MP3 recorder

[angelodm]

Posted on January 10, 2010 at 06:14

MP3 recorder

[angelodm]

Posted on May 17, 2011 at 13:37

Hi all,

I have to develop a mp3 recorder for my customer: microfone + preamp + MP3 encoder + uSD system. stm32 seems a right choise, but I need the help with mp3 encoder and uSD systems. Are there application notes, links or suggests that I can see? Please help me!!! Thanks Angelo

[kjepsen9]

Posted on May 17, 2011 at 13:37

Hello,

I suggest you find a chip there can do this by it self. The STM32 at 72Mhz can decode 320kbit, but it takes mostly of the resources... Kasper

[angelodm]

Posted on May 17, 2011 at 13:37

Dear Kasper,

thank you very much for your fast answer! two others questions: 1) Please, could you suggest me a mp3 encoder chip? Maybe I can record audio data without compression, please could you confirm the following reasoning: using a 16bit ADC audio encoder with 48KHz sample rate I can store 1 Hour of audio with 345MByte (on SD memory card) right? If yes, can I use STM32 I2S (PCM) port to interface a extern ADC 16bit 48KHz to SD Card port via DMA? I have to be able to transfer 96KByte/s from ADC to SD Card without loss data, can I do this with STM32? (I want use SD such as a low memory without FAT) Thanks Best Regards Angelo

[kjepsen9]

Posted on May 17, 2011 at 13:37

Hello,

You can search the internet for encoder chips, i have not ised one. I get it to be 660Mbyte/hour... I believe you can get the datarate to the SD card as well, use the SDIO port, not the SPI What are you going to record, you need that high quality? Maybe ogg vorbis was an idea or ST speach library... Kasper