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In order to be able to listen to your music, a sound card converts digital data to analog sound waves you can hear. The output signal is then connected to a headphone or set of speakers. You can also use a sound card to record audio with a microphone.

Sound card connections

The picture is an example of a sound card audio ports or audio jacks on the back of your computer, associated colors, and the connector symbols.

• Digital Out (white or yellow; words: "Digital" or "Digital Out") - Used with surround sound or loudspeakers.
• Sound in or line in (blue; Arrow pointing into waves) - Connection for external audio sources, (e.g., tape recorder, record player, or CD player.)
• Microphone or Mic (pink) - The connection for a microphone or headphones.
• Sound out or line out (green; Arrow pointing out of waves) - The primary sound connection for your speakers or headphones. This sound card also has a second (black) and third (orange) sound out connector.
• FireWire (not pictured) - Used with some high-quality sound cards for digital video cameras and other devices.
• MIDI or joystick (15 pin yellow connector) - Used with earlier sound cards to connect MIDI keyboard or joystick.

Uses of a computer sound card

Below are all of the different areas of a computer a sound card can be used.

• Games.
• Audio CDs and listening to music.
• Watch movies.
• Audio and video conferencing.
• Creating and playing MIDI.
• Educational software.
• Business presentations.
• Record dictations.
• Voice recognition.

History of the sound card

The first sound card is considered to be the Gooch Synthetic Woodwind, used by PLATO terminals. It was invented by Sherwin Gooch in 1972, and was a synthesizer capable of 4-voice music synthesis.

The Apple II computer was capable of using plug-in sound cards. The Apple Music Synthesizer was the first plug-in sound card used by the Apple II, developed by ALF Products Inc. in 1978.

AdLib was one of the first companies to manufacture sound cards for the IBM PC. AdLib developed the Music Synthesizer Card in 1987, basing it on the Yamaha YM3812 sound chip.