Converting and segmenting a collection of 44100hz, 16-bit mono wav files into 16kHz, 16-bit mono wav files

Question

I need to break apart a large collection of wav files into smaller segments, and convert them into 16 khz, 16-bit mono wav files. To segment the wav files, I downloaded a WavFile class from the following site: WavFile Class . I tweaked it a bit to allow skipping an arbitrary number of frames. Using that class, I created a WavSegmenter class that would read a source wav file, and copy the frames between time x and time y into a new wav file. The start time and end time I can get from a provided XML file, and I can get the frames using sample rate * time . My problem is I do not know how to convert the sample rates from 44,100 to 16,000.

Currently, I am looking into Java's Sound API for this. I didn't consult it initially, because I found the guides long, but if it's the best existing option, I am willing to go through it. I would still like to know if there's another way to do it, though. Finally, I would like to know whether I should completely adapt Java's Sound API, and drop the WavFile class I am currently using. To me, it looks sound, but I would just like to be sure.

Thank you very much, in advance, for your time.

Answer 1

I believe the hardest part of your task is re-sampling from 44.1K to 16K samples per sec. It would have been much simpler to downsample to 22K or 11K from there. You will need to do some interpolation there.

EDIT: After further review and discussion with OP I believe the right choice for this situation is to go with Java Sound API because it provides methods for conversion between different sound file formats, including different sampling rates. Sticking with the WavFile API would require re-sampling which is quite complicated to implement in a 44.1K to 16K conversion case.

Answer 2

http://www.jsresources.org/examples/SampleRateConverter.html . I suppose This would help you...