How can i add echo to a signal

Question

Ijeoma Madu 2012-12-1

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https://ww2.mathworks.cn/matlabcentral/answers/55378-how-can-i-add-echo-to-a-signal

评论： Priyamvada Shankar 2019-3-24

I want to add echo to a signal

load handel

how do i add echo to this

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Ijeoma Madu 2012-12-9

echo

Henry Solderless 2018-11-30

also if you want you can define the vector (1:size)

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Answer 1

Vieniava 2012-12-1

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https://ww2.mathworks.cn/matlabcentral/answers/55378-how-can-i-add-echo-to-a-signal#answer_67211

在 MATLAB Online 中打开

load handel;
echo_delay   = 0.5;                    % in seconds
echo_delay_s = round(echo_delay*Fs);   % delay in samples
echo_gain    = 0.1;                    % to control a linear gain of an echo
y_echoed     = y + [zeros(echo_delay_s-1, 1); y(echo_delay_s:end)];

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Perturabo 2019-2-8

I have to make an echo generator too but the instructions say nothing about the phase difference; Just input, Fs,delay and gain. When i test it on various inputs it just says

Variable output must be of size [10820 1]. It is currently of size [73113 1]. Check where the variable is assigned a value

When using the above function.

Priyamvada Shankar 2019-3-24

@Perturabo please tell me, if you get the correct code.. I'm too stuck in this situation..so please help

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Answer 2

Vieniava 2012-12-2

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https://ww2.mathworks.cn/matlabcentral/answers/55378-how-can-i-add-echo-to-a-signal#answer_67255

编辑：Vieniava 2012-12-2

在 MATLAB Online 中打开

For example: to add an echo after 1s (with amplitude=0.1, phase=pi/3.5) and echo after 1.5 seconds (with a=0.5 and phase=1.2*pi) you can use the following code:

echo_vector=[1                  zeros(1,Fs)     ... 
             0.1*exp(1i*pi/3.5) zeros(1,1.5*Fs) ... 
             0.5*exp(1i*1.2*pi)                   ];
yecho=real(conv(y,echo_vector);

Using echo_vector that way you have full control of an echo creation.