How to create a MATLAB code for generating audio sine wave signal of frequency ranges from 1Hz to 15kHz and plot it on real time.

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Zafar Ahmad
Zafar Ahmad on 28 Sep 2021
Edited: jibrahim on 7 Oct 2021
I use MATLAB for Engineering computations for almost 3 years, however I don't have any idea how to "How to create a MATLAB code for generating audio sine wave signal of frequency ranges from 1Hz to 15kHz and plot it on real time." I request the staff to help me in generating this code.

Answers (2)

Geoff Hayes
Geoff Hayes on 28 Sep 2021
Zafar - see the relevant parts of the noisy signal example on how to generate a sine wave with a particular frequency. You will need to determine how you transition between the different frequencies (or are they separate plots?) and what the "real time" component is.
  1 Comment
Zafar Ahmad
Zafar Ahmad on 29 Sep 2021
Sir, the example 'noisy signal' is about creating signal and it's Fourier transform etc, I want an audio tune signal having frequency ranges from 1Hz to 15kHz.

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jibrahim
jibrahim on 29 Sep 2021
Zafar, you can achieve this with audioOscillator and timescope. Here is an example.
% Generate and visualize a sine wave with variable frequency
osc = audioOscillator('sine');
scope = timescope('SampleRate',osc.SampleRate,...
'TimeSpanSource','property','TimeSpan',0.1, ...
'YLimits',[-1.5 1.5],...
'Title','Variable-Frequency Sine Wave');
counter = 0;
while (counter < 1e4)
counter = counter + 1;
scope(osc());
if mod(counter,1000)==0
osc.Frequency = osc.Frequency + 50;
end
end
  2 Comments
jibrahim
jibrahim on 7 Oct 2021
Hi Zafar,
If you want to generate a periodic signal based on a custom wave, then I suggest you take a look at wavetableSynthesizer.
If your signal is a long MATLAB vector, and you want to stream it, you can pass it one frame at a time to the for loop. Something like this:
x = randn(1e6,1); % let's say this is your signal
frameLength = 1024;
counter = 1;
while (counter < floor(size(x,1)/frameLength))
frame = x((counter-1)*frameLength+1:counter*frameLength);
counter = counter + 1;
scope(frame);
end

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