I tried to understand what "Frequency range vi" consists. But I didn't understand.
From Reference Article(doi:10.15199/48.2021.11.10): No.1 shows the block diagrams of fixed-point data consisting of the start frequency, the end frequency, and the step frequency to set the frequency range and the number of working loops. The number of frequencies in the range and working loops were determined by subtracting the end frequency from the start frequency, then dividing the difference by the step frequency. All the frequencies were defined and kept in an array.