Hello all, I'm considering a replacement for an ISD4004 voice audio chip with an MP3 decoder [ extended temp. range if possible ]. Any experience with using these kind of chips and recommendation of which one to use would be appreciated.
Thank You for Your time,
Best regards,
-- M. Veselic Sigma Lab.
It is probably less effort and better future-proofing for you to do the decode in software; a low-end ARM7 can do it without much difficulty. Single-chip MP3 decoders are a dying breed, very unusual sole-source parts.
It's a big leap from ISD to an MP3 decoder, though. Have you considered simply using a PWM output from a micro, and ADPCM?
Yes,
The Keil - ARM MCB2130 Development kit is preloaded with wav file examples.
Basically the Philips LPC2138 Micro is programmed to play wave files - included are software examples as well.
Joe G (Home) wrote: > The Keil - ARM MCB2130 Development kit is preloaded with wav file > examples. >
The Keil VOICE demo is just that, a demo as it only plays files directly from memory after you have BIN2HEX'd them limiting it to a few 10's of seconds at the most. This may be sufficient for some applications.
An alternative is to double-buffer the wave files from an SD/MMC card using only 1K of RAM and feed the DAC at 11.025kHz. This method works very well and no MP3 decoding is necessary. A 256M SD can easily hold a few hours of uncompressed audio.
*Peter*
Check out the AT89C51SND3 Microcontroller with MP3/WMA acceleration. Boots from a NAND flash which is also used to store the Audio. (This will give me a Gold Star in Jim Granville's Heaven)
Key function to get MP3 running on an ARM is the MP3 decoder. MP3 source is not cheap to buy. You also need involve yourself in MP3 licensing. If you want to do it, then you need to have an I2S interface or similar on the ARM. This is present in most AT91SAM7 devices. The AT91RM3400 is a nice MP3 player chip.
66 Mhz zero waitstate operation from the onchip 96 kB SRAM. Boots from an AT45 Dataflash A 64 Mbit dataflash should give you close to 9 minutes of sound. If you need less, then you have pincompatible parts downto 1 Mbit.-- Best Regards, Ulf Samuelsson ulf@a-t-m-e-l.com This message is intended to be my own personal view and it may or may not be shared by my employer Atmel Nordic AB
I heard w hile back that there is some "open source" MP3 source for ARM7. Prefereably fully embedded (ie no OS req'd) Where is this code? I understand there are some IP issues with MPEG...
-Andrew M
I'm using the Helix MP3 decoder
true except of current consumption. while arm7 needs for sure more than
100mA, STA013 eats much less. d.
I don't understand what you mean. For mp3 decoder you can grab source of mpg123 from linux. It's GNU and you can surely compile for ARM target. Another problem is of course lack of libraries, so you'll have to grab from mpg123 just there parts you are interested in. But everything is possible. d.
"David Belohrad" skrev i meddelandet news:e3soof$fi0$ snipped-for-privacy@sunnews.cern.ch...
Why for sure? Core power consumption of the AT91SAM7S is about 30 mA. You have to add pwer consumption for peripherals but you are probably only going to run the SPI, the SSC and some timers.
-- Best Regards, Ulf Samuelsson This is intended to be my personal opinion which may, or may bot be shared by my employer Atmel Nordic AB
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