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Glossary
Analog audioJPEG
An electrical signal that directly represents sound. Com-A Ţle format used for still images, such as photographs
pare this to digital audio which can be an electrical sig-and illustrations. JPEG Ţles are identiŢed by the Ţle
nal, but is an indirect representation of sound. See also extension �.jpg� or �.JPG�. Most digital cameras use this
�Digital audio�.format.
Aspect ratioMP3
The width of a TV screen relative to its height. Conven-MP3 (MPEG1 audio layer 3) is a compressed audio Ţle
tional TVs are 4:3 (in other words, the screen is almost format. Files are recognized by their Ţle extension
square); widescreen models are 16:9 (the screen is �.mp3� or �.MP3�.
almost twice as wide as it is high).MPEG audio
Digital audioAn audio format used on Video CDs and some DVD
An indirect representation of sound by numbers. During discs. This unit can convert MPEG audio to PCM format
recording, the sound is measured at discrete intervals for wider compatibility with digital recorders and AV
(44,100 times a second for CD audio) by an analog-to-ampliŢers. See also �PCM (Pulse Code Modulation)�.
digital converter, generating a stream of numbers.MPEG video
On playback, a digital-to-analog converter generates an The video format used for Video CDs and DVDs. Video
analog signal based on these numbers. See also �Sam-CD uses the older MPEG-1 standard, while DVD uses
pling frequency� and �Analog audio�.the newer and much better quality MPEG-2 standard.
Dolby DigitalPBC (PlayBack Control) (Video CD only)
Using a maximum of 5.1 channels of audio, A system of navigating a Video CD through on-screen
this high quality surround system is used in many of the menus recorded onto the disc. Especially good for discs
Å¢ner movie theaters around the world.that you would normally not watch from beginning to
The on-screen display shows which channels are active, end all at once�karaoke discs, for example.
for example showing 3/2.1. The 3 being the two front PCM (Pulse Code Modulation)
channels and the center channel; the 2 being the surround The most common system of encoding digital audio,
channels, and the .1 being the LFE channel.found on CDs and DAT. Excellent quality, but requires a
DRMlot of data compared to formats such as Dolby Digital
DRM (digital rights management) is a type of server and MPEG audio. For compatibility with digital audio
software developed to enable secure distribution of paid recorders (CD, MD and DAT) and AV ampliŢers with
content over the web, recently incorporated by WMA digital inputs, this unit can convert Dolby Digital, DTS
(Windows Media Audio ).and MPEG audio to PCM. See also �Digital audio�.
DTSRegions (DVD-Video only)
DTS stands for Digital Theater Systems. DTS is These associate discs and players with particular areas of
a surround system different from Dolby Digital that has the world. This unit will only play discs that have com-
become a popular surround sound format for movies.patible region codes. You can Ţnd the region code of
Dynamic rangeyour unit by looking on the rear panel. Some discs are
The difference between the quietest and loudest sounds compatible with more than one region (or all regions).
possible in an audio signal (without distorting or getting Sampling frequency
lost in noise).The rate at which sound is measured to be turned into
Dolby Digital and DTS soundtracks are capable of a very digital audio data. The higher the rate, the better the
wide dynamic range, delivering dramatic cinema-like sound quality, but the more digital information is gener-
effects.ated. Standard CD audio has a sampling frequency of
EXIF (Exchangeable Image File)44.1kHz, which means 44,100 samples (measurements)
A Ţle format developed by Fuji Photo Film for digital per second. See also �Digital audio�.
still cameras. Digital cameras from various manuafctur-WMA
ers use this compressed Ţle format which carries date, WMA is short for Windows Media Audio and refers to
time and thumbnail information, as well as the picture an audio compression technology developed by
data.Microsoft Corporation. WMA data can be encoded by
File extensionusing Windows Media Player version 8 or Windows
A tag added to the end of a Ţlename to indicate the type Media Player for Windows XP.
of Ţle. For example, �.mp3� indicates an MP3 Ţle.
ISO 9660 format
International standard for the volume and Ţle structure
of CD-ROM discs.
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ACEC
