| 摘要 |
An instant television penalty flag alert system is provided which superimposes a video flag upon video images of sports events in progress, such as football or hockey. A plurality of spotters are equipped with transmitter which are activated whenever a predetermined event, such as a penalty call, is observed. A receiver detects the transmitted signal and superimposes the video flag which alerts the viewer that a penalty has been called. Transmitters may be frequency coded to identify the spotter to a control operator, and/or announcer, and/or the viewing audience. Alternatively, various modulation schemes, such as amplitude modulation, frequency modulation or pulse width modulation may be used. The actual position of the play may be transmitted using a transmitter with alpha-numeric input.
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