| Ghost-canceling Reference |
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| television technology | |
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In the United States , the GCR signal is a Chirp in Frequency of the Modulating Signal from 0 Hz to 4.2 MHz, transmitted during the Vertical Blanking Interval over one video line, shifted in phase by 180° once per frame. Television receivers generate their own local versions of this signal, and use the comparison between the local and remote signals to tune out any ghost images on the screen. GCR was introduced after its recommendation in 1993 by the Advanced Television Systems Committee. {Link without Title} |
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