Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Patent
1988-10-03
1990-01-02
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
360 65, G11B 2736, G11B 1514
Patent
active
048917168
ABSTRACT:
A data signal channel, such as a record/reproduce channel of a magnetic tape recorder, is automatically calibrated by means of multiple control signals which are applied to the channel simultaneously. The disclosed technique is fast, accurate, and effective in automatically calibrating a multispeed, multichannel, magnetic tape recorder in an optimum amount of time. A channel to be calibrated is stimulated with a complex wave-form having harmonic content at frequencies where reproduce amplifier equalization controls are effective. The channel response is measured and analyzed into the desired frequency components. A set of error values are determined by calculating the difference between the measured response values and known target response values at the desired frequencies. If the set of error values are not within allowable error limits, new control values are calculated from multiple control equations. The new control values are generated and sent to adjust the equalization controls. The process is reiterated until the calculated errors are within allowable limits for each of the desired frequency components.
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Canney Vincent P.
Datatape Incorporated
Noval William F.
LandOfFree
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