| Line 1: | Line 1: | ||
% Question 1 | % Question 1 | ||
| + | |||
function[] = question1() | function[] = question1() | ||
N1 = sin(2*pi*391.995436*[0:0.0001:1]); %G quarter note | N1 = sin(2*pi*391.995436*[0:0.0001:1]); %G quarter note | ||
| Line 26: | Line 27: | ||
| − | |||
| + | % Question 2 | ||
| − | |||
function[] = question2() | function[] = question2() | ||
[y, Fs] = wavread('Beatles.wav'); | [y, Fs] = wavread('Beatles.wav'); | ||
y = flipud(y); | y = flipud(y); | ||
wavwrite(y, Fs, 'question2.wav'); | wavwrite(y, Fs, 'question2.wav'); | ||
| − | |||
| − | |||
| − | |||
| − | 1. Repeated phrase | + | 1. Repeated phrase "number nine". |
| − | 2. I don't | + | 2. I don't hear anything in the reversed message. |
Revision as of 19:42, 14 January 2011
% Question 1
function[] = question1() N1 = sin(2*pi*391.995436*[0:0.0001:1]); %G quarter note N2 = sin(2*pi*466.1637615*[0:0.0001:1]); %Bflat quarter N3 = sin(2*pi*523.2511306*[0:0.0001:1.5]); %C dotted quarter N4 = sin(2*pi*391.995436*[0:0.0001:1]); %G quarter N5 = sin(2*pi*466.1637615*[0:0.0001:1]); %Bflat quarter N6 = sin(2*pi*554.3652618*[0:0.0001:0.5]); %Csharp eigth N7 = sin(2*pi*523.2511306*[0:0.0001:2]); %C half
rest = [0:0.0001:2.5]; %rest half and an eigth
%smoke on the water (part a): tune = [N1 N2 N3 N4 N5 N6 N7 N1 N2 N3 N2 N1 rest];
newtune = [1:1:(length(tune)/2)]; % newtune(t) = tune(2t) for i=1:(length(tune)/2)
newtune(1,i) = tune(1,2*i);
end
%all three parts: alltunes = [tune newtune newtune];
wavwrite(0.02*alltunes, 18667, 'question1.wav');
% Question 2
function[] = question2() [y, Fs] = wavread('Beatles.wav'); y = flipud(y); wavwrite(y, Fs, 'question2.wav');
1. Repeated phrase "number nine". 2. I don't hear anything in the reversed message.
