NOTE(q(b),-2),1/delta);
 sound(NOTE(q(b),1),1/delta);
 sound(NOTE(e(b),5),1/delta);
 sound(NOTE(h(b),4),1/delta);
 sound(NOTE(q(b),-2),1/delta);
 sound(NOTE(q(b),1),1/delta);
 sound(NOTE(dotq(b),4),1/delta);
 sound(NOTE(e(b),1),1/delta);
 sound(NOTE(e(b),1),1/delta);
 sound(NOTE(h(b),-2),1/delta);
 
 %######                          #####  
 %#     #   ##   #####  #####    #     # 
 %#     #  #  #  #    #   #            # 
 %######  #    # #    #   #       #####  
 %#       ###### #####    #      #       
 %#       #    # #   #    #      #       
 %#       #    # #    #   #      #######
 
 %lets assume the file Beatles.wav is in the current directory...
 [beatle_song, Fs] = wavread('Beatles.wav');
 sound(beatle_song,Fs);
 beatle_song_rev = flipud(beatle_song);
 sound(beatle_song_rev,Fs);
 wavwrite(beatle_song_rev,Fs,'Ece301_HW1_part2');
 %END CODE

Beatles Song: Media:Ece301_HW1_part2_Derek_Richards.wav

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