Based on a deep understanding of all-phase digital filter (APDF) design and all-phase biorthogonal transform (APBT). this paper will further study the windowed all-phase digital filter (WAPDF) and windowed all-phase biorthogonal transform (WAPBT). discuss the principle of the WAPBT. and provide a unified construction method of the all-phase transform (APT). https://www.roneverhart.com/HP-Pavilion-15-eg2373cl-15-6-FHD-Touch-Laptop-Intel-Core-i7-1255U-3-50-GHz-GeForce-MX550-16GB-DDR4-512GB-SSD-Windows--p8309/