Matrix dimensions must agree

¡Greetings to everyone!

I am trying to make a project of mixing an audio signal with an echoed white noise signal, but have the "Inner Matrix Dimensions Must Agree" at the moment of getting the transfer function.

I am gently asking for assistance.

Thank you all in advance.

The shown error is the following:

Error using / Matrix dimensions must agree.

Error in RuidoBlanco (line 24) H = eco_f/ruido_f;

And here is my code:

fs = 48000;     
tSpan = 10;
t = 0:1/fs:tSpan-1/fs;
sam = size(t,2);

mu = 0;        
sigma2 = 0.1;     
dst = sqrt(sigma2);    
var_dB = 10*log(sigma2); 

X = dst*randn(sam,1)+mu;    

ruido = int16(X/max(abs(X))*2^15-1);

archivo = 'RuidoBlanco.wav';  
audiowrite(archivo, ruido, fs); 
[ruidoeco, feco] = audioread('ruido_eco.wav'); 
[audio, faud] = audioread('audio.wav'); 

audio_f = abs(fft(audio));
ruido_f = abs(fft(ruido));
eco_f = abs(fft(ruidoeco));

H = eco_f/ruido_f;

audioeco = conv(H, audio_f);

audio_eco = ifft(audioeco);

audiofi = int16(audio_eco/max(abs(audio_eco))*2^15-1);

archivo = 'Final.wav'; 
audiowrite(archivo, audiofi, fs);    

Answer 1

[Walter Roberson]

The operator A/B is roughly A * pinv(B) where * is "inner product" (matrix multiplication). But / has more restrictions than that summary would suggest.

If you want to divide corresponding elements of two vectors or arrays then use the division operator which is ./ not /

[Oscar Francisco Barba Toscano]

Thanks for the help of the explanation. It helped me also to solve a further problem.

¡Really appreciate your answer!