Płot sample of signal

How to plot 20s sample signal of the overall signal counting 300000samples with sampling frequency 1000 sample per second?

Answer 1

[Manikanta Aditya]

Hi,

Please refer to the following script to plot a 20-second sample of a signal with a total of 300,000 samples and a sampling frequency of 1000 samples per second:

% Define parameters
total_samples = 300000;
sampling_frequency = 1000; % in Hz
duration = 20; % in seconds

% Generate a time vector for the entire signal
t = (0:total_samples-1) / sampling_frequency;

% Generate a sample signal (for example, a sine wave)
signal = sin(2 * pi * 5 * t); % 5 Hz sine wave

% Extract the 20-second sample
sample_duration = 20; % in seconds
sample_samples = sample_duration * sampling_frequency;
sample_signal = signal(1:sample_samples);
sample_time = t(1:sample_samples);

% Plot the 20-second sample
figure;
plot(sample_time, sample_signal);
xlabel('Time (s)');
ylabel('Amplitude');
title('20-Second Sample of the Signal');
grid on;

Hope this helps.

Answer 2

[Star Strider]

The number of samples you need to plot is equal to the sampling frequeency multiplied by the number of seconds.

Fs = 1000;
td = 20;
nr_samples = Fs * td

nr_samples = 20000

t = linspace(0, 300000-1, 300000)/Fs;
s = sin(2*pi*t/20) .* cos(2*pi*t/5);

figure
plot(t,s)
xlabel('Time')
ylabel('Amplitude')
title('Entire Signal')

v = 1:nr_samples;

figure
plot(t(v),s(v))
xlabel('Time')
ylabel('Amplitude')
title('20s Signal')

Lv = (t >= 0) & (t<=20);                % Use Time Vector To Select Part Of The Signal You Want To Plot

figure
plot(t(Lv),s(Lv))
xlabel('Time')
ylabel('Amplitude')
title('20s Signal (Logical Subscript)')

.