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:
Mar. 07, 1989
Filed:
Feb. 03, 1987
Tsuyoshi Ono, Yamato, JP;
Yasuhiro Yamada, Fussa, JP;
Kazuo Hikawa, Mitaka, JP;
Atsushi Hayami, Yamato, JP;
Yasuo Inoue, Kawasaki, JP;
Fumiaki Ono, Fujisawa, JP;
Victor Company of Japan, Yokohama, JP;
Abstract
A digital signal recording and reproducing apparatus comprises rotary magnetic heads for recording and reproducing digital signals on and from a magnetic tape, where the digital signals include a digitally modulated information signal and a specific signal which is in a frequency region different from that of the digitally modulated information signal, a circuit for frequency-selecting the specific signal from the reproduced digital signals, a circuit for measuring a period of the specific signal which is frequency-selected, a circuit for calculating a rate of change of a transmission rate of the reproduced digital signals from the measured period of the specific signal and for detecting a relative linear velocity between the rotary magnetic head and the magnetic tape.