US 12,253,252 B2
Power filtering device
Jonathan Neil Hart, Salt Lake City, UT (US); Paul Mark Michalczuk, Bainbridge Island, WA (US); and Jesse Alden Smith, Ogden, UT (US)
Assigned to SWARM HOLDINGS LLC., Salt Lake City, UT (US)
Filed by Swarm Holdings LLC., Salt Lake City, UT (US)
Filed on Sep. 23, 2022, as Appl. No. 17/952,089.
Prior Publication US 2024/0102644 A1, Mar. 28, 2024
Int. Cl. H03G 5/00 (2006.01); F21V 23/04 (2006.01); F21V 33/00 (2006.01); H03H 11/04 (2006.01); H04R 1/02 (2006.01)
CPC F21V 33/0056 (2013.01) [F21V 23/04 (2013.01); H03H 11/04 (2013.01); H04R 1/028 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An audio filtering and power extraction apparatus for filtering out audio signal and extracting power from a combined signal and direct-current power line including both DC power and an electrical audio signal, comprising:
a. an input configured to functionally couple to a combined signal and direct-current power line;
b. a filtering extractor system functionally coupled to the input, including:
i. a DC sensing switch circuit; and
ii. a second order low-pass filter functionally coupled to the DC sensing switch circuit, the second order low-pass filter including:
1. An inductor or virtual inductor in combination with
2. a capacitor and resistor in series with each other; and
c. an output functionally coupled to an output of the filtering extractor system and through which output extracted power is provided.