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17. GLOSSARY
AAC
Advanced Audio Coding (AAC) is a lossy compression
and encoding scheme for digital audio. Audio files that
have been encoded with AAC generally achieves better
sound quality than MP3 at similar bit rates.
Analog Audio
An electrical signal that directly represents sound.
Compare this to digital audio which can be an electrical
signal, but is an indirect representation of sound. See
also “Digital Audio”.
Aspect Ratio
The width of a TV screen relative to its height.
Conventional TVs are 4:3 (in other words, the TV screen
is almost square); widescreen models are 16:9 (the TV
screen is almost twice as wide as its height).
Blockbuster
Blockbuster is online service which you can rent or
purchase movies and TV episodes streamed over the
Internet. Blockbuster is only available in the United States.
Digital Audio
An indirect representation of sound by numbers.
During recording, the sound is measured at discrete
intervals (44,100 times a second for CD audio) by
an analog-to-digital converter, generating a stream of
numbers. On playback, a digital-to-analog converter
generates an analog signal based on these numbers.
See also “Sampling Frequency” and “Analog Audio”.
DNS Server
A server which translates Internet domain names into IP addresses.
Dolby Digital Plus
Dolby Digital Plus is the next generation digital audio
compression technology developed as an extension to
Dolby Digital.
Film Fresh
Film Fresh is online service which you can rent or
purchase movies and TV episodes streamed over the
Internet. Film Fresh is only available in the United States.
Gateway
IP address of the electronic devices (such as router)
which provide Internet access.
HDMI (High-Definition Multimedia Interface)
A digital interface between audio and video source. It
can transmit component video, audio, and control signal
with one cable connection.
Hub
A device used for connecting multiple devices to the
network.
IP Address
A set of numbers which are assigned to devices
participating in a computer network.
LAN (Local Area Network)
A group of computer networks covering a small area
like a company, school or home.
Netflix
Netflix is online movie rental service, offering online
streaming to customers in the United States.
Pandora
®
Pandora is a popular personalized Internet radio
service. You can instantly listen to free personalized
radio stations streamed over the Internet from Pandora.
Pandora is only available in the United States.
PCM (Pulse Code Modulation)
The most common system of encoding digital audio,
found on CD and DAT. Excellent quality, but requires a
lot of data compared to formats such as Dolby Digital
and MPEG audio.
Picasa
Picasa allows you to create your original web-based
albums and organize your digital photographs and
images in chronological order.
Router
A networking device which distinguishes the IP address
assigned to each device and routing and forwarding
information in the computer network.
Sampling Frequency
The rate which sound is measured by a specified
interval to turn into digital audio data. The numbers
of sampling in one second defines as the sampling
frequency. The higher the rate, the better the sound
quality.
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