MATLAB question: I have a wav file that consists of a non-ideal sinusiodal signa

Question

MATLAB question:

I have a wav file that consists of a non-ideal sinusiodal signal saved in the variable "wave" using [wave,fs] = audioread('filename')

My carrier signal is a cosine  cos(10000*2*pi*i)

I need to multiple my wave with the carrier signal like so: v2 = cos(10000*2*pi*i)*wave;

However if I do this or even this: v2 = cos(10000*2*pi*i).*wave;

I get an error of "Inner matrix dimentions must agree"

I must eventually AM modulate my wav file, so this is the first step in getting there. Is it possible to apply a carrier signal to the wav file. If so, what am I doing wrong?

Explanation / Answer

here the duration of the wave file or, the voice signal is T=length(wave)./fs.

for your carrier wave take the time lapse is T

and time indices are

t=0:1/fs:T;

then the length of the 'wave' vector and the carrier wave vector will be equal.

Now multiply both by writing

V2=wave.*V1

V1 is carrier signal .

then you get no error

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