| 摘要 |
<p>PURPOSE: To easily and exactly decide a priority order in the combination of plural video signal sources by inhibiting a related signal source for digitally supplying picture data, and deciding a priority order for transmission. CONSTITUTION: When an inhibition signal is supplied to input terminals 14, 24, 34, and 44, or when a signal from related signal sources 1, 2, 3, and 4 is used for transmission, the inhibition signal is supplied from output terminals 15, 25, 35, and 45. When the inhibition signal is present in the input terminals 14, 24, 34, and 44, the related signal sources 1-4 for digitally supplying picture data in a prescribed arbitrary correlative relation to a picture data clock signal are inhabited, and after the inhibition signal disappears, the related signal sources are turned into an operable state. In this case, a priority order for the transmission of the signal sources 1, 2, 3, and 4 is decided by access control circuits 13, 23, 33, and 43 having the input terminals 14, 24, 34, 44, and the output terminals 15, 25, 35, and 45 integrated into a chain circuit. Thus, the simple and reliable general control of the priority order in the combination of the plural video signal sources can be attained.</p> |
