Converting double values file to 2 byte per sample.
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ratnesh pandey
il 16 Lug 2020
Commentato: Walter Roberson
il 17 Lug 2020
Hi,
I have a .txt file with 128 x 11900 vlaues. These values are doubles ranging from -0.00023462 to +1.0719. I need to convert them to 2 bytes per sample and store in a .bin file. I am not getting how to do it. I tried using the 'fread' function of matlab but all I am able to do is convert each sample to 8 bytes(double precision). Is there a way I can convert each sample into 2 bytes each?
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Walter Roberson
il 16 Lug 2020
two_bytes = uint16(floor(YourMatrix/1.636E-5)+15);
and fwrite() as uint16 .
reconstructed = (double(two_bytes) - 15) * 1.636E-5
the reconstruction error can be up to 1.636E-5 . You can reduce the average reconstruction error by using round() instead of floor(), but then you have to work on the boundary condition (the +15 or -15) (though there happens to be just enough slack room in the representation so that it is not a problem.)
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James Tursa
il 16 Lug 2020
If you want a two byte floating point representation you can use half precision. E.g.,
This is one of the standard floating point formats, but will result in less precision than Walter's method because some of the bits are used for sign and exponent.
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