TV Logic and local distributor Techtel announce the implementation of the Free TV Australia Operational Practice OP-47, available on TV Logic’s LVM-173 and LVM-243 broadcast monitors. Compatibility with OP-47 allows for the decoding of closed captions on High Definition video signals.

Free TV Operational Practice OP-47 defines the technical/operational practices associated with the storage and distribution of Closed Caption/Subtitling data in the vertical ancillary space of the 10 bit serial HD-SDI signal complying with ITU-R BT.1120-7.

It is intended to ensure that Closed Captioned/Subtitled High Definition program material, in accordance with the appropriate Australian and international standards will be successfully delivered to end users via the broadcasters’ storage and distribution processes. Additional to storage and distribution of subtitles, the operational practice describes the use of other ancillary data such as wide screen signaling (WSS) information via a multi-packet solution.
 
The legislated requirements of digital broadcasting in Australia have prompted an increase in the number of captioned programs. Legacy closed caption data is currently distributed as
World System Teletext subtitles in the vertical interval lines 21/334 of the SD bit serial video stream.
As TV networks’ distribution and recording/storage systems migrate to digital technology, appropriate technical and operational practices are required to ensure that program material which is produced in accordance with the internationally recognised standards is delivered successfully to the viewing audience via the broadcaster’s analogue and digital
transmissions. TV Logic broadcast monitors supporting OP-47 are available for immediate
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