about mp3 decoding

The Sendo X has two ARM processors, an ARM 7 and ARM 9 if I remember correctly.

MP3 decoding is done by the ARM 7 processor, which is the main processor in the phone. The other ARM 9 is responsible solely for drawing to the screen. (unless Kev tells me I'm wrong)

If it is anything like most S60 phones, the ARM7 is the baseband processor handling the cellular modem/software and the ARM9 is the application processor running Symbian/S60.

Kev is going to tell you that you are wrong 😉

There's a processor that handles the phone side, a processor that handles the Symbian OS and then there are the GraphiX and SoniX chips that the Sendo marketing department got all excited about!

As far as I know the Symbian OS processor is an OMAP based TI ARM core, which means that it has a built in TI DSP co-processor. I did make an attempt at making some of the OggPlay code run on the DSP but it appears that Sendo didn't include the DSP dlls in the ROM so I didn't get very far. Since you can't really use the DSP without the necessary dlls I'd guess that the mp3 player does the decoding using the ARM core, just like OggPlay does.

fig7 wrote:Kev is going to tell you that you are wrong 😉