| http://www.w3.org/ns/prov#value | - it including:means (11) for superimposing upon said video signal a further signal representing a display image portion, such as characters or symbols, to be superimposed on said picture; andcontrast enhancement inhibiting means (10) responsive to an inhibiting signal (Fig. 9(B)) synchronised with said further signal to selectively inhibit the varying of said scanning speed by said scanning speed v
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