Hardware Reference
In-Depth Information
EXERCISE 3.3
Adjust a Monitor
1.
Locate the buttons on your monitor that control its image.
2.
Experiment with the buttons to see if you can determine what they do. Or, look up the
buttons in the monitor's documentation or on the manufacturer's website.
Sound Systems
A computer's sound subsystem consists of all the components involved in sound input
and output. The brain of this operation is the sound card . On some systems, the sound
card is a separate expansion board; on others, sound-card functionality is built into the
motherboard. The other major components of the sound subsystem are the speakers (for
output) and the microphone (for input). You can also optionally hook up other output and
input sources as needed. For example, you may connect a home stereo system as an input
device to record music from LPs onto audio CDs.
Sound cards and sound support on PCs rely almost exclusively on small
round audio jacks that accommodate 3.5 mm plugs. If you need to connect
something that doesn't have that kind of plug, you'll need to purchase an
adapter.
The Strata objectives' Acronyms list includes MPEG, MP3, and MP4. MPEG
stands for Moving Pictures Experts Group, which is an organization that
governs the standards for some video and audio file formats. MP3 stands
for Moving Picture Experts Group Layer 3, an audio standard. MP3 clips
are usually music files. MP4 stands for Moving Picture Experts Group
Layer 4, a video standard.
Speakers
Speakers enable you to hear the audio output from the PC. Speakers can be either internal
(as in a notebook PC) or external (as on a desktop PC).
Depending on the quality of the sound support in the PC (either built in or an add-on
expansion card), there may be one speaker jack or several. A system that supports surround
sound or other advanced speaker sets may have color-coded jacks, as described in
Table 3.1.
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