| 摘要 |
PURPOSE:To vary automatically an output luminance level by a simple circuit constitution, and to make a character easily visible by shifting a parallel luminance signal of (n) bits by 1 bit, based on a Y<+> signal. CONSTITUTION:A composite signal which has been received and detected is supplied to a chrominance signal processing circuit 5 and a luminance signal processing circuit 6, through an A/D conversion circuit 4. A luminance signal of (n) bits which has been processed by the circuit 6 is sent to a Y<+> signal processing circuit 7, D/A-converted 9 and applied to a matrix circuit 10. The processing circuit 7 is provided with an input memory, a digital switch, and an output memory, and in a period in which a Y<+> signal is generated, a parallel luminance signal of (n) bits is shifted by 1 bit, based on the Y<+> signal. In this way, a 1/2 luminance level can be obtained automatically, and a character of a super time can be made easily visible. |
