| 摘要 |
Methods of evaluating performance of a video system and compensating for degradation of video signals caused by the video system are disclosed. A frequency sweep is passed through the video system that is being evaluated, causing the video system to output a degraded frequency sweep having amplitude variations. The degraded frequency sweep having amplitude variations is then passed through an amplitude peak level detector. The amplitude peak level detector outputs a low frequency signal with amplitude variations corresponding to the amplitude variations occurring in the degraded frequency sweep. This low frequency signal is then applied to a video display device allowing to evaluate performance of the video system by either brightness or colors of the images on the screen. A compensation means can be employed to compensate for the degradation. Since a low frequency signal is applied to a video display device, these methods permit the use of low grade and inexpensive monitors for evaluating performance of video systems designed to transmit high frequencies.
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