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Chapter 10—Video and Audio
this connector, you can still play CD audio through the computer
speakers by connecting the CD-ROM drive’s headphone
jack to the audio adapter’s line in jack with an
external cable.
The line in, line out, and speaker connectors on an audio
adapter all use the same 1/8-inch mini-jack socket. The three
jacks are usually labeled, but when setting up a computer on or
under a desk, these labels on the back of the PC can be difficult
to read. One of the most common reasons a PC fails to produce
any sound is that the speakers are plugged into the wrong
socket.
If your sound card, microphone, and speakers aren’t color-coded,
do it yourself. See Chapter 1, “General Technical Reference,” for the
PC99 standards for color-coding for audio and other ports.
Connectors for Advanced Features
Many of the newest sound cards are designed for advanced gaming,
DVD audio playback, and sound production uses, and have additional
connectors:
• MIDI In/MIDI Out—Some advanced sound cards don’t
require you to convert the game port (joystick port) to MIDI
interfacing by offering these ports on a separate external
connector. This permits you to use a joystick and have an
external MIDI device connected at the same time. Its typical
location is in an external device.
• SPDIF (also called SP/DIF) In and SPDIF Out—The
Sony/Philips Digital Interface Format connector receives digital
audio signals directly from compatible devices without
converting them to analog format first. Its typical location is
in an external device. SPDIF interfaces are also referred to by
some vendors as Dolby Digital interfaces.
• CD SPDIF—Connects compatible CD-ROM drives with
SPDIF interfacing to the digital input of the sound card. Its
typical location is on the side of the audio card.
• TAD In—Connects modems with Telephone Answering
Device support to the sound card for sound processing of
voice messages. Its typical location is on the side of the
audio card.