SVP HDT-02, User Manual

Page: 19 / 233

HDT-02_H.264 High Definition Digital Camera Transmitter
MANUAL V9.9 19
General Features
Input video signals such as composite video, 3G – SDI, HD-SDI, SD-SDI or
HDMI are MPEG-4 encoded, together with 4 analogue Audios, 2 stereo
AES/EBU channels, HDMI embedded or 4 digital Audios embedded on the SDI
signal. The video formats can be 1080p, 1080i, 720p, 576i or 480i. This
Transmitter also has a test pattern and a test tone generator available.
This device has a data channel available that allows transmitting user data or
GPS data as well as a Transport Stream ASI input so it can be used as a
repeater.
The encoder uses a H.264/MPEG-4 Part 10 video compression that provides
output bitrates from 1 Mbps to 100 Mbps and a MPEG-1 Layer II Audio
compression which supplies different Audio bit rates (128, 160, 192, 256 or
384 Kbps).
Encoded signals can be encrypted using BISS-1 or BISS-E scrambling system,
and optionally AES 128 and 256. The encrypted signal will only be received
by the receivers that have a valid descrambling key.
It has a display and a keyboard which makes the configuration and monitoring
of every parameter of the equipment possible.
The equipment is fed with DC power supply from 8 to 36V. It can be powered
through DC power supply connector or through the battery mount (optional).
Its excellent design, mechanical and electronic assembly make the HDT-02 a
robust and reliable solution.
DVB-T2 features
It is available from 1 GHz to 6.4 GHz through three different output bands,
being 100 mW the maximum output power. High quality components have
been used to achieve the best output signal quality.
The HDT-02 digital camera Transmitter uses COFDM (Coded Orthogonal
Frequency Division Multiplexing) modulation system (1K, 2K, 4K) which
provides superior signal robustness and a higher link performance. This
technology provides operators with efficient means to overcome the
challenges of NLOS propagation and mobile channels propagation.
COFDM spread spectrum modulation system distributes the data over a large
number of closely-spaced carriers, for example, 1705 carriers in 2K mode.
The data is divided into several parallel data streams, one for each carrier,
so, each carrier transports a lower data rate and the symbol duration is
longer. Each carrier is then modulated with a QPSK, 16QAM, 64QAM or
256QAM scheme. Moreover, the rotated constellation technique is applied in
order to improve the link performance.
A COFDM modulated signal, as it uses a low symbol rate modulation scheme
(
i.e. where the symbols are relatively long compared to the channel time
characteristics), suffers less from intersymbol interference (ISI) caused by
multipath propagation. As the duration of each symbol is long, it is feasible
to insert a guard interval between the COFDM symbols, thus eliminating the
intersymbol and co- channel interference. So, if one carrier’s information is
lost, only a small part of the whole information would be lost.