X1200 Series Router Manual
OVERVIEW
Revision 1.3.2
Page 1-7
defines the sampling systems, matrix values and filter characteristics for both Y, B-Y, R-Y and
RGB component digital television signals.
SERIAL DIGITAL Digital information that is transmitted in serial form. Often used informally to refer to
serial digital television signals.
4Fsc: Four times subcarrier sampling rate uses in composite digital systems. In NTSC this is 14.3 MHz.
In PAL this is 17.7 MHz.
4:2:2 A commonly used term for a component digital video format. The details of the format are
specified in the CCIR-601 standard. The numerals 4:2:2 denote the ratio of the sampling
frequencies of the luminance channel to the two colour difference channels. For every four
luminance samples, there are two samples of each colour difference channel.
SDI An abbreviation for serial digital interface, this acronym is most commonly used to refer to
Standard definition serial digital television video signals up to 540 Mb/s.
HDTV An abbreviation for high definition television, this acronym is most commonly used to refer to High
definition serial digital television video signals at 1.485 Gb/s.
AES: (Audio Engineering Society): A professional organisation that recommends standards for the
audio industries.
AES/EBU: Informal name for a digital audio standard established jointly by the Audio Engineering
Society and the European Broadcasting Union organisations.
ANALOG: An adjective describing any signal that varies continuously as opposed to a digital signal
that contains discrete levels representing digits 0 and 1.
A-TO-D CONVERTER (ANALOG-TO-DIGITAL): A circuit that uses digital sampling to convert an
analog signal into a digital representation of that signal.
BIT: A binary representation of 0 or 1. One of the quantized levels of a pixel.
BIT PARALLEL: Byte-wise transmission of digital video down a multi-conductor cable where each
pair of wires carries a single bit. This standard is covered under SMPTE 125M, EBU 3267-E
and CCIR 656.
BIT SERIAL: Bit-wise transmission of digital video down a single conductor such as coaxial cable. May
also be sent through fiber optics. This standard is covered under SMPTE 259M and CCIR 656.
BIT STREAM:A continuous series of bits transmitted on a line.
BYTE: A complete set of quantized levels containing all the bits. Bytes consisting of 8 to 10 bits per
sample are typical in digital video systems.
CABLE EQUALIZATION: The process of altering the frequency response of a video amplifier to
compensate for high frequency losses in coaxial cable.
CCIR (International Radio Consultative Committee): An international standards committee. (This
organisation is now known as ITU.)
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