high frequencies

• ultrasonicAbove audible frequency range
• trebleHigh frequency range
• pitchFrequency of sound
• shrillHigh-pitched and harsh
• piercingPenetrating or very sharp

squeaky · whistle · ringing · tinnitus · soprano · falsetto · vibration · oscillation · hertz · kilohertz · radio · wavelength · spectrum · sine · frequency · resonance · overtones · harmonics