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AlexNguyenJJ 2021-12-09 14:29:25 -08:00
parent f241f1d616
commit 9d49868c0d
1 changed files with 10 additions and 7 deletions
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17
src/generate_heartbeat.m
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@ -9,11 +9,14 @@ function x = generate_heartbeat(amplitude, frequency, phase, fs, duration, duty)
% phase shift is in number of periods
% fs is the sampling frequency: how many sample points per second
% duration is time in seconds
% duty cycle should be a number between 0 and 1.
% duty of 0 or less would return -amplitude for all sample points
% duty of 0.25 would return +amplitude for first quarter of each cycle
% then return -amplitude for the remaining three-fourths
% duty of 1 would return all +amplitude
% duty cycle should be a number between 0 and 0.5.
% duty of 0 or less would return 0 for all sample points
% duty of 0.5 or less would return a heartbeat signal since there would be
% equal amount of space within 1 period to have the right and left sides be equal
% duty of greater than 0.5 but less than 1 would return a slope starting at that duty i.e.
% the left side but leaving little room to the right side
% duty of between 1 and 2 would give a sawtooth wave in the +amplitude.
% duty greater than 2 would return 0 for all sample points
% initialize local variables from input arguments
@ -29,11 +32,11 @@ function x = generate_heartbeat(amplitude, frequency, phase, fs, duration, duty)
t = i * dt; % time at the i'th sample
st = mod(frequency * t - phase, 1);
if (duty-0.25 < st && st < duty)
if (duty-(duty / 2) < st && st < duty)
slope = amplitude / duty;
intercept = -0.5 * amplitude;
x(i) = slope * st + intercept;
elseif (duty < st && st < duty+0.25)
elseif (duty < st && st < duty+(duty / 2))
slope = amplitude / duty;
intercept = -amplitude;
x(i) = slope * st + (1.5 * intercept);