Removing spikes from signal

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Hasan shovon
Hasan shovon 2018-4-12
Consider the open-loop voltage across the input of an analog instrument in the presence of 60 Hz power-line noise. The sample rate is 1 kHz.
load openloop60hertz
%%code
load openloop60hertz;
fs = 1000;
t = (0:numel(openLoopVoltage) - 1)/fs;
% % Corrupt the signal by adding transients with random signs at random points. Reset the random number generator for reproducibility.
% code
rng default
spikeSignal = zeros(size(openLoopVoltage));
spks = 10:100:1990;
spikeSignal(spks+round(2*randn(size(spks)))) = sign(randn(size(spks)));
noisyLoopVoltage = openLoopVoltage + spikeSignal;
plot(t,noisyLoopVoltage)
xlabel('Time (s)')
ylabel('Voltage (V)')
title('Open-Loop Voltage with Added Spikes')
i have not understand why spikeSignal(spks+round(2*randn(size(spks)))) = sign(randn(size(spks))); is used ??

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