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Re: slightly OT: raw audio file format


You can use my Daqarta for Windows software for this.  
Daqarta uses the extension ".DAT" to refer to any audio 
file with no header, or with an unknown header.  You can 
either rename your file to have a .DAT extension , or enter 
the name manually.

Download and start Daqarta.  (No purchase required for this 
purpose.)  Click on the "DD/Open" button in the main 
toolbar.  This will start a standard Windows "Open" dialog. 
 If your file has been renamed to .DAT, select it... 
otherwise enter the full name.  

When Daqarta tries to open the file and can't find a header 
it understands, it pops up a .DAT dialog that allows you to 
enter the properties of the file that you know or suspect.  
Daqarta currently supports 8, 12, or 16 bits, signed or 
unsigned, mono, stereo, or 4-channel, arbitrary sample 
rate, and decimation factor.  You can also enter an 
arbitrary number of header bytes to be skipped.

(Right-click on any control in Daqarta to see the Help 
topic for it.)  

The file will then be opened with these parameters.  If it 
looks totally like trash, close it and try again.  You may 
get something that looks reasonable, but with a burst of 
trash at the start... that may be an unknown header, which 
you can skip.

When you have what you think is correct, you can either 
analyze it with Daqarta, or save it as a standard .WAV file 
for your software of choice.

Best regards,

Bob Masta

On 1 Jun 2011 at 12:00, Massimo Grassi wrote:

> Dear list members,
> I've been asked by a friend to work on a recording. The recording file 
> extension is "raw". I'm not familiar with this type of file. As far as I 
> understood this file-type is an uncompressed audio file with no header 
> information.
> Here come the questions:
> 1. Are the above information correct?
> 2. Is there any other info missing?
> 3. How do I understand sample rate and bit resolution if the file has no 
> header?
> Thank you all in advance,
> m

Bob Masta
            D A Q A R T A
Data AcQuisition And Real-Time Analysis
Scope, Spectrum, Spectrogram, Signal Generator
    Science with your sound card!