Multiplication of sound and sinusoidal signal

Question

ali okumus 2018-12-18

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/436286-multiplication-of-sound-and-sinusoidal-signal

评论： Oswaldo Colin Martinez 2020-11-26

clc;
[a,Fs]=audioread("music.wav");
%sound(a,Fs);
si=size(a);
t=si/Fs;
t2=0:1/Fs:1;
f=15000;
signal=sin(2*pi*f*t2);
A=a';
K=A*signal;
When i try to multply i got an error . idont know what to do ?

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Jan 2018-12-18

If you get an error message and want the forum to help you, it is useful to post a copy of the complete message. It is easier to solve a problem than to guess, what the problem is.

Note that size(a) replies a vector. This is not a problem here, because t is not used anywhere.

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Answer 1

Omer Yasin Birey 2018-12-18

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/436286-multiplication-of-sound-and-sinusoidal-signal#answer_352925

编辑：Omer Yasin Birey 2018-12-18

在 MATLAB Online 中打开

The problem here is you take the t2 until 1 second, when your sound lasts more (or less) than 1 second

t2=0:1/Fs:1;

However it must last until the duration not until 1. Therefore, change this line with

t2=0:1/Fs:duration;

And also I believe you want to do element wise multiplication so put a dot before the multiplication sign.

clc;
[a,Fs]=audioread('music.wav');
duration = length(a)./Fs;
si=size(a);
t=si/Fs;
t2=0:1/Fs:duration-1/Fs;
f=15000;
signal=sin(2*pi*f*t2);
A=a';
K=A.*signal;

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ali okumus 2018-12-18

Thank you very much .I really appreciated your help .it worked for me .

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Answer 2

Jan 2018-12-18

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/436286-multiplication-of-sound-and-sinusoidal-signal#answer_352931

编辑：Jan 2018-12-18

在 MATLAB Online 中打开

I guess, you want this:

[a, Fs] = audioread('music.wav');
len     = size(a, 1);
t       = (0:len - 1) / FS;  % time in seconds
freq    = 15000;
signal  = sin(2 * pi * freq * t);
result  = a .* signal.';

This multiplies even stereo signals, but you need >= R2016b for the auto-expanding. Please ask, if you use an older Matlab version.