Skip to content

Loundness filter for BlueMp3

Last updated on 2007-04-12

I wrote an extension to the [BlueMp3](http://www.bluemp3.de/) firmware. Now you can use an loudness filter on the mp3-player. After reading the [VS1001](http://www.vlsi.fi/vs1001/vs1001.shtml) [specs](http://www.vlsi.fi/datasheets/vs1001.pdf), the [BlueMp3](http://www.bluemp3.de/) mp3-decoder, i noticed that it’s possbile to upload code to the dsp.This code can manipulate the current mp3 stream, so perfect for a loundness filter. I worked through the [VS1001](http://www.vlsi.fi/vs1001/vs1001.shtml) [application note]( http://www.vlsi.fi/datasheets/vs10XXan.pdf) and wrote some routines to upload that [VS1001](http://www.vlsi.fi/vs1001/vs1001.shtml) code to the chip. Then i integrated that routines into the [BlueMp3](http://www.bluemp3.de/) firmware. There is patch available for the 1.8 firmware but also the binary 2.5 firmware includes the loundness filter code.

[patch firmware 1.8](http://optixx.org/download/patch_firmware.gz)

[patch client 1.8](http://optixx.org/download/patch_client.gz)

[binary 2.4](http://www.beecon.de/projekte/BlueMP3-ct/BlueMP3-Firmware-Full_2.5.zip)

One Comment

  1. I am so happy that I found this site, because its the best.

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.