The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 31, 1993
Filed:
May. 08, 1991
Kaneyuki Okamoto, Katsuta, JP;
Hideo Nishijima, Katsuta, JP;
Yoshiaki Umehara, Katsuta, JP;
Yuji Inaba, Katsuta, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The specification discloses a magnetic recording signal reproducing apparatus for controlling a magnetic tape and reproducing magnetic heads. In the magnetic recording signal reproducing apparatus of the invention, a magnetic tape which is moved for magnetic heads attached to a rotary cylinder is traced by the magnetic heads and signals recorded on tracks of the magnetic tape are reproduced. A construction of the apparatus includes a tracking control system, a tape tension control system, and an apparatus for selectively switching operations of both of the control systems. The tracking control system includes: an apparatus, attached to the rotary cylinder, for moving the magnetic heads in the width direction of the tracks in accordance with a tracking signal; and an apparatus for sampling the signals detected by the magnetic heads, for comparing a preceding sampled value with a present sampled value, and for generating the tracking signal such that the present sampled value is larger than the preceding sampled value. The tape tension control system includes: an apparatus for detecting changes per predetermined time in levels of the signals detected by the magnetic head; an apparatus for giving a tension to the moving magnetic tape and for adjusting the tension in accordance with a tension control signal; and an apparatus for generating the tension control signal to adjust the tension according to change amounts per predetermined time of the signal levels to a reference value. Further, the switching apparatus includes switching means for receiving the signals detected by the magnetic heads and for selectively energizing either one of the tracking control system and the tape tension control system in accordance with the levels of the signals. Another magnetic recording signal reproducing apparatus according to the invention comprises: two magnetic heads arranged to a cylinder so as to simultaneously trace adjacent tracks; an apparatus, attached to the cylinder, for individually moving the two magnetic heads in the width direction of the tracks in accordance with a head position control signal; and an apparatus for generating the head position control signal to move the magnetic heads in the width direction of the tracks in a manner such that when the recorded signals are reproduced at a speed different from a tape moving speed upon recording, amplitude levels of the reproduction signals detected by the two magnetic heads locating at predetermined track positions have a relation of opposite phases.