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Fix the equation for generating sawtooth wave

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fix the equation for generating sawtooth wave
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Ben Zhang 2021-12-05 20:53:41 -08:00 committed by GitHub
parent 74978464b5
commit d2e2bac659
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1 changed files with 6 additions and 3 deletions
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src/generate_sawtooth.m
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@ -20,19 +20,22 @@ function x = generate_sawtooth(amplitude, frequency, phase, fs, duration, duty)
% initialize a one dimensional zero matrix to be populated % initialize a one dimensional zero matrix to be populated
x = zeros(1, n); x = zeros(1, n);
% populate the matrix % populate the matrix
for i = 1:n for i = 1:n
t = i * dt; % time of the i'th sample t = i * dt; % time of the i'th sample
st = mod(frequency * t - phase, 1); % Progression through cycle st = mod(frequency * t - phase, 1); % Progression through cycle
slope = 2 * amplitude / period; % the incline slope from start to amplitude slope = 2 * amplitude / period; % the incline slope from start to amplitude
mid = period / 2;
%part before the straght vertical line %part before the straght vertical line
if(st < period /2) if(st < mid)
x(i) = slope * st; x(i) = slope * st;
%part after the straght vertical line %part after the straght vertical line
else else
x(i) = slope * st - amplitude; x(i) = slope * (st - 0.5) - amplitude;
end end
end end