US 11,736,815 B2
Interferer removal for reducing impact of periodic interference signals on analog video transmission
Isaac Molina Hernandez, Valencia (ES); and Sean M. Mullins, Limerick (IE)
Assigned to Analog Devices International Unlimited Company, Limerick (IE)
Filed by Analog Devices International Unlimited Company, Limerick (IE)
Filed on Dec. 15, 2020, as Appl. No. 17/121,821.
Prior Publication US 2022/0191347 A1, Jun. 16, 2022
Int. Cl. H04N 5/21 (2006.01); H04N 23/81 (2023.01); H04N 5/073 (2006.01); H04N 5/213 (2006.01); H04N 7/083 (2006.01)
CPC H04N 23/81 (2023.01) [H04N 5/0736 (2013.01); H04N 5/213 (2013.01); H04N 7/083 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A video receiver for receiving a video signal transmitted in analog format over a video link, the video receiver comprising:
an interferer identification circuit to identify an interference signal from one of vertical blanking intervals (VBIs) of the video signal; and
an interferer removal circuit to generate a filtered video signal, wherein generation of the filtered video signal includes, for each line of a plurality of lines of a frame of the video signal:
generating an adjusted interference signal by adjusting a phase of the interference signal to match a phase of a noise signal in at least a portion of a horizontal blanking interval (HBI) associated with the line, and
subtracting the adjusted interference signal from a plurality of active pixel values of the line.