multichannel waveform write to binary file

[opiq]

I'm sorry, but i didn't manage to record it into .wav file. i gave up and save it in binary format instead. Maybe others can give you solution

[Pulled_Down]

Hi Opiq! Can you give me the Solution of writing a Multichannel Array into a binary file for .wav?
How did you manage the arrangement of the Samples?

Greets!

[Pulled_Down]

Long long time ago was opiq's last visit....mh 😕
Can anyone else help?

[eltico]

Hi Pulled_Down, I've been reading and I think is possible to save a Multichannel Array into a binary file but the problem is once you try to reproduce it. What are you trying to do?

[Pulled_Down]

Hi Pedro!
Im trying to save a 2D Array as a binary File - continually.
First Things first:
Im reading Data from a SPI Bus - serial and Handle it with an Producer/Consumer queued FIFO. After reading the Data from the FIFO im separating
the Data per Channel and, if necessary, upsample it and convert it from U16 to Int16 - to be .wav conform.
After Doing this, the channels are saved in separate Arrays. At the MOment there are 8 Channels available - Future use is to stock up to 16 Channels.
And here the Problem:
Im trying to save these 8 Channels as Binary Data.
At the Moment im building up an 2D Array from the eight separated Channels.
When the Data is saved, i like to interpret these Data as .wav in Audacity.
Its working but not as it intended.

1. I dont know exactly how to arrange the Data for interpret is as a correct .wav afterwards.
2. How can i manage the Array and Data to save it.

I attached the Consumer Loop where the Data is separated and Saved.
The attached VI is to have a look how the Data looks i want to save.
The Attached Picture from Audacity is how the Problem looks like after load it as raw Data with 3000 Samples per Second and 16 Bit Integer - it seems the Data is saved more than one Time per Channel?!

Any Idea?
I'm grateful for any help!

[RavensFan]

If you open the Graphics and Sound Palette and go down to the Sound File Write.vi,  doesn't that work for you?  It takes an array of waveforms and writes .wav file.

[eltico]

 Hi Pulled

If I am honest I am not sure how the data needs to be sorted to be read by Audacity I've been reading a little bit and I think you can use the function that RavensFan wrote or create the .wav just writting to a text file and sorting the information in the way the format needs. I found here http://www-mmsp.ece.mcgill.ca/documents/audioformats/wave/wave.html and the image and I saw that you're saving the waveforms but I think that .wav asks form more information. 

[Pulled_Down]

Yes, i tried to save the Channel's with the Sound IO but i don't know how to implement this Function exactly 😕
How has the 2D Array to look like to save it correctly or how to implement that VI?
I tried to use the Example "Sound Input to File" but it didn't worked out well.

[GiantDeathRobot]

Hi Pulled_Down,

I used this with your VI to get the array into a waveform the Sound File Write.vi accepted

https://decibel.ni.com/content/docs/DOC-10712

GiantDeathRobot

[Pulled_Down]

Hi GiantDeathRobot!
Thank's for the Link! It's almost working but i have a Problem with my Ressources...streaming Data into the File as a .wav directly uses too much processing power and memory....that's pretty bad 😞
Now i try to stream the Data to Disk as Binary first and correcth then the Header to a correct .wav - the Discussion can be found here:

https://forums.ni.com/t5/LabVIEW/writing-WAV-file-contyinuously-streaming/m-p/3314867#M970927

Thank's so long! Feel free to criticise and participate... 😛