What is meant by acustic coupler?

An acoustic coupler is a device used to connect a telephone handset to a computer or other electronic device, enabling data transmission over traditional phone lines. It typically consists of a small chamber where the microphone and speaker of the telephone are aligned with a microphone and speaker in the connected device. This allows audio signals to be effectively transmitted as data without the need for direct electrical connections. Acoustic couplers were commonly used in early computer modems before more advanced technologies emerged.