I took an instance of Fabfilter Pro-Q 2 and make a simple highpass and high shelf. The X axis shows which frequency has that amount of phase change. This plot shows the phase change relative to our original signal on the Y axis from -180° to 180°. That is where the Bode Phase Plot comes in. #Waves tune in harrison mixbus how to#So in order to continue we need to have a way to discuss how to communicate the relative phase changes, at various frequencies, compared to a reference signal. The difference is subtle, however it is there. The ‘Flip’ file has 440hz and 460hz playing at the same relative phase, but 480hz has the polarity inverted (basically similar to a 180° phase rotation). The ‘NoFlip’ file has all 3 playing at a given relative phase. In the Comparator above I have 3 sine waves at 440hz, 460hz and 480hz. However, when you have relative phase between varying frequencies, things begin to matter. Go ahead and load up a track in your DAW and flip the polarity on a sound. As these sine waves change phase, they also begin to interact with each other differently, which can have consequences to how we perceive them and their physical characteristics. It also means that certain processes can affect the phase of the signals that make up our sound. So if we can view sounds as a summation of sine waves, then we also have to realize that these sine waves may need to start at different times and start at different positions to achieve certain complex sounds. Not all phase shift is the result of a signal being time shifted, the phase can also be rotated in place. In our image above the red signal is shifted 90° from the blue signal because the red signal starts at 90° on the blue signal. The phase shift amount is communicated in degrees (or radians) relative to the distance traveled to arrive at that phase location in the reference signal. This value is the difference between the position of the 2 sines (of the same frequency). If we have two signals that we’re comparing then we’re communicating the phase shift. When we only have one signal then we’re communicating phase as a position from 0° to some point in the wave.
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