He acquired some military-grade loudspeakers that made a high-pitched noise, which would be switched on just as the parties were winding down.

And over the past few days the equipment has turned hot and begun emitting an irritating high-pitched noise.

For several weeks, on the increasingly rare occasions when anyone made a high-pitched noise in our bedroom, the reward was a loud beeping noise.

When he tries to speak to them, he can only emit a high-pitched noise.

The device emitted a high-pitched noise every few minutes.