Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Patent
1983-04-15
1984-10-30
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
360 18, G11B 2736, G11B 1502
Patent
active
044802749
ABSTRACT:
A method and apparatus are disclosed for enabling the continuous monitoring of recording circuit performance and the automatic optimization of the recording process in a rotary head recorder having a plurality of recording heads. A calibration signal is recorded by each recording head onto the overlap area of a moving magnetic tape medium. A fixed monitor head subsequently detects components of the recorded signal, the magnitudes of which are squared and retained in sample and hold units. The sampled and held values are periodically used to construct an outputted value commensurate with recording circuit performance. Optimization is accomplished by varying the recording drive level of a recording head about a predetermined point during a series of successive overlap periods. A DC error voltage is derived from the respective outputs resulting from such variation, and used to shift the recording drive level of that head towards a point of optimum playback output.
REFERENCES:
patent: 4263625 (1981-04-01), Warren
patent: 4413288 (1983-11-01), Hurst
Ampex Corporation
Canney Vincent P.
Strnad Elizabeth E.
Talcott Joel D.
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