Patent ID: 6091447
Filing Date: 2000-07-18
Classification: H04N

Abstract:
A method of evaluating performance of a video system comprising the steps of:(a) generating a frequency sweep comprising a signal comprising a sinewave of a continuously variable frequency such that the frequency range of said frequency sweep comprises at least one frequency expected to be transmitted by the video system;(b) placing said frequency sweep in communication with an input of the video system;(c) passing said frequency sweep through the video system thereby causing the video system to output a degraded frequency sweep having amplitude variations;(d) placing said degraded frequency sweep in communication with a means of detecting amplitude peak levels;(e) passing said degraded frequency sweep through the means of detecting amplitude peak levels thereby causing said means of detecting amplitude peak levels to output a low frequency signal having amplitude variations corresponding to the amplitude variations occurring in said degraded frequency sweep;(f) placing said low frequency signal in communication with a means of visual representation of video signals;(g) causing said means of visual representation of video signals to display visual representations of said degraded frequency sweep in a way that the visual representations of said degraded frequency sweep are presented separate from each other and each representation is not altered by the visual representation of any other signal, and brightness of each visual representation corresponds to the amplitude variation occurring in said degraded frequency sweep;(h) evaluating performance of the video system by observing the brightness of the visual representations of said degraded frequency sweep.