| 摘要 |
A noise canceller for a video signal includes: a delay circuit 21, 22 for outputting a succeeding line video signal, a present line video signal and a preceding line video signal; a minimum value detector 32 which compares the succeeding line video signal with the present line video signal, and the present line video signal with the preceding line video signal, so as to output the lower-level minimum value; a maximum value selector 27 for comparing the minimum values so as to select the higher-level maximum value; a maximum value detector 33 which compares the succeeding line video signal with the present line video signal and the present line video signal with the preceding line video signal, so as to output the higher-level maximum value; a minimum value selector 28 for comparing the maximum values so as to select the lower-level minimum value; an adder 29 for summing the maximum value output from the maximum value selector 27 and the minimum value output from the minimum value selector 28 so as to output a signal containing correlation noise; and a subtracter 30 for subtracting the present line video signal from the summed signal from the adder 29 so as to output a video signal without noise. <IMAGE> |
