The EXACT-ATSC exciter's core modulation and correction functions are processed by firmware that resides on internal Field Programmable Gate Arrays (FPGA).
This architecture provides flexibility so as digital TV standards evolve and change, the processing can be upgraded and adapted to meet these new requirements, simply by loading new firmware.
Beyond the FPGA technology, the exciter platform incorporates a microcontroller for user interface to the monitor and control functions. Custom software running in the exciter provides user access through various Man-Machine Interfaces (MMI) provided from the EXACTATSC.
The EXACT-ATSC exciter integrates Digital Adaptive Precorrection (DAP) technology, which provides superior performance that is unattainable using any other correction technique.
This technology allows for simple
and easy setup and maintenance of
a high performance transmitter
system.
DAP technology provides
unsurpassed digital correction of all
distortions created by a DTV
transmitter system. These
distortions include nonlinear
distortions created by active
amplifier devices, such as amplitude
and phase distortions along with
correction for memory effect.
Additionally DAP corrects linear
distortions created by the
transmitter’s high-power passive RF
system, such as group delay and
frequency response distortions
maximizing the SNR performance.
The EXACT-ATSC exciter incorporates local control and monitoring using an enhanced user interface front panel with backlit LCD display, LED’s, and menu driven push buttons. Local access includes menus for initial setup, configuration status and control functions The front panel displays the forward & reflected power levels, output RF shoulders as well as the SNR performance.
The EXACT-ATSC exciter can also be remotely controlled using the Web GUI interface with nothing more than a PC running a standard web browser. The Web GUI allows users to retrieve information such as SNR, lower and upper RF shoulder measurements, user configuration, and alarms.
The EXACT-ATSC is fully compliant with the ATSC 1.0 A/53 DTV standard. And because the same hardware platform is used across several digital modulation standards, the EXACT-ATSC can also be field upgraded* with new firmware/software to support ATSC 3.0, preserving your investment.
The EXACT-ATSC features two independent sets of dual (A & B) transport stream (TS) inputs. The dual TS inputs allow signal path diversity (i.e. one ASI TS feed via a fiber link and a second ASI TS feed via a STL microwave). The A & B TS switching can be set for automatic or manual depending on the user’s preference.
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