Decoding MP3 with a controller w/out using any DSP just D/A

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Any one knows a simple doc how to decode MP3 files or how sound files are compress? (mp3 programming for dummies)

My plan was to dedicate a processor to decode an MP3 files without using any DSP just D/A.




Interfacing IDE with Printer Port
 

Re: Decoding MP3 with a controller w/out using any DSP just

Are you aware that there are MCU's with built-in MP3 decoder? For instance, the 89C51SND1C from Atmel (it's a good chip!). No DSP required, just hook it to a standard audio DAC, like the pcm1600 from Texas Instruments.

The Atmel chip has an IDE (hard disk) and MMC interface built in as well!

Just a thought...

Cheers,
FoxyRick
 

Re: Decoding MP3 with a controller w/out using any DSP just

AFAIK an ARM7TDMI core running at about 70-75MHz and using very good quality software can merely decode 128kbps CBR MP3s. So using a CPU to do the decoding might not be the best idea in your case. I would check the many excellent MPEG decoder chips out there (my personal favourite is /VLSI1001/). Or, as FoxyRick said, use a MCU with an integrated decoder.
 

sources decoder MP3 an ARM7TDMI core

2bogdanm: Tell me please URL to an project with the sources of decoder MP3 an ARM7TDMI core.
 

Re: Decoding MP3 with a controller w/out using any DSP just

Well, it seems that I was wrong and I apologize for this. I found somewhere a link to an MPEG decoder that can decode a 48khz/320kbps MP3 file on an ARM7TDMI core running at only 30MHz! Here is the link to the project:

/https://datatype.helixcommunity.org/mp3dec

So it becomes quite feasible to do this with an ARM! I apologize again for my previous erroneous statement.
 

Re: Decoding MP3 with a controller w/out using any DSP just

Here is problems

Link to code: /https://datatype.helixcommunity.org/source/browse/datatype/mp3/codec/fixpt/
Page not found!
 

Re: Decoding MP3 with a controller w/out using any DSP just

Maybe this helps:

/http://forms.helixcommunity.org/helixdnaclient/
 

Re: Decoding MP3 with a controller w/out using any DSP just

bogdanm said:
Maybe this helps:

/http://forms.helixcommunity.org/helixdnaclient/
Click to expand...

Here there are no sources for ARM core (fixed point)
 

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