Self-Adjusting Digital Notch Filter.
DEPARTMENT OF THE AIR FORCE WASHINGTON D C
Pagination or Media Count:
The patent relates to digital filter auto-adjustment to variations in input signals achieved by normalizing the output of the second of two substantially identical series-connected digital filter stages and subtracting the normalized output of the second filter stage from its input to provide a measure of filter signal residue power. Deviations of the signal residue power from the preset limits of a signal residue power standard are detected and signals responsive thereto are used to appropriately adjust variable bandwidth constants in both filter stages.
- Electrical and Electronic Equipment