it's previewed the release of a player mp3 for the Sprinter?
Tthe power of the z84 enough?

We are thinking about possibility to put MP3 codec in to the PLD.
But we need info about MP3 codac format.


---
PETERS PLUS LTD

It is accessible in internet. It is necessary to look simply.

Most likely not, at least not only using the CPU.

Perhaps some device similar to the MAS-Player parallel port MP3 player for Amiga computers can be adapted to work on the ISA-8, or even the printer port of the Sprinter. The MAS-Player has pretty small demands on processor speed and memory.
The designs and some info on the device can be found on:
http://home.snafu.de/dcr/mpeg_hardware.html

We need not C sources of MP3 players. We need information about format of MP3 file (each of bits) and detail description of packing algorithm for copy it in the internal logic of PLD. All information which we found is not full.

---
PETERS PLUS LTD

S? ma gli mp3 sono in genere a 16 bit!!! come ? possibile sentirli su una macchina a 8 bit?!?
Stefano

Ciao Stefano!
Qui si scrive in Inglese! comunque la prossima
versione di BIOS abilita l' audio a 16bit.
Please write in English! ;)
db/s4e

that about this ? this is a header of ISO doc.

TITLE PAGE PROVIDED BY ISO
CD 11172-3
CODING OF MOVING PICTURES AND ASSOCIATED AUDIO
FOR DIGITAL STORAGE MEDIA AT UP TO ABOUT 1.5 MBIT/s
Part 3 AUDIO
CONTENTS

Uhm, not sure if i'm any help here. Please excuse me if i'm acting like a smart-ass and stating the obvious. :/

The MP3 and MP2 formats are stored frequency-time information. MPEG audio files (that is, MP2 and MP3) lack a header. Instead MP3 files consist of many separate chunks, each with their own headers and data. ID3 track information tags are "invalid" data chunks, that are not decoded as sound.

Some simpler MP3 and MP2 hardware players use a simple CPU or microcontroller to decode the MPEG audio format, and then feed the frequency information to a reverse cosine transform chip. The reverse cosine transform chip then transforms the frequency-time signal into PCM.

MP3 data is MP2 data compressed with the simple Huffman algorithm.

Perhaps one approach would be to implement the reverse cosine transform in PLD (since it is very heavy on the CPU), and decode the file information and huffman compressed data with the processor.

At the www.mp3-tech.org you can see a lot of docs for MP3.


---
PETERS PLUS LTD