How to cut audio file into segments?

Question

Lara Lirnow 2017-2-5

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/323480-how-to-cut-audio-file-into-segments

回答： Rahul 2025-1-3

I have an audio file (.wav) which I need to cut into segments. Segments (start and stop values) are stored in cell array C. I managed to get values only from one cell to cut the sound file, but I don't know how to get one by one values from cell array C and parallel cut the sound signal. Intervals in the text file look like this:

0.300000 0.410000 ,0.41000 0.430000 ,0.95000 0.990000 ,1.21500 1.260000 ,...

In cell array C every interval is in it's own cell -

'0.300000 0.410000', '0.41000 0.430000' , ...

I have this code:

 [data,Fs] = audioread('sound.wav');
 list = fopen('intervals.txt','r');
 for k=1:length(list)
    content = fgets(list)
    C= strsplit(content,',')% splits str at the delimiters specified by delimiter
    nums = C{1,k} % gets only data from the first cell
    x = str2num(nums) %convert from char to numeric value
    for n=1:length(x)
        start=x(1) 
        stop=x(2) 
        N = length(data);
        totaldur = N/Fs; % total duration
        t = linspace(0,totaldur,N); % create a time vector
        %logical indexing 
        seg1 = data(t>start & t<stop)
        sound(seg1) %play the segment
    end
end

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Answer 1

Rahul 2025-1-3

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https://ww2.mathworks.cn/matlabcentral/answers/323480-how-to-cut-audio-file-into-segments#answer_1556859

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Hi @Lara Lirnow,

As per the code shared, in order to apprpriately cut the audio signal into segments as per the specified list of intervals, consider indexing the data in the following way:

[data, Fs] = audioread('sound.wav'); 
list = {'0.300000 0.410000', '0.41000 0.430000' , ...} 
for k = 1:length(list)
    interval = list{k}; 
    x = str2num(interval); 
    if length(x) == 2 
        start = x(1); 
        stop = x(2); 
        startIdx = max(1, floor(start * Fs)); 
        stopIdx = min(length(data), ceil(stop * Fs)); 
        segment = data(startIdx:stopIdx); % Indexing appropriately taking Fs(Sampling frequency) into account
        sound(segment, Fs); % Fs(Sampling frequency) helps in obtaining the correct aound output.
        
    end
end