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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 technology.

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) video signals.
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.
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