Television – Monitoring – testing – or measuring
Patent
1997-10-01
2000-07-18
Flynn, Nathan
Television
Monitoring, testing, or measuring
348177, 348181, H04N 1700, H04N 1702
Patent
active
060914475
ABSTRACT:
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.
REFERENCES:
patent: 3978282 (1976-08-01), Fulton, Jr.
patent: 4028625 (1977-06-01), Behrend
patent: 5214500 (1993-05-01), Takayama et al.
patent: 5231489 (1993-07-01), Penney
Flynn Nathan
Khiterer Vladimir
Srivastava Vivek
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