Method and apparatus for obtaining identical output signals from

Details Method and apparatus for obtaining identical output signals from Method and apparatus for obtaining identical output signals from

1990-02-21

1993-01-26

Young, Wayne R.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358327, 360 25, 360 362, H04N 989

Patent

active

051826542

ABSTRACT:
A set of offset signal values is obtained for use with a time base corrector unit which is capable of playing a video tape to produce a corresponding output video signal containing various viewing parameters such as video gain, chroma gain, set up and hue. A tape having a known set of parameter values and carrying test patterns is used together with a source of a standard reference video signal, and a source of a variable offset signal. The viewing parameter settings of the unit are adjusted to conform to the known set of parameter values. The tape is played in the unit, thus displaying the test pattern video output signal. The output signal is displayed with the reference signal, the reference signal containing the same parameters but with different values. An offset signal is applied to the input of the unit. The offset signal is varied to vary the video output signal for each parameter in turn until each parameter of the varied output signal is visually identical to that of the standard reference signal, thereby obtaining a set of offset signal values associated with the unit, each value in the set being associated with a different parameter.

REFERENCES:
patent: 4583134 (1986-04-01), Nakamichi
patent: 4706108 (1987-11-01), Kumagai et al.
patent: 5036406 (1991-07-01), Sanders

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