Merge branch 'main' of https://github.com/ltcptgeneral/ece45-project

src/Generators/generate_pulse.m

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+function x = generate_pulse(amplitude, frequency, phase, fs, duration, duty)
+% GENERATE_puse: returns a matrix of sampled pulse wave
+
+% CONTRIBUTORS:
+% Brian Tran: Created the wave
+
+% DOCUMENTATION:
+% phase shift is in number of periods
+% fs is the sampling frequency: how many sample points per second
+% duration is time in seconds
+% duty is a number between 0 and 1
+
+    % initialize local variables from input arguments
+    n = fs * duration; % number of samples (length of matrix)
+    dt = 1 / fs; % sampling period: time between two sample points
+    % initialize a one dimensional zero matrix to be populated
+    x = zeros(1, n);
+    f0=1e+6;  % 1MHz
+    Fs=3e+6;
+    Tf=0.001;  % 1 millisecond
+    t=0:1/Fs:Tf-1/Fs;
+    td=0.1;   % duty cycle 
+    A0=10; % 10 Volts
+    F=0;
+    N=1000; % Number of points 
+
+    % populate the matrix
+    for n = 1:N
+        F=F+(1/n)*cos(n*2*pi*f0*t).*sin(n*pi*td);
+    end
+    F=F*(2*A0/pi);
+    F=F+A0*td;
+end

src/distortion_filter.m

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+% An audio is distorted based on the value of HIGH. Nothing of a certain
+% threshold should be played above this constant, or they are simply clipped to this 
+% value. Inspired from Meghaj_Echo.m and epic_effect_schluep.m.
+% Author: Jason Liang
+% Mekhi Ellington: Added some comments and editted formatting
+
+function y = distortion_filter(x, HIGH)
+  len = length(X);    %Storing length of X.
+  X = fft(x);         %X is the Fourier Transform of x.
+  X = fftshift(X);    %Shifts X.
+  Y = zeros(1, len);  %Matrix of length containing zeros.
+  
+  for ind = 1:len
+    if (X(ind) > HIGH) 
+       Y(ind) = HIGH;
+
+    elseif (X(ind) < -HIGH)
+      Y(ind) = -HIGH;
+
+    else 
+      Y(ind) = X(ind);
+
+    end
+  end
+  
+  Y = fftshift(Y); %Shifts Y.
+  y = ifft(Y); %Inverse Fourier Transform of Y.
+  y = real(y); %Stores only the real part of the complex y.
+
+end

src/generate_cosine.m

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+function x = generate_cosine(amplitude, frequency, phase, fs, duration, duty)
+% GENERATE_WAVENAME: returns a matrix of sampled WAVENAME wave
+
+% CONTRIBUTORS:
+% Mekhi Ellington: Original Creator
+
+% DOCUMENTATION:
+% phase shift is in number of periods
+% fs is the sampling frequency: how many sample points per second
+% duration is time in seconds
+% duty is a number between 0 and 1
+
+    % initialize local variables from input arguments
+    n = fs * duration; % number of samples (length of matrix)
+    dt = 1 / fs; % sampling period: time between two sample points
+    
+    % initialize a one dimensional zero matrix to be populated
+    x = zeros(1, n);
+    
+    % populate the matrix
+    for i = 1:n
+        t = i * dt;
+        x(i) = amplitude * cos(2*pi*frequency*t-phase);
+    end
+end