Alternatively referred to as audio in and sound in, the line in or line-in is a port found on computer sound cards that enables a user to connect an external audio device such as a cassette tape player, disc player, audio mixer, additional microphones, etc. to record or otherwise manipulate the incoming audio. In the picture to the right, is an example of the back of the sound card. With this sound card the line-in port is blue and is represented as an arrow pointing into sound waves.
- See the connection dictionary definition for listing of other connections on a computer and a visual example of another sound in port.
- Computer sound card help and support.