Retaining the phase for FFT normalizations 'power' and 'psd' is obsolete

[sikersten]

General

• pyfar version: 0.6.4

Description

pyfar.dsp.normalization retaines the phase information for the normalizations 'power' and 'psd', though there are regularly defined as real-valued only.
I think this is a leftover from before the signal.freq_raw property was introduced in 0.4.0 (PR #274), which stores the spectrum without normalization (incl. phase). We should consider removing phase information to have coherent definitions.

What I Did

import pyfar as pf
import numpy as np

signal = pf.signals.noise(44100)
signal.fft_norm = 'psd'
pf.plot.freq_phase(signal)