hi fidelity audio recorder possible with arduino?

hi fidelity audio recorder possible with arduino?#132222

By neededandwanted - Mon Aug 22, 2011 11:37 am

- Mon Aug 22, 2011 11:37 am #132222

microphone -> preamp -> arduino mega -> SD card (shield)

Has anyone done this with decent fidelity?

What sort of bandwidth might be possible for the recording? Would it me impractical for me to try and get a single channel of CD-quality (or better) audio captured and stored on the SD card as .wav files?

Re: hi fidelity audio recorder possible with arduino?#132223

By fll-freak - Mon Aug 22, 2011 11:48 am

- Mon Aug 22, 2011 11:48 am #132223

Experimentation leads me to believe that you can sample one channel at about 6KHz if you simply discard the sample you collect. Doing something with the sample slows down the sample rate. Since 6KHz is much less than the 44KHz of CD audio I think the answer is a NO. Sorry.

-Skye Sweeney

http://www.fll-freak.com/blog

external AD conversion could help?#132226

By neededandwanted - Mon Aug 22, 2011 12:15 pm

- Mon Aug 22, 2011 12:15 pm #132226

What if I did the analog to digital conversion outside of the mega? Could I just deliver the digital stream to it and have it do file handling or something?

Or, how might I go about making a digital recorder here?

Re: hi fidelity audio recorder possible with arduino?#132233

By KeithB - Mon Aug 22, 2011 1:14 pm

- Mon Aug 22, 2011 1:14 pm #132233

What is special about your project that requires something other than a digital cam-corder or a zoom? (Or a MD recorder, if those still exist.)

We need to know the environment: Inside? Outside? Battery powered? water-proof?

We need more details: How long do you need to record? Do you need it to make multiple recordings?

Re: hi fidelity audio recorder possible with arduino?#132235

By fll-freak - Mon Aug 22, 2011 1:30 pm

- Mon Aug 22, 2011 1:30 pm #132235

http://www.sparkfun.com/products/9365
http://www.sparkfun.com/products/8849

-Skye Sweeney

http://www.fll-freak.com/blog

Re: hi fidelity audio recorder possible with arduino?#132236

By neededandwanted - Mon Aug 22, 2011 2:25 pm

- Mon Aug 22, 2011 2:25 pm #132236

Yeah, that http://www.sparkfun.com/products/9365 breakout board is exactly the sort of external A to D converter I was referring to.

So, mic -> preamp -> A to D -> ATmega (via I2s?) -> SD card shield -- ?

The other link was to a playback only device. I don't even want playback, just recording capability.

Re: hi fidelity audio recorder possible with arduino?#132237

By neededandwanted - Mon Aug 22, 2011 2:34 pm

- Mon Aug 22, 2011 2:34 pm #132237

KeithB wrote:What is special about your project that requires something other than a digital cam-corder or a zoom? (Or a MD recorder, if those still exist.)

We need to know the environment: Inside? Outside? Battery powered? water-proof?

We need more details: How long do you need to record? Do you need it to make multiple recordings?

Of course I could use an entirely different device like a camcorder. Or a very similar device like a Zoom H4n or something. Yes, battery powered, but I don't see a lot of mains AC projects here, so assume battery powered use. Indoors, Outdoors, Water-Proof --- not sure if my component selection will really need to factor those in. I am not looking for someone to design an enclosure for me or anything here.

Multiple recordings, yes. Not at the same time. I plan on coding all of the file handling for the SD card though. I want the recording time to be limited only by the capacity of the SD card.

Re: hi fidelity audio recorder possible with arduino?#184557

By whizzer - Fri Sep 04, 2015 3:47 pm

- Fri Sep 04, 2015 3:47 pm #184557

Hey! Did you ever solve this issue?
I have a similar project in mind. Unfortunately the Spark A/D breakout is no longer available.
Do you know of anything similar.
Thanks so very much ahead of time for any help/ideas that you can send along.

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