ClearOne Digital Media - Manual (Page 79)

Signal types and video
formats
Component video
The electrical elements that comprise a video
signal, consisting of luminance and two separate
chrominance signals. These are expressed as
either Y R-Y B-Y or Y Pb Pr. Component video is
the highest quality analog format for HD video up
to 1080i.
DisplayPort
A digital display interface proposed by the Video
Electronics Standards Association (VESA) that
defines a new license-free, royalty-free, digital
audio and video interconnect method intended to
be used primarily between a computer and display
monitor or computer and home theater system. A
newer version known as DisplayPort Multimode
may be converted to HDMI, DVI or RGBHV.
Today nearly all DisplayPort sources implement
DisplayPort Multimode.
DVI
Digital Visual Interface; a digital interface
specification created by an industry consortium,
the Digital Display Working Group. This universal
standard for connecting flat panel monitors is
also used for data projectors, plasma displays,
and digital TVs. Using a DVI connector and
port, a digital signal sent to an analog device is
converted into an analog signal (if the device is
digital, such as a flat panel monitor, no conversion
is necessary). There are three different DVI
configurations: DVI-A for analog signals, DVI-D
for digital signals, and DVI-I (integrated) for both
analog and digital signals.
DTV
Digital television is a generic term that refers to all
digital television formats, including high definition
television (HDTV) and standard definition television
(SDTV).
HDMI
High Definition Multimedia Interface. USB-like
digital video connectivity standard designed as a
successor to DVI. Transmits both digital audio and
video signals and incorporates HDCP digital copy
protection.
SDTV
Standard definition television. Digital television
format that includes 480-line resolution in both
interlaced (480i) and progres- sively scanned
(480p) formats; offers discernible improvement
over conventional analog NTSC picture resolution,
with less noise; similar to DVD or satellite TV quality
but not considered high definition.
Widescreen
An image with an aspect ratio greater than 1.33:1,
or a picture wider and narrower than a traditional
television image. Typi- cally refers to TVs in the 16:9
aspect ratio.
Y Pb Pr (Component Video)
Y Pb Pr (also known as component video) is
specified as luminance, and two chrominance
channels of blue minus luminance and red minus
luminance. This can also be written as Y Cb Cr (or
Y R-Y B-Y).
DRM and Security
Authentication
Authentication ensures digital data transmissions
are delivered to the intended receiver, and also
guarantees integrity of the data and its source.
The simplest form of authentication requires a
username and a password but authentication
protocols may also be based on secret key
encryption, such as DES, or on public key systems
using digital signatures. Modern DRM (digital rights
management) systems all use more advanced key
encryption schemes.
DRM
Digital Rights Management is any secure
technology which enables the copyright owner to
control access to their intellectual property (such
as a music, video, or text file) and to specify what
a user may do with it. For example, DRM can both
encrypt a file so it cannot be easily played outside
the intended playback environment, and DRM
can control access such as with a 48 hour rental
window.
HDCP specific terms:
Authorized Device
An HDCP Device that is permitted access to HDCP
Content is referred to as an Authorized Device.
An HDCP Transmitter may test if a connected
HDCP Receiver is an Authorized Device by
successfully completing the following stages of
the authentication protocol – Authentication and
Key Exchange (AKE) and Locality check. If the
authentication protocol successfully results in
establishing authentication, then the other device
is considered by the HDCP Transmitter to be an
Authorized Device.
Content Stream
Content Stream consists of Audiovisual Content
received from an Upstream Content Control
Function that is to be encrypted and Audiovisual
Content received from an Upstream Content
Control Function that is encrypted by the HDCP
System.
Device Key Set
An HDCP Receiver has a Device Key Set, which
consists of its corresponding Device Secret Keys
along with the associated Public Key Certificate.
pg 79 StreamNet Digital Media and System Design Reference Guide
Glossary