When using a Cavena transmission system to playout subtitles from files, synchronized to video using time code, it is very easy to change the transmission formats.
Converting, or simply adding, HD subtitling can be done using only configuration changes and only add hardware if required by the signal formats. For example, if the time code feed is changed from SD to HD, a timecode reader board supporting HD signals must be used. If transmitting in-vision subtitles, an HD compatible inserter must be installed if not present. For DVB transmissions, changing to HD requires only configuration changes. No changes are required to the subtitle files, the same files can be used for any transmission format.