Grass Valley 8980TLS - Manual (Page 7)

8980TLS Instruction Manual 1
8980TLS NTSC to HDTV
Tri-level Sync Converter
Introduction
The 8900 Series product line is a family of serial digital distribution ampli-
fiers (DAs) and signal processors. It consists of modules that reside in a 2
rack unit frame holding up to ten modules. A variety of modules are avail-
able that can provide fanout, timing/reclocking, monitoring, or error
detection and handling capabilities. Modules are selected by the user to
suit their particular requirements.
The 8980TLS module is a tri-level sync converter that accepts an NTSC
color black reference input and outputs four duplicate tri-level video sync
signals.
Performance
Tri-level sync is the required reference signal for many HDTV devices such
as VTRs and master control or production switchers. It provides the ability
to extract a high precision low jitter horizontal timing reference for HDTV
equipment. The 8980TLS module provides a very stable tri-level sync
output locked to an NTSC input by using the NTSC color burst as its timing
reference. This provides immunity from any NTSC sync timing jitter that
may be present. A differential input is provided for the reference signal to
provide immunity from any common mode hum or noise that may be
present. An NTSC reference signal with color burst is required for proper
operation.