parabolic reflector; sound collector
A device that collects and focuses sound waves, often using a parabolic dish. Used in nature observation, surveillance, or audio recording.
When you use a parabolic reflector for birdwatching, you can hear even distant chirps clearly.
Compound of 集 (collect) + 音 (sound) + 機 (device). The exact origin is uncertain, but it likely arose as a technical term for sound-collecting equipment.