3

See the title. This would be analogous to "ultraviolet" and "infrared" for color.

  • Ultrasonic. – JLG Dec 9 '15 at 15:07
  • Colloquially, "dog whistle", which also has a specific connotation in describing US politics. – user662852 Dec 9 '15 at 15:31
4

Sonic describes sounds. So you would use Ultra or Infra combined with Sonic.

Ultrasonic(ul-tra-son-ic):

of or involving sound waves with a frequency above the upper limit of human hearing.

Infrasonic (in-fra-son-ic):

relating to or denoting sound waves with a frequency below the lower limit of human audibility.

Both definitions come from the Oxford Dictionary of English.

1

You probably mean ultrasound:

  • (General Physics) ultrasonic waves at frequencies above the audible range (above about 20 kHz), used in cleaning metallic parts, echo sounding, medical diagnosis and therapy, etc.

Collins Dictionary

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