Extract human sound from a wav file using java

I am working on a project where I have to extract the human sound from a audio .wav file using java.

The audio .wav file may have 3 to 4 sounds like dog, cat, music and human. I will have to identify the human sound then exatract that part from the audio .wav file.

I am using FFT.java and Complex.java.

Now I have written an AudioFileReader class which reads the audio.wav file from the hard-drive and then convert this to bytes array. Then used the above mentioned FFT.java and Complex.java to apply FFT.fft(bytesArray), which gives me Complex array in return;

Now the problem is how to extract the human sound byte pattern from the returned Complex array... does anyone know how I might be able to achieve this?

Edit: We are assuming a very simple audio.wav file. For example, cat sound then silence, human sound then silence, dog sound then silence etc. No mixture of voices.

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I think the standard way to handle problems like this are to convert the input signals into a Cepstrum or Mel-Cepstrum representation and then use the coefficients for the feature space for input into a classifier. There are many research papers that discuss solutions to these sorts of problems based on this basic approach, for example:

http://www.ics.forth.gr/netlab/data/J17.pdf

One possible shortcut you might try would be to put the input signals through a low bit-rate vocoder such as AMBE, then decode, and compare the quality of the original signal to the encoded/decoded signal. These vocoders are designed to highly compress human speech with fair to good quality at the expense of not being able to adequately represent non-speech sounds.

answered 2011-03-24T14:52:59.790

Extract human sound from a wav file using java

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