Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Patent
1986-11-12
1989-01-31
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
360 91, 360 27, H04N 578
Patent
active
048020249
ABSTRACT:
Video reproduction apparatus in which a plurality of parallel channels of frequency modulated video information signals reproduced from magnetic tape are automatically calibrated during demodulation to constrain each video information signal between the same peak to peak black and white analog signal range. The demodulator for each video channel includes a circuit for comparing demodulated white and black reference level signals at the beginning of the reproduced video signal with fixed white and black reference levels. White and black correction signals are produced which are representative of any differences between the reproduced and fixed reference level signals. The white and black correction signals are applied to the demodulator during demodulation of the video information signal to constrain the analog video signal between the fixed white and black reference levels. This results in a high degree of precision of peak-to-peak video information from channel to channel within a block and from block to block in a block sequential multichannel video signal. It also eliminates the need for manual calibration of each of a plurality of video demodulators, eliminates block to block intensity shifts of a displayed frame and permits interchangeability of tapes between different multitrack video reproduction apparatus.
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Eastman Kodak Company
Noval William F.
Psitos Aristotelis M.
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