multiplying audio signal by using Matlab
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I have an audio signal ( of my voice ) .However,I want to multiply it by cosine function.
t=[1:1000];
n=cos(2*pi*fc*t);
[y fs]=audioread('message.wav');
How can I do that ?
采纳的回答
Star Strider
2020-3-24
The cosine signal must be the same size as ‘y’.
One way to define it as such:
t = linspace(0, 1, fs);
Then create the cosine funciton to be what you want.
Try this:
t = linspace(0, 1, fs);
fc = 440;
n=cos(2*pi*fc*t).';
y_new = y .* n;
sound(y_new,Fs)
6 个评论
Gentle EE
2020-3-24
Star Strider
2020-3-24
Try this:
y_new = bsxfun(@times, y, n);
The size of ‘y’ was not specifically stated.
Gentle EE
2020-3-24
Star Strider
2020-3-24
Then define ‘t’ as:
t = linspace(0, 1, size(y,1));
That will equalise their lengths. You will need to define your cos call correctly to produce the result you want.
One possibility that may make that easier:
t = linspace(0, 1, size(y,1))/fs;
Experiment to get the result you want.
Remember that the cos call must produce a column vector.
The easiest way to do that is to use the (:) subscript convention to force ‘t’ to be a column vector:
n=cos(2*pi*fc*t(:));
This assumes that ‘fc’ is a scalar.
Gentle EE
2020-3-24
Star Strider
2020-3-25
As always, my pleasure!
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