How to log 8 DAQmx channels into a single wav file?

[Coq_Rouge]

please zip and post your clients wav file 😉

Message Edited by Coq Rouge on 03-23-2010 03:57 PM

[Coq_Rouge]

sorry did not see the note about the file.

PS it is better to use zip files than such renaming, and zip files is smaller

[Vincent_Carpentier]

Thanks for the idea about the zip file....I should have thought of that 🙂

Here is the wav file in attachment... 

[Coq_Rouge]

HI

Vincent Carpen…

I have bad news for your client. The software he/she is used is based on 16 bit numbers, and can not handle anything else than that. The data is normalized so 2^15 equals 1000mV. If you read files that is not based on a I16 data type, the same will apply, the numbers will be converted to a I16 data type. If the number is outside the I16 range it will be truncated, no matter which data type is used. And that is causing all the problems with 24 bit wav file I guess. The software is poor designed regarding this matter.

Se my example.

Here is the .ua file type def, as it big endian based it is simpler to use in Labview http://en.wikipedia.org/wiki/Au_file_format

[Vincent_Carpentier]

Awesome Coq Rouge!  Great idea going with the UA file format instead of dealing with the wav.

It works well with your demo vi.

Thank you very much!

Vincent 

[Coq_Rouge]

Most audio players accept the .UA (also named .SND) file format. And the same goes for matlab. I will never use the pesky wav format again. The UA file format is very Labview friendly due to the use of Big Endian format. It is so simple that is could be done as a lesson very early in a Labview basic course.