Describing a sound:
* The bird's high-pitched chirp was almost a whistle.
* Her high-pitched voice carried across the crowded room.
* The alarm clock emitted a high-pitched ring, jolting me awake.
Describing a voice:
* The little girl's high-pitched voice was filled with excitement.
* His high-pitched voice was a bit grating on the ears.
* The opera singer's high-pitched notes soared effortlessly.
Describing other things:
* The microphone picked up a high-pitched whine from the engine.
* The high-pitched frequency of the ultrasound machine could not be heard by humans.
* The violin's high-pitched notes created a sense of urgency.