octave-signal 1.4.1-4build1 (riscv64 binary) in ubuntu hirsute

 This package provides signal processing tools including filtering,
 windowing and display functions in octave.
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 Blackman-Harris, Blackman-Nuttall and Bohman are among the windowing functions
 and filters include Chebyshev type filters and butterworth filters.
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 Additionally, some wavelet functions are included.
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 This Octave add-on package is part of the Octave-Forge project.