8bit PCMU Encoder/Decoder

Question

I have 16 bit PCM audio and I want to convert it to 8bit PCMU. As far as I know 16bit to 8 bit conversion is easy - just drop the last 8 bits from each sample.

I want to know how to convert 8 bit pcm to 8 bit pcmu? Any article or sample code will be great!

This is for a mobile platform where no ready-to-use frameworks are available so I will need to do that with custom implementation.

score 3 · Accepted Answer · edited Feb 27 '20 at 21:10

3

Check the wikipedia article regarding the μ-law algorithm .

At the bottom it mentions this article where the author shows how to compress 16 samples to 8 bit PCMU samples in C code. Porting that code to Java is trivial.

edited Feb 27 '20 at 21:10

omikes

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answered Apr 27 '11 at 11:20

jassuncao

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You may also find this article useful: http://www.cs.columbia.edu/~hgs/audio/dvi/IMA_ADPCM.pdf – Code Painters Apr 27 '11 at 11:24

8bit PCMU Encoder/Decoder

1 Answers1