rfft vs fft

[mohjaba]

Hi, in the file "sigproc.py" in line 102 & 103:

complex_spec = numpy.fft.rfft(frames, NFFT)
return numpy.absolute(complex_spec)

"rfft" return real not complex, you can use "fft" instead or keep it and no need for "numpy.absolute"

[jameslyons]

Rfft is applied to real sequences, it does not return real sequences. Applied to speech signals it returns a complex spectrum, so we still need to take the absolute. Documentation here: https://docs.scipy.org/doc/numpy/reference/generated/numpy.fft.rfft.html

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On Sat, 2 Jun 2018, 2:39 PM Jalal Abdulbaqi ***@***.***> wrote: Hi, in the file "sigproc.py" in line 102 & 103: complex_spec = numpy.fft.rfft(frames, NFFT) return numpy.absolute(complex_spec) "rfft" return real not complex, you can use "fft" instead or keep it and no need for "numpy.absolute" — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#65>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ABn1QRhjtlLIhMN86gTZYjs7qjw8in33ks5t4hbygaJpZM4UXixy> .