Voice-Output Devices

This device produces a human speech like sound, but actually is prerecorded vocalized sounds. Voice output is used in the telephone information system, where the requested number is reported using a voice output system.
For example, when a student enrolls courses using a telephone registration system, he or she hears voice output upon your request. Voice output is becoming common in voice messaging systems.

Modem

Another form of the output device is a modem. A modem is short for "MOdulator-DEModulator." Modulation is the process of converting from digital to analog. Demodulation is the process of converting from analog to digital.
The modem enables digital microcomputers to send output through analog telephone lines. Both voice and data can be carried over through the modem. The modem is not only an output device but also an input device that receives data and voice through a communication channel.