Generating an Echo for an Audio Signal using Convolution

[y,Fs] = audioread('Test1.wav');

delay=0.8*Fs; %Delay

attenuation_factor=0.4;

h=zeros(1,delay);%Impulse

h(delay)=attenuation_factor; %Impulse at delay

z=conv(y,h); %Convolution

sound(z,Fs)

The produced sound doesn't include the desired echo, and not sure why so. I would apprechiate the help

Answer 1

[Prakash S R]

z is simply the delayed input (echo). You forgot to add echo to the input! You are listening to the echo component only, not sound + echo

[Abdelrhman Abdelfatah]

i just noticed my mistake, thanks

Answer 2

[mariam]

[y,Fs] = audioread('Test1.wav');

delay=0.8*Fs; %Delay

attenuation_factor=0.4;

h=zeros(1,delay);%Impulse

h(delay)=attenuation_factor; %Impulse at delay

z=conv(y,h); %Convolution

sound(z,Fs)