Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1987-07-13
1989-12-26
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 18, 360 32, 360 7309, G11B 5584, G11B 509, G11B 15467
Patent
active
048901733
ABSTRACT:
A digital signal reproducing apparatus which reproduces digital PCM audio signals recorded on a recording medium in the form of single helical tracks. The apparatus is provided with at least two rotary heads for reproducing a plurality of signals on the recording medium. When there are variations in the performance of the rotary heads or in the conditions under which they are mounted on a drum, the apparatus is capable of performing control by a capstan servo in equal amounts for its heads based on the difference between the levels of crosstalk of pilot signals from the two tracks adjacent to the track being scanned (i.e., on-track) by the individual heads and without requiring any cumbersome adjusting operations if the heads are deviated in the same amounts with respect to the track being scanned. The adjustment of the levels of crosstalk is implemented using either a gain variable amplifier circuit or an analog divider circuit. In the amplifier circuit, as the on-track pilot signal increases, the gain of an amplifier decreases so that a smaller difference between the levels of crosstalk of pilot signals from the two adjacent tracks is produced. The analog divider circuit performs a division using the difference between the levels of crosstalk of the pilot signals of the two adjacent tracks used as a numerator and the output level of the pilot signal on the on-track used as a denominator.
REFERENCES:
patent: 4651239 (1987-03-01), Omori et al.
patent: 4656539 (1987-04-01), Sugiki et al.
patent: 4714971 (1987-12-01), Sigiki et al.
patent: 4739420 (1988-04-01), Odaka et al.
patent: 4748520 (1988-05-01), Odaka
patent: 4755893 (1988-07-01), Yamada et al.
Garland Steven R.
Pioneer Electronic Corporation
Psitos Aristotelis M.
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