Need compression method on MCU

[leilarazavi2000]

Hi all

I need simple code or algorithm to compression method on MCU

Guess we have 20 KB data on ram . and I want to compress it to smaller size of data . ( like zip)

How can I do?

I need fastest method ( please !)

 

[leilarazavi2000]

any link or help please ?

 

[SuperUser]

Give more details about your project
What kind of data do you want to compress (text, sound, images)? And do you want to be able to compress & decompress the data in the microcontroller or only to decompress it (the compression to be done in a PC)?
The choice of the optimal algorithm depends on the answers of the above questions. And note that the fastest algorithms achieve lower compression ratio.

 

[leilarazavi2000]

Give more details about your project
What kind of data do you want to compress (text, sound, images)? And do you want to be able to compress & decompress the data in the microcontroller or only to decompress it (the compression to be done in a PC)?
The choice of the optimal algorithm depends on the answers of the above questions. And note that the fastest algorithms achieve lower compression ratio.

I want to record sound on mmc ram , but I want to compress it to smaller size then write it to mmc .

Yes , I want to be able to compress & decompress the data in the microcontroller

thank you

 

[SuperUser]

The most suitable compression algorithm for you is IMA-ADPCM. It can be easily implemented in a small microcontroller. The IMA-ADPCM algorithm takes 16-bit samples and compress them down to four bits each, that is 4:1 compression ratio.
The compression is lossy and the reconstructed sound is not identical to the original. There are a lot of different audio and speech compression algorithms which achieve better compression and quality, but they require DSP or powerful microcontrollers.

 

[Beowolf]

isn't it easier just to buy bigger mmc? they are extreemly cheap.