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Forum: µC & Digital Electronics Get Binary-Data from Wav-File


von Samuel_Schmid (Guest)


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Hello

I want to play a sound with a microcontroller. I have the whole circuit 
but I hava a problem with the sound data.

I have the sound in a wav-file but I'm not able to get the binary-data 
out of it. Does anybody know how I can get this data out of a wav-file?

Thanks a lot

Samuel_Schmid

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von Martin T. (mthomas) (Moderator)


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I wonder if you even tried to search the net a little bit. You may start 
here: http://en.wikipedia.org/wiki/WAV and follow the links.
Some code for "inspiration" may be found in Atmel's Examples for AT91, 
AVR, AVR32... from atmel.com. IRC I have also seen code to read 
WAV-Files in at least one of the examples. There is also a "WAV to 
ADPCM" converter (for PC, with source-code) in the Atmel 
Application-Notes for AVR. In example-codes from Sharp for ARM-based 
controllers there have also been WAV-decoding functions (search nxp.com, 
they acquired this business-section from Sharp). Check Microchip's 
AppNotes, ST Microelectronics STM32, STR7, STR9 AppNotes...

von Gerhard (Guest)


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you might look at SoX (Sound Exchange Program) at 
http://sox.sourceforge.net/. There is also a Windows executable. You can 
use it to create the pure binary data from a Wav file.

Gerhard

von Mirko H. (m1rk0)


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Or, if you are looking for a programming library, libsndfile can import 
quite a lot of audio formats: http://www.mega-nerd.com/libsndfile/

Mirko

von Drachenbändiger (Guest)


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Your question is not really specific enough to permit a clear answer. 
Let me guess: Is this what you are after? wav2c: 
http://en.pudn.com/downloads105/sourcecode/speech/detail433676_en.html

von Drachenbändiger (Guest)


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Here is another link (no login required) for wav2c :
  http://github.com/olleolleolle/wav2c

von Samuel_Schmid (Guest)


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Thank you very much for your answers.

I think the way2c is the right thing for me. But it seems like I have to 
compile this program first, before I can use it. Does anybody know how I 
have to do that?

Samuel_Schmid

von Drachenbändiger (Guest)


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Here is a precompiled version: http://darkfader.net/ngpc/files/wav2c.zip

von Samuel_Schmid (Guest)


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Thank you very much Drachenbändiger. It works.

I'm going to try the binary data as soon as posiible. I hope it sounds 
well.

Is it right that I have to do the 2-Complement with the generated data 
from the binary file or do I have to do that only in a 16-Bit Wav-File?

Thanks

Samuel_Schmid

von Drachenbändiger (Guest)


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You can feed the data directly into a D/A converter (for 8 bit data, I 
use a simple R2R network). Remove the DC component with a capacitor 
before you amplify the sound.

von ASHISH D. (Company: POLARIS) (ashish_dev)


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Hlo sir
Currently i m working on a project ""converting the sign language into 
speech"" therefore i m facing problem to convert "" .wav files into .hex 
file(byte format)"" to store them into micro controller, thn proceeding 
frm external speaker.
so ny1 plz suggest
thank you.

von Lothar M. (lkmiller) (Moderator)


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ASHISH D. wrote:
> to store them into micro controller
Why not storing them on a µSD/SD card with a FAT file system? Then you 
could very easy change the sound data with a simple copy on any PC...

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