MATLAB: Plot time of audio file in milliseconds

milliseconds

Hi there,

I have imported a .wav file into MATLAB, I am plotting this audio file in amplitude/time but I need it to be displayed in milliseconds rather than seconds.

The .wav file is configured in the workspace as data and fs.

The code I am using to plot the file in time is :

>> t=[0:length(data)-1] / fs;

>> plot(t, data);

Many thanks in advance for your time.

Best Answer

Try this:

plot(t*1E+3, data);

That converts seconds to milliseconds. The plot otherwise remains the same.

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Much of your code is ‘over the horizon’ and so out of sight.

Try something like this:

x = 0:500;                                                          % Create Data

y = randn(size(x));                                                 % Create Data
figure
plot(x, y)
xt = get(gca, 'XTick');                                             % Original 'XTick' Values
xtlbl = linspace(-150.36, 265.8773, numel(xt));                     % New 'XTickLabel' Vector

set(gca, 'XTick',xt, 'XTickLabel',xtlbl, 'XTickLabelRotation',30)   % Label Ticks

I know you are displaying an image, not data, however this should work. Note that you need to define the location of the x-tick labels with respect to the original x-tick values. They do not have to be the actual x-tick values (as I use here), however they must be within that range.

Something like this would also work:

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Note that ‘xtnew’ spans the original ‘xt’ range. It just defines them differently.

MATLAB: How to show a seconds plot axis ticks as hh:mm

Try this:

X = -10800:10:+10800;
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figure
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I created ‘signal’ to test the code. This works as desired in R2020a.

Best Answer

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MATLAB: Create custom x-axis for ‘imagesc’ plot

MATLAB: How to show a seconds plot axis ticks as hh:mm

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