i have a erorr with echo when i use soundsc command

Question

Mohammed Alqahtany 2023-11-25

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2051967-i-have-a-erorr-with-echo-when-i-use-soundsc-command

回答： Walter Roberson 2023-11-25

% Step 1: Load the audio file echo.mat
load('echo.mat');
% Step 2: Run the audio file using soundsc function
fs = 22050; % Sampling frequency
soundsc(echo, fs);
% Step 3: Plot the audio file
t = (0:length(echo)-1) / fs;
figure;
plot(t, echo);
xlabel('Time (s)');
ylabel('Amplitude');
title('Original Audio File');
% Step 4: Generate impulse response
impulse_response = zeros(size(echo));
impulse_response(1) = 1;
impulse_response(round(3/4 * length(impulse_response))) = 0.25;
% Step 5: Convolve the audio signal with the impulse response
convolved_signal = conv(echo, impulse_response);
% Step 6: Plot the signals
figure;
subplot(3, 1, 1);
plot(t, echo);
xlabel('Time (s)');
ylabel('Amplitude');
title('Original Audio File');
subplot(3, 1, 2);
plot(t, impulse_response);
xlabel('Time (s)');
ylabel('Amplitude');
title('Impulse Response');
subplot(3, 1, 3);
convolved_t = (0:length(convolved_signal)-1) / fs;
plot(convolved_t, convolved_signal);
xlabel('Time (s)');
ylabel('Amplitude');
title('Convolved Signal');
% Step 7: Play the convolved signal
soundsc(convolved_signal, fs);

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Mohammed Alqahtany 2023-11-25

this (Error using echo

Too many output arguments.) come out when i evaluate soundsc

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Answer 1

Stephen23 2023-11-25

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https://ww2.mathworks.cn/matlabcentral/answers/2051967-i-have-a-erorr-with-echo-when-i-use-soundsc-command#answer_1359642

编辑：Stephen23 2023-11-25

在 MATLAB Online 中打开

MATLAB has a function named ECHO, which has no output arguments:

https://www.mathworks.com/help/matlab/ref/echo.html

This is what your script is calling.

You think that you are accessing a variable named ECHO, but that is not what is happening (in fact MATLAB's code parser finds your reference to ECHO, looks to see if you have defined a variable with that name, cannot find one... and so searches for functions with that name. And it finds the function ECHO). This is explained here:

https://www.mathworks.com/help/matlab/import_export/troubleshooting-loading-variables-within-a-function.html

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval#answer_274740

There are several ways to resolve this, the best approach is to call LOAD with an output argument:

S = load(..)

and then access the fields of S, e.g. if there really is a field named ECHO:

S.echo

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Mohammed Alqahtany 2023-11-25

Sorry, but I don't understand what you mean

Stephen23 2023-11-25

在 MATLAB Online 中打开

"but I don't understand what you mean"

Okay, here is another solution (without any explanation). Replace this:

load('echo.mat');

with this:

load('echo.mat','echo');

Try it.

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Answer 2

Walter Roberson 2023-11-25

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链接

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https://ww2.mathworks.cn/matlabcentral/answers/2051967-i-have-a-erorr-with-echo-when-i-use-soundsc-command#answer_1359712

在 MATLAB Online 中打开

% Step 1: Load the audio file echo.mat
filename = 'echo.mat';
datastruct = load(filename);
if ~isfield(datastruct, 'echo')
    error('file "%s" does not contain variable named echo', filename);
end
echo = datastruct.echo;