Separate words in audio file

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Michael Saniuk 2017-5-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/340214-separate-words-in-audio-file

回答： Michael Saniuk 2018-11-5

Hello, I am trying to separate words in an audio file, leaving only samples between red lines, with also having a variable with a border of each word:

I understand I can remove the silence between words using

envelope = imdilate(abs(y), true(1500, 1));
quietParts = envelope < 0.05;
y(quietParts) = [];

but this does leave me without knowing the boundary between each of these words.

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Arthur Goodhart 2018-11-2

Did you ever work out how to do this?

Michael Saniuk 2018-11-3

在 MATLAB Online 中打开

I posted this question 1.5 year ago but yes, I managed to do it myself.

[y, fs] = audioread(sprintf('test%d.wav', i));    
envelope = imdilate(abs(y), true(1500, 1));
quietParts = envelope > 0.01;
beginning = strfind(quietParts',[0 1]);
ending = strfind(quietParts', [1 0]);

With this code you can get boundaries between words but also between noises and sometimes the word gets separated.

In order to concatenate fragments of word into one full word, I had to detect parts where where is a very small distance between them and remove their corresponding endings/begginings:

eg. [b1 e1] [b2 e2] [b3 e3] are from the same word, 
distances between them are very small. 
I concatenate them and now I have a full word [b1 e3]

The last thing that might annoy us are the boundaries of noise that we do not want to be treated as a word! In order to get rid of them I calculated minimal length of a word in my dictionary and counted it as a minimal length for a detected word to be counted as a word.

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Answer 1

Michael Saniuk 2018-11-5

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/340214-separate-words-in-audio-file#answer_345325

在 MATLAB Online 中打开

Copying my comment to post it as an answer:

I posted this question 1.5 year ago but yes, I managed to do it myself.

[y, fs] = audioread(sprintf('test%d.wav', i));    
envelope = imdilate(abs(y), true(1500, 1));
quietParts = envelope > 0.01;
beginning = strfind(quietParts',[0 1]);
ending = strfind(quietParts', [1 0]);

With this code you can get boundaries between words but also between noises and sometimes the word gets separated.

In order to concatenate fragments of word into one full word, I had to detect parts where where is a very small distance between them and remove their corresponding endings/begginings:

eg. [b1 e1] [b2 e2] [b3 e3] are from the same word, 
distances between them are very small. 
I concatenate them and now I have a full word [b1 e3]

The last thing that might annoy us are the boundaries of noise that we do not want to be treated as a word! In order to get rid of them I calculated minimal length of a word in my dictionary and counted it as a minimal length for a detected word to be counted as a word.