| 摘要 |
A high-definition camera uses sinuous scanning to produce wide-bandwidth signals having high definition in the horizontal direction as well as in the vertical direction. A lowpass filter produces a limited-bandwidth signal from the wideband signal. The limited-bandwidth signal is compatible with standard television broadcast systems and receivers. A subtracting circuit compares the wide-bandwidth and limited-bandwidth signals to produce a delta signal representative of the difference. The delta signal exists only in regions of fine detail which cannot be resolved by the limited-bandwidth signal. The delta signal and its address are transmitted to the receiver together with the limited-bandwidth signal. At the receiver, the high-definition image is recreated by operation of the delta signal on the limited-definition signal. The delta signal and its addresses may be transmitted during the vertical blanking interval. In order to reduce the data rate of the delta signal, its generation is inhibited in regions of the picture which exhibit frame-to-frame motion.
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