Application Notes / Digital Video Distribution with SparkWave Radio
Digital contribution, distribution and broadcasting of TV audio and video
signals offer a high quality of transmitted picture and voice as well as enabling the introduction
of new services such as video-on-demand (VOD).
The source of video signals and the terminal devices (televisions) have been
(up to now) mostly analogue (for example the PAL, SECAM or NTSC
standards). In the first phase, digital contribution (interconnection of
TV program production centers) and distribution (connection of program
production centers to the broadcasting transmitter or cable operators)
can be considered. In order to minimize the cost of investment, the
maximum implementation of the existing public telecommunication network
(SDH) can be considered. For the connection of TV production centers to
the public communication network and for the "last mile" access to the
broadcasting transmitter or cable operator SparkWave radio can be used.
One of the possible solutions of digital TV distribution is presented
in this article. The solution includes SparkWave radios and digital video
equipment of our partner Scientific Atlanta, leading partner inglobal interactive
A digital video distribution system is divided between the Program Production
Center (PPC), Transport Network (Public Telecom Network) and Radio or
cable-broadcasting center. These three parts of the system are connected
by Iskra Transmission SparkWave radio.
For video processing of TV signal the solution of our partner Scientific Atlanta
called the GALAXY Modular Rack Concept is selected. The applied components of
this system are:
The POLARIS MPEG-2 Video Encoder is intended for the encoding of up to three video
programs with associated audio and data channels.
The input channels can be uncompressed SDI and/or composite (PAL / PALplus / NTSC)
The output of POLARIS is a packet switched ASI compliant digital stream with
a maximum bit rate 213.9 Mbit/s.
NEON is a bridge between MPEG and digital networks. NEON is available in
two versions, a transmitter (Tx) and a receiver (Rx). The NEON Tx accepts
an ASI compliant Transport Stream and provides signals ready to interface
with PDH/SDH network equipment. NEON Rx does exactly the opposite. The Network
Adapters are fully compliant with the ITU-T telecommunication standards.
PEGASUS is used as a transport stream re-multiplexer. It can hold up to
3 single and/or double MPTS input cards, giving up to 6 MPTS inputs. Each
unit has two (identical) ASI TS outputs, making it possible to source signals
to different devices.
The MIRA is a professional MPEG-2 decoder that can be used in a wide
range of applications. Some of the most important applications are feeding
analogue TV transmitters or analogue cable networks.
The PYXIS MKII MPEG-2 Encoder is a versatile single channel encoder, which
is suited for several applications. PAL, PALplus, NTSC and/or SDI input
interfaces are available. The audio can be transmitted compressed according
to MPEG-1 Layer II, or uncompressed as linear audio (SMPTE 302M). Video,
audio and auxiliary data are multiplexed into a dual DVB compliant transport
stream output or optional telecom interfaces.