Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1988-03-21
1990-02-06
Stephan, Steven L.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7311, 360 7713, G11B 552
Patent
active
048992330
ABSTRACT:
This invention relates to DAT (Digital Audio Tape) equipment. On the magnetic tape, a multiple signal comprising a pulse code modulated sound data of a fixed period obtained by applying pulse code modulation to an audio signal, subcodes time-divisionally multiplexed before and after the pulse code modulated sound data by predetermined time periods, respectively, and a track finding signal is recorded. This recorded signal is allocated onto tracks formed in succession on the magnetic tape by the rotary head and is recorded in a first mode, or in a second mode where its data capacity per unit time is nearly one half of that in the first mode, and a revolving speed of the rotary head and a magnetic tape running speed are nearly one half of those in the first mode. ATF (Automatic Track Finding) signals are included in the recorded signal and are used for tracking control. A circuit arrangement for this ATF signal is provided, which permits only one of the plural kinds of ATF signals to be utilized so that an excellent reproduction can be performed even when the DAT equipment is switched from recording to reproducing mode. When the subcodes are subjected to over-write recording, tracking control is carried out by one ATF signal of the respective reproduced signals obtained by applying one scanning onto a recording track on the magnetic tape using the rotary head.
REFERENCES:
patent: 4651239 (1987-03-01), Omori et al.
patent: 4739420 (1988-04-01), Odaka et al.
Robertson David L.
Stephan Steven L.
Victor Company of Japan Ltd.
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