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Separate words in a sentence.

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i Venky
i Venky 2011-10-19
评论： Image Analyst 2018-12-29
I am doing speech recognition. I don't have any problem with classifying the words but I don't know how to separate the words in a sentence.
For eg: When I say "How are you?" I want to separate that to "how", "are" and "you" so that I proceed with the processing part (which is pattern recognition).
How would you separate the words in a sentence? I need the code for that.
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Daniel Shub
Daniel Shub 2011-10-19
What language are you dealing with? What is the approximate SNR of the recordings. Is there substantial reverberation? It is natural speech or where the talkers instructed to speak clearly?

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回答（3 个）

the cyclist
the cyclist 2011-10-19
The isspace() command might be good enough for what you need. If not, there is also the regexp() command, which you can use to do regular-expression matching.
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Image Analyst
Image Analyst 2018-12-29
aya, did you click the link to the left: Search for tag "speech to text"
You'll probably find something in one of the other answers.

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Walter Roberson
Walter Roberson 2011-10-19
The solution depends upon the language involved. In "western" languages, word boundaries are marked by short pauses. There are, however, languages which do not use pauses for that purpose, and instead rely upon tone patterns or stress patterns. And watch out for "glottal stops" and clicks, as those may involve pauses that do not mark word boundaries.
Daniel Shub
Daniel Shub 2011-10-19
As a first stab you could look at the running RMS power averaged over a short (20 ms) time window. Periods of low power are more likely to be inter-word gaps.
Prms = sqrt(conv(x.^2, ones(Fs*0.01, 1)));
You could also look at the envelope of the speech waveform. You can get the envelope via the Hilbert transform.
Even better would be to use your speech identifier to help identify word boundaries. If the identifier is good, but fails on a chunk of speech, the boundary is probably in the wrong place.

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