[Validation] How do you reshape cpp_stft?

[shreks7]

You have this line in the validation notebook -
cpp_stft = cpp_stft.reshape((int(len(cpp_stft)/514), 514))

How do you get the number 514?

Thank you!

[shreks7]

I tried the nearest divisor of len(cpp_stft) however then I get this error -

  File ".\plotTest.py", line 57, in <module>
    validateSTFT(inputAudioFile, inputBinaryFile)
  File ".\plotTest.py", line 41, in validateSTFT
    cpp_stft = cpp_stft[:,0::2] + cpp_stft[:,1::2]*1j
ValueError: operands could not be broadcast together with shapes (290,257) (290,256)```

[kooBH]

wav : [number_of_sample] -> stft[number_of_frame, n_hfft]
n_hfft = (n_fft)/2 +1

when n_fft = 512
n_hfft = 257
since STFT is in complex domian, view as double type array, stft[number_of_frame, 257*2]

and in the memory sequence of data is : real imag real imag
so, to convert into complex type cpp_stft[:,0::2] + cpp_stft[:,1::2]*1j. And it seems one imaginary axis is missing.