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playsmoke(112, 1); % play at normal speed (Part a) | playsmoke(112, 1); % play at normal speed (Part a) | ||
playsmoke(224, 1); % play twice as fast (Part b) | playsmoke(224, 1); % play twice as fast (Part b) | ||
| − | playsmoke( | + | playsmoke(224, 2); % play with a frequency shift (Part c) |
wavwrite(buf,1/delta,32, 'smoke.wav'); % write to wav file | wavwrite(buf,1/delta,32, 'smoke.wav'); % write to wav file | ||
| Line 47: | Line 47: | ||
end | end | ||
</pre> | </pre> | ||
| − | [[Media: | + | [[Media:Trother_smoke2.wav]] |
<br/> | <br/> | ||
'''Part 2''' | '''Part 2''' | ||
Latest revision as of 09:33, 19 January 2011
Homework 1
Travis Rother
Part 1
% smoke.m
% Author: Travis Rother
% Description: plays beginning of smoke on the water in three different ways
function smoke()
delta = .00005;
buf = []; % stores the freq data to be written at the end
playsmoke(112, 1); % play at normal speed (Part a)
playsmoke(224, 1); % play twice as fast (Part b)
playsmoke(224, 2); % play with a frequency shift (Part c)
wavwrite(buf,1/delta,32, 'smoke.wav'); % write to wav file
function playsmoke(BPM, pitch)
% define the notes the song uses
G = note(-2);
Bf = note(1);
C = note(3);
Df = note(4);
% vector of notes the song plays
notes = [G Bf C G Bf Df C G Bf C Bf G];
% corresponding beat values for each note
beat = [1 1 1.5 1 1 .5 2 1 1 1.5 1 1];
% play all of the notes
for i=1:length(notes)
dur = (60/BPM)*beat(i);
t = 0:delta:dur;
z = sin(pitch*2*pi*notes(i)*t);
sound(z,1/delta);
buf = [buf; z(:)];
end
end
function freq = note(hsteps)
freq = 440 * 2^(hsteps/12);
end
end
Media:Trother_smoke2.wav
Part 2
[data, Fs] = wavread('Beatles.wav');
rev = flipud(data);
sound(rev,Fs);
wavwrite(rev,Fs,'revBeatles.wav');
Media:Trother_revBeatles.wav
a) "number 9, number 9, number 9... "
b) Yes I think it is possible that there is a hidden message. To me it sounds like "carry on, gentlemen". Or it could be nothing, just my brain trying to make sense of garbled sounds.
