Inverse FFT - how to synchronize the phase in each buffer block

[danielrudrich]

You have to rotate the phase of that frequency bin to match the sinusoid’s phase at the end of the buffer.

Phase rotating - math question

Hello, I would like to ask how to perform phase rotating in the wave form. I know that I need to multiply by j - imaginary number to rotate for 90 degree, and j^2 to rotate 180 degree, and j^3 for 270 degree and so on. But it takes me to 3 questions: what should I multiply by to get some between 90 degree angles, for example 45 degree or 60 degree? what exactly should I multiply by j? Each sample of the wave? I am not sure, because each sample of wave is real component but for multiplyi…

The equation for your phase offset after one block (hopsize) should be the following
dPhi = frequency / sampleRate * hopsize * 2*pi