Płot sample of signal

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Elzbieta
Elzbieta 2024-11-13
回答： Star Strider 2024-11-13

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

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回答（2 个）

Star Strider
Star Strider 2024-11-13
Ran in:
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)')
.
Manikanta Aditya
Manikanta Aditya 2024-11-13
Ran in:
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.

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