[Octave-bug-tracker] [bug #59149] [octave forge] (signal) Resampling from 22050 to 48000 Hz introduces strange and unexpected artifacts

[anonymous]

Follow-up Comment #40, bug #59149 (project octave):

Added cout statements to upfirdn.cc (modified version attached).

The version with Ofast and without Ofast use different ranges for ix (file
"delta" attached), because it starts with different values of n.

The correct output value for that should be 0.793431 but with the different
range of ix it becomes 0.932585, hence a spike.

It looks like the culprit may be this line (possibly):

       const octave_idx_type n = floor (m/r);


which gives different results for n depending on compiler flags.

How should n be rounded in that line?

(file #49941, file #49942)
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Additional Item Attachment:

File name: delta                          Size:10 KB
    <https://file.savannah.gnu.org/file/delta?file_id=49941>

File name: upfirdn.cc                     Size:4 KB
    <https://file.savannah.gnu.org/file/upfirdn.cc?file_id=49942>



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