How to generate a bandpass signal in Matlab and sample it ?

I am trying to write a code that samples a bandpass signal with proper sampling frequency. I tried bandpass function but failed.

[Chunru]

What kind of bandpass signal? Random or deterministic?

[Abhishek]

Deterministic one

Answer 1

[Nithin Kumar]

Hi Abhishek,

I understand that you are facing an issue while generating a bandpass signal in MATLAB.

To generate a bandpass signal with proper sampling frequency using MATLAB, kindly refer to the following example:

fs = 1000; % sampling frequency in Hz
t = 0:(1/fs):1; % time vector
noise = randn(size(t)); % generating white noise with normal distribution
[b,a] = butter(2, [50/(fs/2), 200/(fs/2)], 'bandpass'); % generating filter coefficients for a 2nd order bandpass filter with a passband between 50Hz and 200Hz
x = filter(b,a, noise); % applying filter to noise signal
figure;
plot(t,x);
xlabel('Time (s)');
ylabel('Amplitude');
title('Bandpass Signal');

For more information regarding the "butter" and "filter" functions, kindly refer to the following documentation:

Butterworth filter design - MATLAB butter - MathWorks India

1-D digital filter - MATLAB filter - MathWorks India

I hope this answer helps you.