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File extension
A tag added to the end of a filename to indi-
cate the type of file. For example, “.mp3” indi-
cates an MP3 file.
Interlaced video
A method of displaying a picture in which
odd-numbered lines are updated in one pass,
then even-numbered lines are updated in the
next. See also
Progressive scan video
.
ISO 9660 format
International standard for the volume and file
structure of CD-ROM discs.
JPEG
A file format used for still images, such as
photographs and illustrations. JPEG files are
identified by the file extension “.jpg” or “.JPG”.
Most digital cameras use this format.
MP3
MP3 (MPEG1 audio layer 3) is a compressed
audio file format. Files are recognized by their
file extension “.mp3” or “.MP3”.
MPEG audio
An audio format used on Video CDs and some
DVD discs. This system can convert MPEG
audio to PCM format for wider compatibility
with digital recorders and AV amplifiers. See
also
PCM (Pulse Code Modulation)
.
MPEG video
The video format used for Video CDs and
DVDs. Video CD uses the older MPEG-1 stan-
dard, while DVD uses the newer and much
better quality MPEG-2 standard.
PBC (PlayBack Control) (Video CD/Super
VCD only)
A system of navigating a Video CD/Super VCD
through on-screen menus recorded onto the
disc. Especially good for discs that you would
normally not watch from beginning to end all
at once—karaoke discs, for example.
PCM (Pulse Code Modulation)
The most common system of encoding digital
audio, found on CDs and DAT. Excellent
quality, but requires a lot of data compared to
formats such as Dolby Digital and MPEG
audio. See also
Digital audio
.
Progressive scan video
Also called non-interlaced video, this method
of displaying a picture updates all the lines in
one pass, resulting in a more stable, flicker-
free image than interlaced video (for a given
scanning rate). See also
Interlaced video
.
Regions (DVD-Video only)
These associate discs and players with partic-
ular areas of the world. This system will only
play discs that have compatible region codes.
You can find the region code of your system
by looking on the rear panel. Some discs are
compatible with more than one region (or all
regions).
Sampling frequency
The rate at which sound is measured to be
turned into digital audio data. The higher the
rate, the better the sound quality, but the
more digital information is generated. Stan-
dard CD audio has a sampling frequency of
44.1kHz, which means 44,100 samples
(measurements) per second. See also
Digital
audio
.
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