read f32 files

[gaelle_c]

Hi,

 I created in Matlab a .F32 (float 32) file, which simply encodes the input voltage to be sent to a speaker. This signal is represented in the picture below, time in samples is on the x axis, and voltage values on the y axis.

Using the VI "Read from binary files",  I cannot find back these specific values (I obtain crazy values like 10 to the power -17 or 25 ...). Does anyone know how to achieve reading from a F32 file?

Thanks a lot,

Gaelle

[altenbach]

try little endian. 😉

If this does not work, attach your file and tell us what values you expect. I am not sure about these matlab files. Are they flat binary or do they contain some header?

[crossrulz]

I know Matlab likes to use little endian.  So definately make sure you have that set in your Read Binary File.  Also, make sure you are trying to read SGL (Single Precision Floating Point numbers) since those are 32 bit.  DBL are 64 bit.

[gaelle_c]

.F32 is IEEE single precision, raw (i.e. no header).

I cannot find how to attach my .F32 on the post... do you know how?

Sorry for being a dummy :]

[altenbach]

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gaelle_c wrote:

I cannot find how to attach my .F32 on the post... do you know how?

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Put it inside a zip file. 😄

[crossrulz]

This should be all you need.

[gaelle_c]

Yes I tried that but I keep on having the error "Error Code: Invalid File Type" ... I could send it via email ?

[gaelle_c]

Thx crossrulz, I'll have a look at that !

[gaelle_c]

The little endian does not do the trick unfortunately 😞 (I have pretty much the same block diagram as the one above)

[altenbach]

"Pretty much" or "exactly" the same? For example if you would wire a sgl array instead of a scalar to the type input, it would expect prepended size information and will no longer work