We present an add-on to cinema projectors that allows projecting subtitles or playing soundclips. These functions require precise timing information to keep both the video content and the added features synchronized. Although some digital projectors offer this timing information, our solution is compatible with all projectors worldwide. This allows cinema operators to offer additional features to their audience without moving to a new and expensive projector system. Our system is simply connected to the analog output of the projector. Based on a pre-computed image file and the live analog input, it calculates the timing through cross-correlation. The system is basically a standard PC and requires no dedicated DSP, instead it is based on “native” signal processing techniques on the CPU.
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