AGL7 module theory of operation
AGL7 module th
eory of operation
This section
describes the basic operation of the major circuit blocks in the AGL7
Analog Genlock module.
Analog genlock
The analog genlock consists of the following blocks.
Bus interface
This block provides the communication between the mainframe and the module
circuit.
Amp and restorer
This block consists of amplifiers to adjust the amplitude of the signal from REF or
CW input and restorer to recover the DC component of the signal.
Sync separato r
The sync separator separates the sync signals such as H sync, V sync, or composite
sync from the conditioned REF signal if the signal contains the sync.
A/D converte r
The A/D converter digitizes the analog input signal to 10 bits digital data for
genlock operation. This data is read by the CPU in the mainframe and used to
control the master oscillator frequency.
Genlock controller
This block controls the A/D converter, memory, and sync separator to obtain
correct digital data.
Black burst generator
The black burst generator consists of the following blocks:
Black burst gen erator
This block generates NTSC or PAL black burst digital data.
Trilevel sync generator
This block generates trilevel sync digital data.
D/A con verter and amp
This block consists of a D/A converter, two amplifiers, and a filter. It converts the
digital data from the black burst generator or trilevel sync generator to an analog
signal and reconstructs the signal for output. The "D/A Converter & Amp 3" also
has a wide bandwidth filter for the HDTV trilevel sync signal.
4–12 TG8000 Multiformat Test Signal Generator Service Manual
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