infrasonic:
this is relating to a frequency below the audibility range of human ear or simply produced by infrasonic waves or vibration.
sonic:
relating to sound, sound waves, or the speed of sound.
ultrasonic:
having a frequency above a human ear's audibility limit of about 20000 hertz- used of waves and vibrations
supersonic:
relating to speeds from 1 to 5 times the speed of sound in air.
