Audio comperession with arm

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Hi I wrote a program to take samples of the sound signal with lpc1768
but
to reach Good quality sample rate should be take at least 40 to 50 k samples is that each sample is 12 bits so the volume occupies is too much
So I need to use an algorithm or library that can compress it for me
i looking for a library and
but I do not know how to use this library for lpc1768
Now is there anyone here who can help me?!

What I have tried:

i find mini lzo and lame mp3 encoder
but lame is heavy for lpc1768
and don't know how to use mini lzo

Posted 2-Dec-16 5:21am

Member 12814209

Updated 2-Dec-16 7:33am

Sean Ewington

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Rick York · Answer 1 · 2016-12-02T05:38:00

Solution 1

Have a look at Zlib. It is used for PNG image compression and is lossless. Plus, you can find the source code written in plain, old C. It is capable of in-memory compression so it should be able to do exactly what you want.

Posted 2-Dec-16 5:38am

Rick York

CPallini · Answer 2 · 2016-12-02T06:55:00

Solution 2

You may use a mp3 decoding library, see this paper: "Audio Player Design Example"[^] though, at first glance it looks you need a more powerful chip.

Posted 2-Dec-16 6:55am

CPallini

Dave Kreskowiak · Answer 3 · 2016-12-02T07:33:00

How long of a sample do you think you're going to fit in 32KB of RAM? I certainly hope you're offloading the storage of this sample to something else besides the uC or are streaming the samples to a PC or something bigger.

If you're not, you are going to need to move up to a bigger uC with more memory or storage.