| 摘要 |
<p>The present invention discloses a noise measurement method and system in a television signal receiver. The receiver has a noise reduction circuit and receives a composite television picture signal which contains noise, picture information, a trigger pulse (preferably the Vsync pulse), a horizontal synchronizing pulse and a standard signal adjacent in time to and later than the horizontal synchronizing pulse. The preferred standard signal is a back porch signal or a color burst signal. A comparator (20,22) receives at least two samples of the standard signal and produces a comparison signal that is representative of the comparison of the two standard signal samples. Preferably the two standard signal samples are from two different scan lines. An accumulator circuit (27) receives the comparison signal and generates a measured noise signal that is used to control the noise reduction circuit.</p> |
