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Add echo to audio signal in matlab

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Priyamvada Shankar
Priyamvada Shankar on 24 Mar 2019
Edited: Mohamed Gsmal on 16 Jan 2021
Write a function called echo_gen that adds an echo effect to an audio recording. The function is to be called like this: output = echo_gen(input, fs, delay, amp); where input is a column vector with values between -1 and 1 representing a time series of digitized sound data. The input argument fs is the sampling rate. The sampling rate specifies how many samples we have in the data each second. For example, an audio CD uses 44,100 samples per second. The input argument delay represent the delay of the echo in seconds. That is, the echo should start after delay seconds have passed from the start of the audio signal. Finally, amp specifies the amplification of the echo which normally should be a value less than 1, since the echo is typically not as loud as the original signal. The output of the function is a column vector containing the original sound with the echo superimposed. The output vector will be longer than the input vector if the delay is not zero (round to the nearest number of points needed to get the delay, as opposed to floor or ceil). A sound recording has values between -1 and 1, so if the echo causes some values to be outside of this range, you will need to normalize the entire vector, so that all values adhere to this requirement. MATLAB has several sample audio files included that you can try: splat, gong, and handel are a few examples. Try the following: load gong % loads two variables, y and Fs sound(y, Fs) % Outputs sound

Answers (3)

Priyamvada Shankar
Priyamvada Shankar on 24 Mar 2019
They are not working

  22 Comments

Walter Roberson
Walter Roberson on 16 Aug 2019
Mukti Awad: those messages come from an academic code grading system. You are responsible for writing your own code for assignments. If you present your own code and it is not just a copy of the above code, then someone might be willing to have a look at it.
Washida Kami
Washida Kami on 1 Apr 2020
@Walter Roberson Nobody asked for your help, why do you sound so pissed off in all the comments?
Walter Roberson
Walter Roberson on 1 Apr 2020
Washida Kami:
Nobody asked for your help
Priyamvada Shankar and Mukti Awad asked for my help.
why do you sound so pissed off in all the comments?
The first ten thousand times that someone asked me to do their homework for them: they were the worst. The second ten thousand times: they were the worst too. After that, things started to go downhill.

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Sarthak Shukrey
Sarthak Shukrey on 24 Jul 2019
can someone provide with a descriptive answer for the same ? I'm getting same error :(

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ABHIJIT BISWAS
ABHIJIT BISWAS on 30 Nov 2020
Edited: ABHIJIT BISWAS on 30 Nov 2020
%Perfectly working
function echo_sound = echo_gen(input, fs, delay, amp)
new_sr = round(fs*delay);
no_echo = [input; zeros(new_sr,1)];
echo_effect = [zeros(new_sr,1); input*amp];
echo_sound = no_echo + echo_effect;
norm_factor = max(abs(echo_sound));
if norm_factor > 1
echo_sound = echo_sound./norm_factor;
end

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