Search the web
Sign In
New User? Sign Up
pjrcmp3 · PJRC Homebrew MP3 Player Discussion
? Already a member? Sign in to Yahoo!

Yahoo! Groups Tips

Did you know...
Hear how Yahoo! Groups has changed the lives of others. Take me there.

Best of Y! Groups

   Check them out and nominate your group.
Having problems with message search? Fill out this form to ensure your group is one of the first to be migrated to the new message search system.

Messages

  Messages Help
Advanced
MP3 Player limitations   Message List  
Reply | Forward Message #5047 of 5073 |
Re: [pjrcmp3] MP3 Player limitations

I am not sure about the particulars of this design. It may be a limitation of the decoder chip used for this version of the hardware or maybe they 8501 could not set correct parameters for the decoder.

Keith

On Tue, Mar 4, 2008 at 5:14 AM, mc_cuppa_t <mc_cuppa_t@...> wrote:

Hey ppl,

Im currently researching into 8051 based mp3 players and you guys have
overcome the processing power limitiations of the 8051.

Can you tell me what it is in the old mp3 player
(http://www.pjrc.com/tech/mp3/old_player.html)
That prevents it from being able to handle anything greater the 192kbit/s

Is it the speed at which it can access the hard drive?

Also would you know the processor loading for each part of the firmware?

i.e. what % is spent hd access, serial transfer to decoder, idle etc

Many Thanks,
Ryan.




Wed Mar 5, 2008 1:33 am

colonwq
Offline Offline
Send Email Send Email

Forward
Message #5047 of 5073 |
Expand Messages Author Sort by Date

Hey ppl, Im currently researching into 8051 based mp3 players and you guys have overcome the processing power limitiations of the 8051. Can you tell me what it...
mc_cuppa_t
Offline Send Email
Mar 4, 2008
11:14 am

I am not sure about the particulars of this design. It may be a limitation of the decoder chip used for this version of the hardware or maybe they 8501 could...
Keith Schincke
colonwq
Offline Send Email
Mar 5, 2008
1:33 am

... The new design overcomes the limitations of the 8051 by offloading much of the data transfer (drive->ram, ram->mp3 decoder) in the FPGA. So, for the most...
Laine Walker-Avina
nerdguy0
Offline Send Email
Mar 5, 2008
1:45 am
Advanced

Copyright © 2009 Yahoo! Inc. All rights reserved.
Privacy Policy - Terms of Service - Guidelines - Help