Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1976-04-15
1977-10-25
Wolff, John H.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
1791003V, 360121, G11B 526
Patent
active
040558495
ABSTRACT:
Magnetic head positioning and playback apparatus is provided for use with a helical scan tape recorder to accurately position a playback head with respect to a magnetic track. The playback head has a split face portion dividing the playback gap substantially in half. Reproduce signals from the corresponding portions are simultaneously processed to provide an indication of positional error and summed to provide a playback signal. In one form, by differencing the reproduce signals from the corresponding portions and by multiplying the difference and sum signals together, a usable correction signal is provided to a servo circuit for simultaneously centering the head on the track while reproducing a playback signal -- this being accomplished without the use of a separate control track. By further comparing the correction signal with a reference level, momentary disturbances in the track are detected as they occur; this information is used to determine which portion of the head provided the disturbance and to prevent that portion's signal from summing into the playback signal.
REFERENCES:
patent: 3246307 (1966-04-01), Stanley
patent: 3541270 (1970-11-01), Walther
patent: 3829622 (1974-08-01), Elliot
patent: 3918091 (1975-11-01), Walraven
Cody Robert F.
Eastman Kodak Company
Wolff John H.
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