Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1994-01-26
1997-05-13
Young, W. R.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 67, G11B 15467, G11B 5584
Patent
active
056298145
ABSTRACT:
Automatic tracking control apparatus and method. The apparatus includes a low pass filter for detecting a pilot signal from a magnetic tape in a playback mode, an amplifier for amplifying the detected pilot signal at a varied gain, a reference pilot generator for generating reference pilot signals, a mixer for generating tracking control signals of 16 KHz and 46 KHz frequency components in accordance with differences between the respective reference pilot signals and the amplified pilot signal, first and second frequency detectors for detecting the tracking control signals of the 16 KHz and 46 KHz frequency components from output signals from the mixer, respectively, first and second level detectors for detecting levels of output signals from the first and second frequency detectors, respectively, a comparator for subtracting output levels from the first and second level detector from each other and outputting a tracking error signal in accordance with the subtracted result, and a microprocessor for generating a capstan motor control signal and a gain control signal in response to the tracking error signal from the comparator. Also, the microprocessor generates select signals for the generation of the reference pilot signals. The gain control signal is applied to the amplifier to vary the gain of the amplifier.
REFERENCES:
patent: 4594615 (1986-06-01), Nemoto et al.
patent: 4607297 (1986-08-01), Sonoda et al.
patent: 5251079 (1993-10-01), Yamada et al.
patent: 5359473 (1994-10-01), Kaniwa et al.
Goldstar Co. Ltd.
Habermehl James L.
Young W. R.
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