Writing an audio file

Question

Yanjika O 2020-6-26

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/555031-writing-an-audio-file

评论： Yanjika O 2020-6-26

Dear people,

I am trying to write an audio which consists of part of 2500Hz 17 sec long and another silent part of 1 min in length.

FrequencySampling = 2500;                                     
duration = 17;
repeats=5;
filename='shock.wav';
t  = linspace(0, duration, FrequencySampling*duration+1);      
t(end) = [];                                                   
w = 2*pi*1000;                                                                          
                                                              
for i=1:repeats
    for k=1:duration
        s = sin(w*t);
        sound(s,FrequencySampling);
    end
    pause(77);                                                
end
audioWrite(filename,s,FrequencySampling);

When I use this code I am only able to write it for single 17 sec long 2500Hz tone. I want to inlcude 4 silent periods between 5 repeats of 17 sec long 2500Hz tone. How to do it? Please suggest.

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Answer 1

Walter Roberson 2020-6-26

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/555031-writing-an-audio-file#answer_457327

在 MATLAB Online 中打开

FrequencySampling = 2500;                                     
duration = 17;
repeats = 5;
filename='shock.wav';
s = cell(2, repeats);
t  = linspace(0, duration, FrequencySampling*duration+1);      
t(end) = [];                                                   
w = 2*pi*1000;
n = sin(w*t);
z = zeros(1, 77*FrequencySampling);
s(1,:) = {n};
s(2,:) = {z};
s(end) = [];    %delete final silence
s = horzcat(s{:});
audioWrite(filename, s, FrequencySampling);