Tutorials and Topics - Peabody Computer Music

Tutorial 26Frequency domain signalprocessing using pfft~out the left outlet of the pfft~ and the part that is higher than the crossover frequency issent out the right. Here is how this subpatcher might be used with pfft~ in a patch:One way of using the xover~ subpatchNote that we can send integers, floats, and any other Max message to and from a subpatchloaded by pfft~ by using the in and out objects. (See Tutorial 21, Using the poly~ object fordetails. Keep in mind, however, that the signal objects in~ and out~ currently do notfunction inside a pfft~.)As we have already learned, the first two outlets of fftin~ put out a stream of real andimaginary numbers for the bin response for each sample of the FFT analysis (similarly,fftout~ expects these numbers). These are not the amplitude and phase of each bin, butshould be thought of instead as pairs of Cartesian coordinates, where x is the real part andy is the imaginary, representing points on a 2-dimensional plane.209