Television – Monitoring – testing – or measuring – Test signal generator
Patent
1996-06-26
1998-06-09
Kostak, Victor R.
Television
Monitoring, testing, or measuring
Test signal generator
348192, H04N 1700
Patent
active
057642842
ABSTRACT:
A system and method for measuring and evaluating video fidelity. A test video signal is transmitted over a baseline system under test (SUT). A reference video signal is delayed by an amount equal to a latency of the baseline SUT. The test video signal and the reference video signal were previously generated from a common source. The transmitted test video signal is synchronized with the delayed reference video signal, and the synchronized test video signal and the synchronized reference video signal are digitized. The digitized test video signal is inverted, and the digitized reference video signal and the inverted test video signal are summed to thereby generate a video fidelity value of the baseline SUT. A subjective determination is then made as to whether the transmitted test video signal is adequate. If the transmitted test video signal is adequate, then the video fidelity value of the baseline SUT as established as the baseline video fidelity value. Thereafter, the respective fidelities of other SUTs are evaluated with reference to the baseline video fidelity value.
REFERENCES:
patent: 4894718 (1990-01-01), Hung
patent: 4985901 (1991-01-01), Cohen et al.
patent: 5010403 (1991-04-01), Wardzala
patent: 5614944 (1997-03-01), Taura et al.
Kostak Victor R.
MCI Corporations
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