DTS requires a timecode track to be present on the film, which synchronises the audio disk to the film. This synchronisation is not required on Dolby films, as the audio data is present on the film itself. Consequently, our research has not discovered a device which can consistently read the Dolby Digital data and convert it to timecode suitable for synchronising an outboard device. We are continuing to research other alternatives, such as the possibility of generating timecodes referenced to a count of sprocket holes passing through a film projector. If it can only access one type, use of the system will be restricted.
Most theatres have a mix of the two sound systems to cope with the range of movies that they show.
The captioning systems in use are for a single theatre. A typical Australian cinema complex, the Greater Union in Innaloo has theatres ranging from 97-520 people. Most theatres seat 250-330 people. The impact of this is the method by which the captions are transmitted to the viewer, which can be restricted by distance and the number of viewing units that are required to adequately service a theatre. 3.3 Speed of release and number of prints Release time is dependent on the Australian marketing plan.