Dynamic magnetic information storage or retrieval – Checking record characteristics or modifying recording...
Patent
1990-02-21
1991-07-30
Wolff, John H.
Dynamic magnetic information storage or retrieval
Checking record characteristics or modifying recording...
360 27, 360 362, 358 10, G11B 502, H04N 578, H04N 1702
Patent
active
050364065
ABSTRACT:
A standard reference video tape, a source of a standard reference video signal and a source of a variable offset signal are adapted for use with a plurality of time base corrector units. Each unit is capable of playing a video tape to produce a corresponding video output signal containing various viewing parameters such as video gain, chroma gain, set up and hue, the viewing parameters having values which can be varied. The units have slightly different electrical characteristics so that when each of these units is caused to play the same tape at identical parameter values, the video output signals will differ from unit to unit. The referene tape is played in one of the units having parameter values preset for use with this tape, thereby producing a video output signal containing all parameters. The output signal is played together with the reference signal, the reference signal containing the same parameters but with different values. An offset signal is applied to the input of said one 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, each value in the set being associated with a different parameter. Data which is monatonically related to the value of the set offset signal values producing said visual identity and uniquely identifying the unit with which this set is associated is obtained and stored in an offset memory.
REFERENCES:
patent: 4583134 (1986-04-01), Nakamichi
patent: 4706108 (1987-11-01), Kumagai et al.
Sadashige; "Overview of time-base connection techniques and their applications"; SMPTE; Journal vol. 85, No. 10, pp. 787-791; Oct. 76.
Sheladin Varsha V.
Wolff John H.
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