( ( As ( stated above ) ) ( , ( ( the ( human ear ) ) ( ( can ( ( hear ( sound waves ) ) ( in ( ( the ( 20-20 ( ,000 ( Hz ( ( range and ) ultrasound ) ) ) ) ) ( refers ( to ( sound ( waves ( that ( are ( above ( 20,000 Hz ) ) ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN As) (S (VP (VBN stated) (PP (IN above))))) (, ,) (NP (DT the) (JJ human) (NN ear)) (VP (MD can) (VP (VB hear) (NP (JJ sound) (NNS waves)) (SBAR (IN in) (S (NP (DT the) (CD 20-20) (CD ,000) (NN Hz) (NN range) (CC and) (NN ultrasound)) (VP (VBZ refers) (S (VP (TO to) (VP (VB sound) (NP (NP (NNS waves)) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (PP (IN above) (NP (CD 20,000) (NNS Hz))))))))))))))) (. .)))
As stated above, the human ear can hear sound waves in the 20-20,000 Hz range and ultrasound refers to sound waves that are above 20,000 Hz.
(ROOT (S (NP (PRP You)) (VP (VBP call) (NP (NP (NN sound)) (SBAR (WHNP (WDT that)) (S (VP (VBZ has) (S (NP (DT a) (NN wave) (NN frequency)) (ADJP (JJR higher) (SBAR (IN than) (S (NP (DT the) (JJ human) (NN ear)) (VP (MD can) (VP (VB detect) (NP (NN ultrasound))))))))))))) (. .)))