Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record
Patent
1987-02-03
1989-03-07
Wolff, John H.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the record
360 70, G11B 1546, G11B 1928
Patent
active
048111287
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.
REFERENCES:
patent: 4376268 (1983-03-01), Moriya et al.
patent: 4485337 (1984-11-01), Sandusky
patent: 4507592 (1985-03-01), Anderson
patent: 4607298 (1986-08-01), Yamashita
patent: 4626936 (1986-12-01), Yoshino
Hayami Atsushi
Hikawa Kazuo
Inoue Yasuo
Ono Fumiaki
Ono Tsuyoshi
Victor Company of Japan
Wolff John H.
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