Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Patent
1975-03-25
1977-01-11
Lucas, Jay P.
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
360 25, G11B 2736
Patent
active
040030849
ABSTRACT:
A tape record/playback system is tested by first deriving an analog test signal and a band-limited digital reference signal from a pseudo-noise (PN) sequence generator driven by a clock signal and recording said signals on respective tracks of the system during operation thereof in a record mode. During the playback mode of operation of the system, a delayed analog reference signal without time base variations is reconstructed from the played back reference signal and compared with the played back test signal in order to obtain an error signal that is a measure of the performance of the system.
REFERENCES:
patent: 2960686 (1960-11-01), Gaillard
patent: 3586965 (1971-06-01), Whysong
patent: 3755731 (1973-08-01), Young
patent: 3789377 (1974-01-01), Norris
Fletcher James C. Administrator of the National Aeronautics and Space
Gussow Sidney S.
Salter William E.
Wallace Gabriel R.
Weathers Glenn D.
Lucas Jay P.
Manning J. R.
Porter G. J.
Wofford, Jr. L. D.
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