Ultrasonic is a antonym of infrasonic.
As adjectives the difference between infrasonic and ultrasonic
is that infrasonic is having frequencies below the human audible range while ultrasonic is beyond (higher in frequency than) the range of sound perceptible to the human ear; with a frequency of 20 kilohertz or higher.
infrasonic
English
Adjective
(
en adjective)
(of sound waves, acoustics) Having frequencies below the human audible range
(of a device) Generating or employing such sound waves
Related terms
* infrasonics
* infrasound
Antonyms
* ultrasonic
ultrasonic
Adjective
(
en adjective)
(acoustics) Beyond (higher in frequency than) the range of sound perceptible to the human ear; with a frequency of 20 kilohertz or higher.
Related terms
* ultrasound, ultrasonics
* sonic
Antonyms
* infrasonic