| 摘要 |
The interface circuit for processing character multiplexing signal with an international caption spec. by using a teletext with a NABTS (North America Broadcasting Teletext Spec.) includes a signal detector (10) for detecting character multiplexing data superimposed in the vertical flyback period from video input signals, a signal generator (100) for generating a corresponding sync. signal according to the data type, and a signal processor (200) for processing the transmitted character multiplexing signal according to the sync. signal. The generator (10) comprises a parallel data converter (101), a frame code detector (102), a timing clock generator (103) and a byte clock generator (104).
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