| 摘要 |
PURPOSE:To ensure an extremely stable operation without virtually using a resistance nor capacitor, by applying a digital signal processing system. CONSTITUTION:For a digital signal S obtained by quantizing the output of an A/D converter 8, i.e., a video signal into the binary value, 7-8 bits including video and color signals are required. Among these signals the horizontal and vertical synchronizing signal require 5-6 bits. Therefore a synchronism separating circuit 1 uses 5-6 bits among medium and upper bits of the signal S to obtain a synchronizing signal T. The signal T is applied to a phase wave detecting circuit 2 as the 1st input. While the output pulse E of a horizontal output circuit 6 is applied to a comparing signal generating circuit 7 (which performs integration with use of a digital LPF consisting of an adder/subtractor, a multiplier, etc.) to obtain a digital comparing signal (u) which is set at 0 at the center of the pulse E. The signal (u) is applied to the circuit 2 as the 2nd input. blocks 1-7 perform the function equal to the conventional technique. |
