( ( These ( ( continuously varying ) voltages ) ) ( ( ( make up ) ( an ( analog ( voice ( or ( video signal ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT These) (ADJP (RB continuously) (JJ varying)) (NNS voltages)) (VP (VBP make) (PRT (RP up)) (NP (DT an) (JJ analog) (NN voice) (CC or) (NN video) (NN signal))) (. .)))
These continuously varying voltages make up an analog voice or video signal.
(ROOT (S (NP (NNP Voltage)) (VP (VBZ is) (ADJP (RB continuously) (VBG changing) (PP (IN within) (NP (NP (DT a) (NN circuit)) (PP (IN in) (NP (DT an) (JJ analog) (NN signal))))))) (. .)))